CN111353718B

CN111353718B - Wetland and water replenishing engineering environmental effect evaluation method and device based on SWMM and EFDC

Info

Publication number: CN111353718B
Application number: CN202010164113.0A
Authority: CN
Inventors: 杨中文; 陈焰; 夏瑞; 王璐; 张远; 马淑芹; 张凯; 后希康; 郝彩莲; 王晓; 贾蕊宁; 杨辰; 张晓娇
Original assignee: Chinese Research Academy of Environmental Sciences
Current assignee: Chinese Research Academy of Environmental Sciences
Priority date: 2020-03-10
Filing date: 2020-03-10
Publication date: 2022-08-30
Anticipated expiration: 2040-03-10
Also published as: CN111353718A

Abstract

The invention discloses a wetland and water replenishing engineering environmental effect evaluation method and device based on SWMM and EFDC, wherein the method comprises the following steps: acquiring first geographic data for representing the runoff of a pipe network of a research area, second geographic data for representing pipe network parameters of the research area, third geographic data for representing the distribution of a river channel of the research area and fourth geographic data for representing the hydrodynamic water quality of the river channel of the research area, and constructing a first coupling model of SWMM and EFDC before engineering implementation through the data; then acquiring design parameters of wetland and water replenishing engineering, water quality and water quantity data of a wetland water outlet and a water replenishing outlet before and after engineering implementation, wetland engineering investment data and water replenishing engineering investment data; and adjusting the EFDC model according to the data to respectively obtain an SWMM and EFDC second coupling model of the wetland engineering and an SWMM and EFDC third coupling model of the water supplementing engineering, and evaluating the environmental effects of the wetland engineering and the water supplementing engineering according to the data output by different coupling models.

Description

Wetland and water replenishing engineering environmental effect evaluation method and device based on SWMM and EFDC

Technical Field

The invention relates to the field of water environment treatment engineering, in particular to a wetland and water replenishing engineering environmental effect evaluation method and device based on SWMM and EFDC.

Background

Wetland engineering and water replenishing engineering are used as important engineering means for urban water environment treatment, and have irreplaceable effects on the aspect of water quality improvement. The wetland engineering is used for purifying rainfall runoff in the early stage and reducing the input of a surface source to a river channel, and can play a role of a sewage treatment plant for treating river water, the river water is lifted to the wetland, and the treated river water is discharged into the river channel according to the wetland treatment discharge standard; the water replenishing engineering adopts high-quality water to dilute poor-quality water, a water replenishing water source is generally standard tail water of a sewage treatment plant, and the tail water of the sewage treatment plant is discharged to a river channel by building a pipe network and a lifting pump station, so that the ecological flow of the river channel is increased while the water quality of the river channel is improved. Before the engineering is implemented, the wetland treatment scale and treatment standard are designed based on water quality improvement, the water replenishing quantity and the water replenishing port design parameters and quantity are determined, and the pollutant concentration change, the pollution load reduction amount and the like before and after the implementation of the quantitative engineering have certain reference values for establishing an engineering implementation scheme and engineering cost. Meanwhile, how to evaluate the influence of some natural factors (rainfall and the like) on the water quality of the evaluation section is also the main content of the engineering implementation scheme, so that the environmental effect evaluation of wetland and water replenishing engineering needs to be carried out, and technical support is provided for the establishment of the engineering implementation scheme.

At present, the environmental effect evaluation methods used for wetland and water replenishing engineering mainly comprise: the method comprises the following steps of after-effect evaluation based on measured data, pollution emission reduction effect evaluation based on pollution load coefficient calculation, river channel water environment numerical simulation evaluation and the like. The post-effect evaluation method based on data analysis mainly evaluates the effect of engineering operation by analyzing the water quality change degree after the engineering is implemented, but the method mainly depends on the actual measurement data after the actual operation of the engineering, cannot pre-judge the effect after the engineering is built and operated in the engineering planning period, and has a great limitation on guiding the formulation of the early-stage engineering planning scheme. The pollution emission reduction effect evaluation method based on load calculation mainly analyzes the emission reduction effect after the engineering is implemented based on the angle of total pollutant amount control, but does not consider the response relation between pollution emission reduction and water quality, can not scientifically evaluate the water environment quality improvement effect after the engineering design scheme (design parameters such as position, scale and the like) is implemented, and is difficult to provide technical support for the formulation of a treatment engineering scheme taking a water quality target as a core. The improvement effect of the water environment is simulated and analyzed by taking hydrodynamic water quality model simulation of the urban riverway as a means and river water quality change before and after engineering implementation as boundary conditions, but the method only considers the pollution emission and the water environment response process in the riverway and does not fully consider the influence of the rainfall runoff process under different season conditions, and the influence of the source rainfall runoff pollution input outside the riverway on the water environment improvement effect is not fully considered.

In the above evaluation methods, the factors for reference in the evaluation process are one-sided, the influence of urban non-point source pollution input on the water environment is not considered, and the influence of the engineering position, scale and the like on the environment effect of the wetland and water replenishing engineering is not considered, so that the evaluation result is easy to be inaccurate.

Disclosure of Invention

In view of the above, in order to overcome the defect that the evaluation result of the wetland and water replenishing engineering environmental effect evaluation method in the prior art is inaccurate, the embodiment of the invention provides a wetland and water replenishing engineering environmental effect evaluation method and device based on SWMM and EFDC.

According to a first aspect, an embodiment of the present invention provides a wetland and water replenishment engineering environmental effect evaluation method based on SWMM and EFDC, including: acquiring first geographic data used for representing pipe network runoff of a research area, second geographic data used for representing pipe network parameters of the research area, third geographic data used for representing river channel distribution of the research area and fourth geographic data used for representing hydrodynamic water quality of river channels of the research area; constructing a first coupling model of SWMM and EFDC according to the first geographical data, the second geographical data, the third geographical data and the fourth geographical data to obtain first output data of water quality and water quantity before the implementation of wetland and water replenishing projects; acquiring design parameters of wetland and water replenishing engineering, water quality and water quantity data of a wetland water outlet and a water replenishing port before and after engineering implementation, wetland engineering investment data and water replenishing engineering investment data; adjusting the EFDC model according to the design parameters of the wetland engineering and the water quality and water quantity data of the wetland water outlet before and after the engineering is implemented to obtain a first EFDC model; constructing a SWMM and EFDC second coupling model according to the first EFDC model to obtain second output data of water quality and water quantity after the wetland engineering is implemented; adjusting the EFDC model according to the water quality and water quantity data of the water replenishing port before and after the project is implemented according to the design parameters of the water replenishing project to obtain a second EFDC model; constructing a third coupling model of SWMM and EFDC according to the second EFDC model to obtain third output data of water quality and water quantity after the water supplementing project is implemented; and evaluating the environmental effects of the wetland engineering and the water supplementing engineering according to the first output data, the second output data, the third output data, the investment data of the wetland engineering and the investment data of the water supplementing engineering.

Optionally, according to design parameters of wetland engineering, adjusting the EFDC model according to data of water quality and water quantity of the wetland water-returning opening before and after the engineering is implemented to obtain a first EFDC model, including: the method comprises the following steps of (1) enabling wetland engineering as nodes to enter an EFDC model in a generalized manner according to design parameters of the wetland engineering; and setting boundary conditions of the wetland engineering according to the water quality and water quantity data of the wetland water outlet before and after the engineering is implemented to obtain a first EFDC model.

Optionally, according to design parameters of a water supplementing project, adjusting the EFDC model according to water quality and water quantity data of the water supplementing port before and after the project is implemented to obtain a second EFDC model, including: the water supplementing project is taken as a node to enter an EFDC model in a generalized mode according to design parameters of the water supplementing project; and setting boundary conditions of the water supplementing project according to the water quality and water quantity data of the water supplementing port before and after the project is implemented to obtain a second EFDC model.

Optionally, the evaluating the environmental effects of the wetland engineering and the water replenishing engineering according to the first output data, the second output data, the third output data, the wetland engineering investment data and the water replenishing engineering investment data includes: obtaining a first water quality index concentration and a first water quantity of a section to be examined according to the first output data and a preset water quality index, wherein the section to be examined is a downstream outlet section of a river channel in a research area, a key focus section or a water quality assessment section; obtaining a second water quality index concentration, a second water quantity, a first water quality index standard time and a first water quality index simulation total time of the section to be examined according to the second output data and a preset water quality index; obtaining a third water quality index concentration, a third water quantity, a second water quality index standard time and a second water quality index simulation total time of the section to be examined according to the third output data and a preset water quality index; calculating a first water quality concentration change rate, a first load flux variable quantity, a first standard-reaching rate and a first cost-efficiency ratio based on water quality according to the first water quality index concentration, the first water quantity, the second water quality index concentration, the second water quantity, the first water quality index standard-reaching days, the first water quality index simulation total days and water supplementing engineering investment data; calculating a second water quality concentration change rate, a second load flux change quantity, a second standard-reaching rate and a second cost-efficiency ratio based on the water quality according to the first water quality index concentration, the first water quantity, the third water quality index concentration, the third water quantity, the second water quality index standard-reaching days, the second water quality index simulation total days and the water supplementing engineering investment data; evaluating the environmental effect of the wetland engineering according to the first water quality concentration change rate, the first load flux change amount, the first standard reaching rate and the first cost-effectiveness ratio based on the water quality; and evaluating the environmental effect of the water supplementing project according to the second water quality concentration change rate, the second load flux change quantity, the second standard reaching rate and the second cost-effectiveness ratio based on the water quality.

Optionally, the water quality concentration change rate, the load flux change amount, the standard reaching rate and the water quality-based cost-effectiveness ratio are calculated by the following formulas:

water concentration change rate k:

load flux variation W: w ═ C _t *Q _t -C ₀ *Q ₀

Standard reaching rate S:

cost-to-benefit ratio based on water quality R:

wherein: k represents the rate of change of water concentration, C ₀ 、C _t Respectively representing the water quality index concentration (mg/l) before and after the engineering; w represents the amount of change in load flux, Q ₀ 、Q _t Respectively representing the water quantities (m) before and after the project ³ S); s represents the achievement rate, D _s 、D _T The number of days for reaching the water quality index standard and the total number of simulated days (day) after the engineering are expressed; r represents the cost-to-efficiency ratio based on water quality, and M represents the engineering investment (ten thousand yuan).

Optionally, constructing the SWMM and EFDC first coupling model according to the first geographical data, the second geographical data, the third geographical data, and the fourth geographical data includes: constructing an SWMM model according to the first geographic data; obtaining output data of the runoff water quality and the water quantity of the pipe network of the research area according to the second geographic data and the SWMM model; constructing an EFDC model according to the third geographic data and the fourth geographic data; and coupling the SWMM model and the EFDC model according to the output data of the runoff water quality and the water quantity of the pipe network of the research area to generate a first coupling model of SWMM and EFDC.

According to a second aspect, an embodiment of the present invention provides a wetland and water replenishing engineering environmental effect evaluation device based on SWMM and EFDC, including: the system comprises a first acquisition unit, a second acquisition unit and a third acquisition unit, wherein the first acquisition unit is used for acquiring first geographic data for representing the runoff of a pipe network of a research area, second geographic data for representing pipe network parameters of the research area, third geographic data for representing the distribution of a river channel of the research area and fourth geographic data for representing the hydrodynamic water quality of the river channel of the research area; the first construction unit is used for constructing a SWMM and EFDC first coupling model according to the first geographic data, the second geographic data, the third geographic data and the fourth geographic data to obtain first output data of water quality and water quantity before the implementation of wetland and water replenishing projects; the second acquisition unit is used for acquiring design parameters of the wetland and the water replenishing engineering, water quality and water quantity data of a wetland water outlet and a water replenishing outlet before and after the engineering is implemented, and wetland engineering investment data and water replenishing engineering investment data; the first adjusting unit is used for adjusting the EFDC model according to the design parameters of the wetland engineering and the water quality and water quantity data of the wetland water outlet before and after the engineering is implemented to obtain a first EFDC model; the second construction unit is used for constructing a SWMM and EFDC second coupling model according to the first EFDC model to obtain second output data of water quality and water quantity after the wetland engineering is implemented; the second adjusting unit is used for modifying the EFDC model according to the design parameters of the water supplementing project and the water quality and water quantity data of the water supplementing port before and after the project is implemented to obtain a second EFDC model; the third construction unit is used for constructing a SWMM and EFDC third coupling model according to the second EFDC model to obtain third output data of water quality and water quantity after the water replenishing engineering is implemented; and the evaluation unit is used for evaluating the environmental effects of the wetland engineering and the water replenishing engineering according to the first output data, the second output data, the third output data, the investment data of the wetland engineering and the investment data of the water replenishing engineering.

According to a third aspect, an embodiment of the present invention provides a computer device, including: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by one processor, and the instructions are executed by at least one processor to enable the at least one processor to execute the SWMM and EFDC-based wetland and moisturizing engineering environmental effect evaluation method in the first aspect or any embodiment of the first aspect.

According to a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where computer instructions are stored, and the computer instructions are configured to enable a computer to execute the SWMM and EFDC-based wetland and moisturizing engineering environmental effect evaluation method in the first aspect or any implementation manner of the first aspect.

The embodiment of the invention provides a wetland and water replenishing engineering environmental effect evaluation method and a device based on SWMM and EFDC, which are characterized in that a network management hydrological model (SWMM) is embedded in a traditional riverway hydrodynamic water quality model (EFDC) to form a SWMM and EFDC coupling model, the wetland and water replenishing engineering environmental effect is evaluated, as the SWMM model takes urban rainfall runoff (urban area source pollution) into consideration, the SWMM and EFDC coupling model comprehensively takes the integrity and systematicness of a basin into consideration, conditions such as terrain, a pipe network, hydrology, meteorology and water quality are considered, when the wetland and water replenishing engineering environmental effect is evaluated through the SWMM and EFDC coupling model, the influence of the area source pollution generated by the rainfall runoff on the water quality section reaching the standard can be simulated and analyzed, and when the wetland and water replenishing engineering are generalized to enter the EFDC model, the engineering design parameters (position, quantity, scale, standard and the like) are digitalized and generalized to the EFDC model, therefore, the influence of the engineering design parameters on the wetland and water replenishing engineering environmental effects is considered, the evaluation on the wetland and water replenishing engineering environmental effects is more accurate, and a key technical support is provided for quantitatively simulating and analyzing the water environment influence implemented by engineering.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 shows a flow chart diagram illustrating a wetland and water replenishing engineering environmental effect evaluation method based on SWMM and EFDC according to an embodiment of the invention;

FIG. 2 shows a schematic diagram of wetland and moisturizing engineering model generalization according to an embodiment of the invention;

FIG. 3 shows a schematic diagram of wetland and water replenishing projects in an EFDC grid according to an embodiment of the invention;

FIG. 4 shows water system and land use profiles for an exemplary embodiment of the present invention;

FIG. 5 illustrates a case zone element point bitmap, according to an embodiment of the present invention;

FIG. 6 shows a point diagram of wetland engineering and water replenishment engineering in a case zone according to an embodiment of the present invention;

FIG. 7 illustrates a case zone DEM digital elevation map of an embodiment of the present invention;

fig. 8 shows a schematic large-section view of a case-zone portion of a river terrain in accordance with an embodiment of the invention;

FIG. 9 illustrates a case zone rainfall station rainfall daily scale histogram of an embodiment of the present invention;

fig. 10 shows a schematic of a case zone SWMM model skeleton of an embodiment of the present invention;

FIG. 11 illustrates case zone first coupling model traffic rating results for an embodiment of the present invention;

FIG. 12 shows the water quality calibration results of the first coupling model in the case zone according to the embodiment of the present invention;

fig. 13 shows a case area wetland and moisturizing project grid distribution diagram in an embodiment of the invention;

FIG. 14 shows a trend chart of COD concentration variation of the examined section under wetland treatment conditions according to the embodiment of the invention;

FIG. 15 shows a trend chart of COD concentration variation of the examination section under the water replenishing condition of the embodiment of the invention;

FIG. 16 is a schematic structural diagram of a wetland and water replenishment engineering environmental effect evaluation device based on SWMM and EFDC according to an embodiment of the invention;

fig. 17 is a schematic diagram showing a hardware configuration of a computer device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element such as a layer, region or substrate is referred to as being "on" or extending "onto" another element, it can be directly on or extend directly onto the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or extending "directly onto" another element, there are no intervening elements present. Also, it will be understood that when an element (e.g., a layer, region or substrate) is referred to as being "on" or extending "over" another element, it can be directly on or extend directly over the other element, or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or extending "directly over" another element, there are no intervening elements present. It will also be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.

Relative terms (e.g., "below …" or "above …" or "upper" or "lower" or "horizontal" or "vertical") may be used herein to describe one element, layer or region's relationship to another element, layer or region as illustrated in the figures. It will be understood that these terms and those discussed above are intended to encompass different orientations of the device in addition to the orientation depicted in the figures.

The embodiment of the invention provides a wetland and water replenishing engineering environmental effect evaluation method based on SWMM and EFDC, as shown in figure 1, comprising the following steps:

s101, obtaining first geographic data used for representing the runoff of a pipe network of a research area, second geographic data used for representing pipe network parameters of the research area, third geographic data used for representing the distribution of a river channel of the research area and fourth geographic data used for representing the hydrodynamic water quality of the river channel of the research area.

Specifically, the first geographic data for characterizing pipe network runoff in the research area comprise: the system comprises a research area range boundary, Digital Elevation Model (DEM) data, a rainfall station coordinate position, an evaporation station coordinate position, land utilization data, soil type data, a river channel assessment section position and the like. The second geographic data characterizing the parameters of the pipe network of the study area include: the rainfall and the corresponding observation time sequence, the evaporation capacity and the corresponding observation time sequence monitored by the meteorological station. Third geographic data characterizing the river course distribution of the study area includes: water system distribution of a research area, the position of a hydrological station of the research area, the position of a water quality monitoring station, river terrain data and the like. The fourth geographical data characterizing the hydrodynamic water quality of the riverway at the research area comprises: the fourth geographic data includes: the method comprises the steps of studying area sewage treatment plant position, sewage discharge flow and sewage discharge concentration, studying area sewage discharge outlet position, sewage discharge flow and sewage discharge concentration, studying area river hydrology station historical monitoring or river inflow water flow sequence data monitored on site and studying area river inflow water background concentration sequence data monitored on historical monitoring or site of a water quality monitoring station.

S102, constructing a SWMM and EFDC first coupling model according to the first geographic data, the second geographic data, the third geographic data and the fourth geographic data to obtain first output data of water quality and water quantity before implementation of wetland and water replenishing projects; specifically, the swmm (storm water management model) model is a storm flood management model. The EFDC (the Environmental Fluid Dynamics code) model is an Environmental Fluid Dynamics model. The SWMM model can be built by adopting the first geographic data, the EFDC model is built by adopting the third geographic data and the fourth geographic data, the SWMM model is calibrated by adopting the second geographic data as a drive, the output data of the SWMM model is used as the drive of the EFDC model, the coupling of the SWMM model and the EFDC model is completed, and the first coupling model of the SWMM and the EFDC is generated. After the first coupling model of the SWMM and the EFDC is generated, the model automatically outputs first output data, wherein the first output data comprises water quality and water quantity data which change along with time.

S103, acquiring design parameters of the wetland and the water replenishing project, water quality and water quantity data of a wetland water outlet and a water replenishing outlet before and after the project is implemented, and investment data of the wetland project and investment data of the water replenishing project; in particular, wetland engineering is a common engineering measure for water environment treatment, is generally built along a river, plays a role of a sewage treatment plant, is used for treating initial rainwater or river water, and is discharged into a nearby river channel after the treatment reaches the standard. The water replenishing engineering generally discharges tail water of a sewage plant to a corresponding position of a river channel by laying a pipe network to achieve the effect of diluting a water body, and directly generalizes a water replenishing port to the river channel without considering the laying of the pipe network in a model. The design parameters of the wetland engineering and the water replenishing engineering comprise: location, quantity, scale, standard, etc. The wetland engineering is explained by taking a wetland water-reducing port and a water-replenishing engineering as an example. The water quantity of the wetland water outlet and the water replenishing port before the engineering is implemented is zero. The water quality of the wetland water return port before the engineering is implemented is set according to the treatment standard, and the water quality of the water replenishing port is set according to the discharge standard of a sewage plant. The water quality and the water quantity of the wetland water return port and the wetland water supply port after the engineering is implemented are set according to the specific engineering plan.

S104, adjusting an EFDC model according to the design parameters of the wetland engineering and the water quality and water quantity data of the wetland water outlet before and after the engineering is implemented to obtain a first EFDC model; specifically, the wetland engineering is mainly generalized by the EFDC module, and the generalized wetland engineering method adjusted according to actual conditions is shown in fig. 2.

S105, constructing a SWMM and EFDC second coupling model according to the first EFDC model to obtain second output data of water quality and water quantity after the implementation of the wetland engineering; specifically, the SWMM model and the first EDFC model are coupled again, and second output data of the water quality and the water quantity changing along with time after the wetland engineering is implemented can be obtained.

S106, adjusting the EFDC model according to the water quality and water quantity data of the water replenishing port before and after the engineering implementation according to the design parameters of the water replenishing engineering to obtain a second EFDC model; specifically, the generalization of the water replenishing project is mainly realized in the EFDC module, and the generalized manner of the water replenishing project adjusted according to the actual situation is shown in fig. 2.

S107, constructing a SWMM and EFDC third coupling model according to the second EFDC model to obtain third output data of water quality and water quantity after water replenishing engineering is implemented; specifically, the SWMM model and the second EDFC model are coupled again, and third output data of the water quality and the water quantity changing along with time after the wetland engineering is implemented can be obtained.

And S108, evaluating the environmental effects of the wetland engineering and the water replenishing engineering according to the first output data, the second output data, the third output data, the investment data of the wetland engineering and the investment data of the water replenishing engineering. Specifically, the environmental effect of the wetland engineering can be evaluated according to the first output data, the second output data and the wetland engineering investment data. And according to the first output data, the third output data and the water supplementing project investment data, the environmental effect of the water supplementing project can be evaluated.

The wet land and water supply engineering environmental effect evaluation method based on SWMM and EFDC provided by the embodiment of the invention is characterized in that a network management hydrological model (SWMM) is embedded in a traditional riverway hydrodynamic water quality model (EFDC) to form a SWMM and EFDC coupling model, the wet land and water supply engineering environmental effect is evaluated, as the SWMM model takes urban rainfall runoff (urban area source pollution) into consideration, the SWMM and EFDC coupling model comprehensively takes the integrity and systematicness of a river basin into consideration, and takes the conditions of terrain, a pipe network, hydrology, meteorology, water quality and the like into consideration, when the wet land and water supply engineering environmental effect is evaluated through the SWMM and EFDC coupling model, the influence of the area source pollution generated by the rainfall runoff on the water quality section reaching the standard can be comprehensively simulated and analyzed, and when the wet land and water supply engineering are generalized to enter the EFDC model, the design parameters (position, number, scale, standard and the like) of the engineering are numerically converted into the EFDC model, therefore, the influence of the engineering design parameters on the environmental effects of the wetland and water replenishing engineering is considered, the evaluation on the environmental effects of the wetland and water replenishing engineering is more accurate, and a key technical support is provided for quantitatively simulating and analyzing the environmental effects of the engineering implementation.

In an optional embodiment, in step S104, the adjusting the EFDC model according to the design parameters of the wetland engineering and the water quality and quantity data of the wetland water-returning port before and after the engineering implementation to obtain the first EFDC model includes: performing generalization on the wetland engineering as nodes to enter an EFDC model according to design parameters of the wetland engineering; and setting boundary conditions of the wetland engineering according to the water quality and water quantity data of the wetland water outlet before and after the engineering is implemented to obtain a first EFDC model. Specifically, point sources such as a wetland, a sewage outlet, a sewage treatment plant and the like and an SWMM outlet are input into the EFDC grid together; fig. 3 shows an exemplary diagram of the positions of wetlands, drains, sewage plants, SWMM outlets, EFDC outlets and their coordinate inputs in the EFDC grid. Before and after the construction of wetland engineering, the same as the treatment mode of point sources such as a sewage draining outlet and a sewage plant, a wetland water outlet needing to be edited is selected from the model, corresponding water quantity and water quality are input (Q, C), the setting form of Q and C can be a constant value or a dynamic time sequence value, and the wetland water outlet is set according to the constant value in the embodiment. Taking the wetland water-reducing ports in the grid of fig. 3 as an example, as shown in table 1, the boundary water amount of each wetland engineering is 0 before the wetland engineering construction, and the water quality is referred to the wetland treatment standard. After the wetland engineering construction, the water amount and the water quality corresponding to the wetland water-returning opening are respectively input according to the engineering plan as shown in the table 2.

TABLE 1

Categories	Form(s) of	Time	Amount of water (m3/d)	Water quality COD (mg/l)
					Wetland W1	Constant value	All year round	0	Processing criteria
Wetland W2	Constant value	All year round	0	Processing criteria
					Water supplement D1	Constant value	All year round	0	Discharge standard of sewage plant
Water supplement D2	Constant value	All year round	0	Discharge standard of sewage plant
					Water supplement D3	Constant value	All year round	0	Discharge standard of sewage plant

TABLE 2

In the embodiment of the invention, as the wetland engineering treatment river water is used for receiving poor-quality water and discharging high-quality water, the wetland engineering is generalized in an EFDC model by taking a point source form as boundary input, and is directly discharged according to a certain water quantity and water quality by adopting the point source form in the EFDC model. The method has the main beneficial effects of numerically generalizing the design parameters (such as position, quantity, scale and standard) of the engineering into the EFDC model and providing a key technical support for quantitatively simulating and analyzing the water environment influence implemented by the engineering.

In an optional embodiment, in step S106, according to design parameters of a water replenishing project, the EFDC model is adjusted according to water quality and water amount data of the water replenishing port before and after the project is implemented, so as to obtain a second EFDC model, which includes: the water supplementing project is taken as a node to enter an EFDC model in a generalized mode according to design parameters of the water supplementing project; and setting boundary conditions of the water supplementing project according to the water quality and water quantity data of the water supplementing port before and after the project is implemented to obtain a second EFDC model. Specifically, point sources such as a water replenishing port, a sewage draining port and a sewage treatment plant and an SWMM outlet are input into the EFDC grid together; fig. 3 shows a diagram of an example of the positions of the water supply ports, the sewage drain, the sewage plant, the SWMM outlet, the EFDC outlet and their coordinate inputs in the EFDC grid. Before and after the water replenishing engineering is built, the same as the treatment mode of point sources such as a sewage draining exit, a sewage plant and the like, a water replenishing opening needing to be edited is selected in the model, corresponding water quantity and water quality are input (Q, C), the setting form of Q and C can be a constant value or a dynamic time sequence value, and the water replenishing engineering is set according to the constant value in the embodiment. Taking the water replenishing ports in the grid of fig. 3 as an example, as shown in table 1 above, before the water replenishing works are constructed, the boundary water amount of each water replenishing work is 0, and the water quality refers to the wetland treatment standard. After the water replenishing engineering is built, the water amount and the water quality corresponding to the water replenishing port are respectively input as shown in the above table 2 according to the engineering plan.

In the embodiment of the invention, the generalization of the water replenishing engineering in the EFDC model is to take a point source form as boundary input, and the EFDC model directly adopts the point source form to discharge according to a certain water quantity and water quality. The method has the main beneficial effects that the design parameters (position, quantity, scale, standard and the like) of the project are numerically generalized into the EFDC model, and a key technical support is provided for quantitatively simulating and analyzing the water environment influence implemented by the project.

In an optional embodiment, in step S108, the evaluating the environmental effects of the wetland engineering and the water replenishing engineering according to the first output data, the second output data, the third output data, the wetland engineering investment data and the water replenishing engineering investment data includes: obtaining a first water quality index concentration and a first water quantity of a section to be examined according to the first output data and a preset water quality index, wherein the section to be examined is a downstream outlet section of a river channel in a research area, a key focus section or a water quality assessment section; obtaining a second water quality index concentration, a second water quantity, a first water quality index standard time and a first water quality index simulation total time of the section to be examined according to the second output data and a preset water quality index; obtaining a third water quality index concentration, a third water quantity, a second water quality index standard time and a second water quality index simulation total time of the section to be examined according to the third output data and a preset water quality index; calculating a first water quality concentration change rate, a first load flux change quantity, a first standard-reaching rate and a first cost-efficiency ratio based on water quality according to the first water quality index concentration, the first water quantity, the second water quality index concentration, the second water quantity, the first water quality index standard-reaching days, the first water quality index simulation total days and the water supplementing project investment data; calculating a second water quality concentration change rate, a second load flux change quantity, a second standard-reaching rate and a second cost-efficiency ratio based on the water quality according to the first water quality index concentration, the first water quantity, the third water quality index concentration, the third water quantity, the second water quality index standard-reaching days, the second water quality index simulation total days and the water supplementing project investment data; evaluating the environmental effect of the wetland engineering according to the first water quality concentration change rate, the first load flux change amount, the first standard reaching rate and the first cost-effectiveness ratio based on the water quality; and evaluating the environmental effect of the water supplementing project according to the second water quality concentration change rate, the second load flux change quantity, the second standard reaching rate and the second cost-effectiveness ratio based on the water quality.

Specifically, the evaluation of the environmental effects of the wetland and the water replenishing engineering comprises the following steps: (1) determining the section of the nucleus to be examined and the quality change of water quality; according to the engineering evaluation requirements, a focus-focused section or an assessment section is selected, such as a downstream outlet section of a riverway in a research area, a focus-focused water quality section, various levels of water quality assessment sections and the like, and common indexes representing water quality conditions, such as Chemical Oxygen Demand (COD), ammonia nitrogen (NH4+ -N), Total Phosphorus (TP) and the like, can be selected as water quality indexes. (2) Determining an index of engineering effect evaluation; the indexes of the engineering effect evaluation comprise a water quality concentration change rate, a load flux change amount, a standard reaching rate and a cost-effectiveness ratio based on water quality change. The water quality concentration change rate mainly represents the water quality concentration reduction degree before and after the engineering, the load flux change mainly represents the load change condition under the combined action of water quantity and water quality before and after the engineering, the change is a positive value and represents that the pollution load is increased after the engineering, otherwise, the pollution load is reduced. The standard reaching rate is calculated according to the standard III or IV in the standard GB 3838-2002, the cost-effectiveness ratio based on water quality change is determined according to the water quality change and the corresponding project investment, and the operation effect of the project is evaluated from the economic perspective. (3) Calculating an evaluation index; according to the determined section to be tested and the water quality index, the concentration and water quantity data of the water quality index of the section to be tested before and after the implementation of the wetland engineering, the simulation days after the implementation of the engineering and the days after the concentration of the water quality index reaches the standard can be obtained from the first output data and the second output data, and then according to the investment data of the wetland engineering and a preset calculation formula, the first water quality concentration change rate, the first load flux change amount, the first standard rate and the first cost-efficiency ratio based on the water quality can be calculated, so that the environmental effect of the wetland engineering is evaluated. And the water quality index concentration and water quantity data of the cross section to be checked before and after the implementation of the water supplementing project, the simulation days after the implementation of the project, the days after the water quality index concentration reaches the standard can be obtained from the first output data and the third output data, and then a second water quality concentration change rate, a second load flux change quantity, a second standard rate and a second cost-efficiency ratio based on water quality can be calculated according to the investment data of the water supplementing project and a preset calculation formula, so that the environmental effect of the water supplementing project is evaluated.

The embodiment of the invention establishes an index framework for evaluating the wetland and water replenishing environmental effects, wherein the cost-to-efficiency ratio based on water quality is innovatively provided as an index, and the addition of the index can provide guidance for the investment of engineering. The change of water quality can be simulated under different engineering conditions or at different stages of engineering, and the respective cost-to-efficiency ratio is analyzed in combination with corresponding investment, so that the best effect achieved by the minimum investment can be determined.

In an alternative embodiment, the water quality concentration change rate, the load flux change amount, the standard reaching rate and the water quality-based cost-effectiveness ratio are calculated by the following formulas:

W＝C _t *Q _t -C ₀ *Q ₀ (2)

wherein: k represents the rate of change of water concentration, C ₀ 、C _t Respectively representing the water quality index concentration (mg/l) before and after the engineering; w represents the amount of change in load flux, Q ₀ 、Q _t Respectively represents the water quantity (m) before and after the project ³ S); s represents the achievement rate, D _s 、D _T The number of days for reaching the water quality index standard and the total number of simulated days (day) after the engineering are expressed; r represents the cost-to-efficiency ratio based on water quality, and M represents the engineering investment (ten thousand yuan).

In an alternative embodiment, step S102, constructing a SWMM and EFDC first coupling model according to the first geographic data, the second geographic data, the third geographic data and the fourth geographic data includes:

constructing an SWMM model according to the first geographic data; specifically, after the collected land utilization data, DEM data, rainfall site positions and other basic data are subjected to format processing, sub-catchment areas are divided, and an SWMM model is constructed. The method for processing the formats of the basic data such as pipe network data, land utilization data, DEM data, rainfall site positions and the like comprises the following steps: the ArcGIS is used for generalizing pipe networks and water systems, cutting and distributing land utilization and the like.

Obtaining output data of the runoff water quality and the water quantity of the pipe network of the research area according to the second geographic data and the SWMM model; specifically, the collected rainfall and the corresponding observation time sequence, the evaporation capacity in the research area and the corresponding observation time sequence are processed into a format which can be identified by the SWMM model, and then the SWMM model is input to be used as the drive of the SWMM model, the parameters of the SWMM model are calibrated, and output data of the runoff water quality and the water quantity of the pipe network of the research area are obtained. The calibrated parameters comprise pipeline roughness, the characteristic width of the sub catchment area, a water impermeability runoff coefficient, a water permeability runoff coefficient, a water impermeability depression water storage capacity, a water permeability depression water storage capacity, a sub catchment area Manning coefficient, a pollutant accumulation index coefficient, a pollutant scouring index coefficient and the like.

Constructing an EFDC model according to the third geographic data and the fourth geographic data; specifically, after formatting collected research area water system distribution, relevant data (position, sewage discharge flow and sewage discharge concentration) of a research area sewage treatment plant, relevant data (sewage discharge position, sewage discharge flow and sewage discharge concentration) of a research area sewage discharge outlet, position of a research area hydrological station, position of a water quality monitoring station, river terrain data, river inflow flow sequence data of historical monitoring or field monitoring of a research area river hydrological station and river inflow background concentration sequence data of historical monitoring or field monitoring of a water quality monitoring station, an EFDC model is constructed.

And coupling the SWMM model and the EFDC model according to the output data of the runoff water quality and the water quantity of the pipe network of the research area to generate a first coupling model of SWMM and EFDC. Specifically, water quality and water quantity data output by the SWMM model are used as boundaries of land runoff and surface sources of the EFDC model, input into the EFDC model, used as driving of the EFDC model, and used for calibrating parameters of the EFDC model, completing coupling of the SWMM model and the EFDC model, and generating a first coupling model of SWMM and EFDC. The parameters to be calibrated include the roughness of the river channel, the degradation coefficient of pollutants and the like.

The SWMM model and the EFDC model are respectively constructed, the output data of the SWMM model is used as the input data of the EFDC model, the SWMM model and the EFDC model are coupled and used for simulating the water environment in the river channel, because the SWMM model can obtain the output data of the water quality and the water quantity of the pipe network runoff of the research area through the first geographic data representing the pipe network runoff of the research area and the second geographic data representing the pipe network parameter of the research area, therefore, the urban non-point source process can be simulated, the output data of the SWMM model is used as the input data of the EFDC model and is used as the non-point source boundary of the EFDC model, the defect that the urban non-point source is not considered thoroughly in the hydrodynamic water quality model can be overcome, therefore, the water yield-hydrodynamic force-water quality simulation of point-surface source 'water-land integration' in plain urban areas can be effectively supported, and the simulation analysis of the water environment effect under the dual influences of natural conditions and human activities is realized. In the embodiment of the invention, the SWMM model divides the drainage basin into a plurality of control units (sub-catchment areas), each control unit can generate non-point source pollution by rainfall runoff scouring, and from the pollution treatment perspective, reference can be provided for implementing refined space management and control based on refined control units, so that the accuracy of the SWMM traditional model is further improved.

The method for evaluating the environmental effects of the wetland and water replenishing engineering based on the SWMM and the EFDC according to the embodiment of the invention is described in an embodiment.

(I) basic data collection processing

The collected case zone basic data includes four types of spatial data, pollution data, hydrological data and meteorological data, and the collection results are shown in table 3.

TABLE 3

TABLE 4

TABLE 5

Serial number of sewage draining outlet	COD(mg/L)	Amount of water (m) ³ /d)
			P1	79.76	900
P2	126.4	500
			P3	316	100
P4	39.13	100
			P5	143	1000
P6	191.1	2500
			P7	210.7	1000

TABLE 6

From the case area water system distribution and the land use data, a case area water system and land use distribution map can be formed, as shown in fig. 4. And forming a point bitmap of each element of the case area according to the water system distribution, the drain outlet position, the assessment section position, the sewage treatment plant position, the rainfall station position, the flow monitoring station position, the storage tank position and the soil type data of the case area, as shown in fig. 5. And forming case area wetland engineering and water supplementing engineering point bitmaps according to the number and the positions of the wetlands and the number and the positions of the water supplementing holes, as shown in fig. 6. From the digital elevation DEM data, a case zone DEM digital elevation map can be formed, as shown in fig. 7. A schematic diagram of a large cross section of the river terrain in the case zone can be formed according to the river terrain data, as shown in fig. 8. From the rainfall data, a histogram of the rainfall daily scale of the rainfall station in the case zone can be formed, as shown in fig. 9.

(II) construction of water environment model

(1) SWMM model construction

The boundary of the research area range, Digital Elevation Model (DEM) data, rainfall station coordinate position, evaporation station coordinate position, land utilization data, soil type data, river channel assessment section position and the like are generalized to form a pipe network, a sub-catchment area and a water outlet by utilizing ArcGIS, and SWMM software is introduced to form a model framework, as shown in FIG. 10. Setting the length, the pipe diameter and the roughness of a pipeline, defining the area, the gradient, the water collection node and the characteristic width of a sub-water collection area, the water impermeability runoff coefficient, the water permeability runoff coefficient, the water impermeability depression water storage capacity, the water permeability depression water storage capacity, the Manning coefficient of the sub-water collection area and the like, finishing parameter calibration and model verification of an SWMM model by using rainfall data of a rainfall station as driving conditions, and providing runoff and surface source boundaries for the EFDC river hydrodynamic water quality model by the water quality output from the outlet of the model.

(2) EFDC model building

The method comprises the steps of carrying out grid division on a watershed water system, comprehensively considering solving efficiency of a model, irregularity of a calculation area, an actually measured terrain data range and grid required precision requirements in a grid arrangement process, and adopting a high-resolution Cartesian grid.

(3) SWMM and EFDC model coupling and calibration verification

The method comprises the steps of generating a river channel digital model based on a river channel section extracted from a terrain, generalizing river channels and input and output boundaries, inputting flow water quality boundaries (time series or annual average constant) of all water systems in a case area and runoff and surface source boundary achievements output by an SWMM (single-wall switch memory) as driving conditions of a river channel hydrodynamic water quality model, and completing coupling of the SWMM pipe network runoff model and the EFDC river channel hydrodynamic water quality model to generate a first coupling model of the SWMM and the EFDC. Fig. 11-12 show the simulation calibration results of the first coupling model. The embodiment of the invention takes the Chemical Oxygen Demand (COD) of a typical pollutant as a water quality index to evaluate the effects of wetland and water replenishing engineering.

Wetland and water replenishing engineering generalization

2 wetland blocks are built in the case area together, and the total water treatment amount is 4.63 ten thousand meters ³ D, designing a water replenishing port 6, wherein the total water replenishing amount is 12.7 ten thousand meters ³ /d。

The engineering generalization concrete operation is as follows:

(1) case zone wetland and moisturizing project location (x, y)

According to the data collection situation, the wetland water-reducing and water-replenishing positions of the case area are shown in fig. 13, wherein W1 and W2 are wetland water-reducing and D1 to D6 are water-replenishing, and are input into the EFDC grid by actual geographic coordinates.

2) Setting of boundary conditions before engineering

Before and after the construction of the wetland and the water replenishing engineering, the method is the same as the treatment mode of point sources such as a sewage discharge outlet, a sewage plant and the like, a wetland water outlet and a wetland water replenishing outlet which need to be edited are selected from a model, corresponding water quantity and quality (Q, C) are input, the setting form of Q and C can be a constant value or a dynamic time sequence value, and the case area wetland and the water replenishing engineering are set according to the constant value. Before the wetland and water replenishing projects are constructed, as shown in table 7, the boundary water amount of each wetland and water replenishing point project is 0, and the water quality refers to the wetland treatment standard and the tail water discharge standard of a sewage plant respectively.

TABLE 7

Categories	Form(s) of	Time	Amount of water (m) ³ /d)	Water quality COD (mg/l)
					Wetland W1	Constant value	All year round	0	Processing criteria
Wetland W2	Constant value	All year round	0	Processing criteria
					Water supplement D1	Constant value	All year round	0	Discharge standard of sewage plant
Water supplement D2	Constant value	All year round	0	Discharge standard of sewage plant
					Water supplement D3	Constant value	All year round	0	Discharge standard of sewage plant
Water supplement D4	Constant value	All year round	0	Discharge standard of sewage plant
					Water supplement D5	Constant value	All year round	0	Discharge standard of sewage plant
Water supplement D6	Constant value	All year round	0	Discharge standard of sewage plant

(3) Setting of post-engineering boundary conditions

After the wetland construction and the water supplement are completed, the water quantity and the water quality corresponding to the wetland water outlet and the water supplement outlet are respectively input according to the engineering plan as shown in the table 8:

TABLE 8

Categories	Form(s) of	Time	Amount of water (m) ³ /d)	Water quality COD (mg/l)
					Wetland W1	Constant value	All year round	24000	25
Wetland W2	Constant value	All year round	22300	25
					Water supplement D1	Constant value	All year round	15000	30
Water supplement D2	Constant value	All year round	25000	30
					Water supplement D3	Constant value	All year round	27000	30
Water supplement D4	Constant value	All year round	42700	30
					Water supplement D5	Constant value	All year round	9600	30
Water supplement D6	Constant value	All year round	7700	30

(IV) evaluation of wetland and water replenishing engineering effects

(1) Determining an assessment section: as shown in fig. 5;

(2) determining a water quality index: taking the Chemical Oxygen Demand (COD) of typical pollutants as a water quality index;

(3) evaluation index results: based on the constructed first coupling model of the SWMM pipe network hydrological runoff and the EFDC one-dimensional riverway hydrodynamic water quality, the generalized wetland and the water supplementing engineering are respectively substituted into the model for calculation, the water quality change rate, the pollution load flux variation, the standard reaching rate and the cost efficiency ratio obtained by calculation according to the formulas (1) to (4) are shown in a table 9, and the water quality change before and after the engineering is shown in a graph 14 and a graph 15.

TABLE 9

From fig. 14 and fig. 15, it can be seen that the COD background concentration under the non-engineering condition is 59.28mg/L, the COD average concentration under the wetland treatment condition is 34.58mg/L, the concentration change rate is 41.7%, the pollution load flux change amount is-817.2 t, the standard reaching rate according to the IV water standard is 1.9%, and the cost-benefit ratio based on the water quality change is 0.082mg/(L ten thousand yuan); under the water replenishing condition, the average COD concentration is 39.94mg/L, the concentration change rate is 32.6 percent, the pollution load reduction amount is 56.8t, the water replenishing water amount is large, the pollution load of the water body is increased to a certain extent, the standard reaching rate is 1.6 percent according to the IV-class water standard, and the cost-efficiency ratio based on the water quality change is 0.077 mg/(L.ten thousand yuan). Considering according to the standard reaching rate and pollution load reduction, the wetland engineering effect is superior to the water replenishing engineering, but the water replenishing engineering effect is superior to the wetland engineering according to the principle that the smaller the cost-to-efficiency ratio is, the better the engineering benefit is. The greater the cost-effectiveness ratio, the higher the environmental improvement benefit of project investment, the better the wetland engineering effect than the water replenishing project, but according to the pollution load flux variation, the wetland engineering reduces the pollution load, but the water replenishing project increases the pollution load, so the engineering scheme can not be determined by only considering the cost-effectiveness ratio, but also by taking the rigid standard-reaching rate and the project implementation water quality concentration requirement as precondition, and combining the load flux variation, the concentration variation rate and other comprehensive judgment and determination.

By combining the analysis, the wetland engineering has better water quality improvement effect than the water replenishing engineering, and in the actual engineering construction process, the water replenishing engineering and the wetland engineering can be simultaneously implemented to properly optimize the engineering scheme on the premise of realizing the water quality reaching the standard, so that the optimal engineering benefit is achieved with the minimum investment.

The embodiment of the invention also provides a wetland and water replenishing engineering environmental effect evaluation device based on SWMM and EFDC, as shown in FIG. 16, comprising: the first acquiring unit 161 is configured to acquire first geographic data representing runoff of a pipe network of a research area, second geographic data representing pipe network parameters of the research area, third geographic data representing distribution of a river channel of the research area, and fourth geographic data representing hydrodynamic water quality of the river channel of the research area; the detailed description of the specific implementation manner is given in step S101 in the above method embodiment, and is not repeated herein. The first construction unit 162 is configured to construct an SWMM and EFDC first coupling model according to the first geographic data, the second geographic data, the third geographic data and the fourth geographic data, so as to obtain first output data of water quality and water amount before implementation of the wetland and water replenishing project; the detailed description of the specific implementation manner is given in step S102 in the above method embodiments, and is not repeated herein. The second obtaining unit 163 is used for obtaining design parameters of the wetland and the water replenishing engineering, water quality and water quantity data of the wetland water outlet and the water replenishing outlet before and after the engineering is implemented, and wetland engineering investment data and water replenishing engineering investment data; the detailed description of the specific implementation manner is given in step S103 in the above method embodiments, and is not repeated herein. The first adjusting unit 164 is configured to adjust the EFDC model according to the design parameters of the wetland engineering and the data of the water quality and the water amount of the wetland water-removing opening before and after the engineering is implemented, so as to obtain a first EFDC model; the detailed description of the specific implementation manner is given in step S104 in the above method embodiment, and is not repeated here. A second construction unit 165, configured to construct an SWMM and EFDC second coupling model according to the first EFDC model, so as to obtain second output data of water quality and water amount after the wetland engineering is implemented; the detailed description of the specific implementation manner is given in step S105 in the above method embodiments, and is not repeated herein. A second adjusting unit 166, configured to modify the EFDC model according to the design parameters of the water replenishing project and the water quality and water amount data of the water replenishing port before and after the project is implemented, so as to obtain a second EFDC model; the detailed description of the specific implementation manner is given in step S106 in the above method embodiment, and is not repeated herein. A third constructing unit 167, configured to construct an SWMM and EFDC third coupling model according to the second EFDC model, to obtain third output data of water quality and water amount after the water replenishing project is implemented; the detailed description of the specific implementation manner is given in step S107 in the above method embodiment, and is not repeated herein. And the evaluation unit 168 is configured to evaluate the environmental effects of the wetland engineering and the water replenishing engineering according to the first output data, the second output data, the third output data, the wetland engineering investment data and the water replenishing engineering investment data. The detailed description of the specific implementation manner is given in step S108 in the above method embodiment, and is not repeated herein.

The wetland and water-supplementing engineering environmental effect evaluation device based on SWMM and EFDC provided by the embodiment of the invention is characterized in that a network management hydrological model (SWMM) is embedded in a traditional riverway hydrodynamic water quality model (EFDC) to form an SWMM and EFDC coupling model, and the wetland and water-supplementing engineering environmental effect is evaluated, because the SWMM model takes urban rainfall runoff (urban area source pollution) into consideration, the SWMM and EFDC coupling model comprehensively takes the integrity and systematicness of a watershed into consideration, and takes the conditions of terrain, pipe network, hydrology, meteorology, water quality and the like into consideration, when the wetland and water-supplementing engineering environmental effect is evaluated through the SWMM and EFDC coupling model, the influence of area source pollution generated by rainfall runoff on the water quality section reaching the standard can be comprehensively simulated and analyzed, and when the wetland and water-supplementing engineering are generalized to enter the EFDC model, the engineering design parameters (position, quantity, scale, standard and the like) are numerically generalized and generalized to be generalized to the EFDC model, therefore, the influence of the engineering design parameters on the wetland and water replenishing engineering environmental effects is considered, the evaluation on the wetland and water replenishing engineering environmental effects is more accurate, and a key technical support is provided for quantitatively simulating and analyzing the water environment influence implemented by engineering.

An embodiment of the present invention further provides a computer device, including: at least one processor 171; and a memory 172 communicatively coupled to the at least one processor; fig. 17 illustrates an example of one processor 171.

The processor 171 and the memory 172 may be connected by a bus or by other means, and fig. 171 illustrates an example of a connection by a bus.

The processor 171 may be a Central Processing Unit (CPU). The Processor 171 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.

The memory 172, which is a non-transitory computer-readable storage medium, may be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as program instructions/modules corresponding to the SWMM and EFDC-based environmental effect assessment method for wetland and water replenishment engineering in the embodiment of the present invention. The processor 171 executes various functional applications and data processing of the processor by running the non-transitory software programs, instructions and modules stored in the memory 172, that is, implements the SWMM and EFDC-based wetland and moisturizing engineering environmental effect evaluation method in the above method embodiment.

The memory 172 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 171, and the like. Further, the memory 172 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 172 may optionally include memory located remotely from the processor 171, which may be connected to the processor 171 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

One or more modules are stored in the memory 172, and when executed by the processor 171, the method for evaluating the environmental effect of the wetland and water replenishment engineering based on SWMM and EFDC in the embodiment shown in fig. 1 is performed.

The details of the computer device can be understood with reference to the corresponding related descriptions and effects in the embodiment shown in fig. 1, and are not described herein again.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a flash Memory (FlashMemory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid-State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A wetland and water replenishing engineering environmental effect evaluation method based on SWMM and EFDC is characterized by comprising the following steps:

acquiring first geographic data used for representing pipe network runoff of a research area, second geographic data used for representing pipe network parameters of the research area, third geographic data used for representing river channel distribution of the research area and fourth geographic data used for representing hydrodynamic water quality of river channels of the research area;

constructing a SWMM and EFDC first coupling model according to the first geographic data, the second geographic data, the third geographic data and the fourth geographic data to obtain first output data of water quality and water quantity before implementation of wetland and water replenishing projects;

acquiring design parameters of wetland and water replenishing engineering, water quality and water quantity data of a wetland water outlet and a water replenishing port before and after engineering implementation, wetland engineering investment data and water replenishing engineering investment data;

adjusting an EFDC model according to the water quality and water quantity data of the wetland water outlet before and after the engineering is implemented according to the design parameters of the wetland engineering to obtain a first EFDC model;

constructing a SWMM and EFDC second coupling model according to the first EFDC model to obtain second output data of water quality and water quantity after the wetland engineering is implemented;

according to the design parameters of the water supplementing project, the EFDC model is adjusted according to the water quality and water quantity data of the water supplementing port before and after the project is implemented, and a second EFDC model is obtained;

constructing a SWMM and EFDC third coupling model according to the second EFDC model to obtain third output data of water quality and water quantity after the water replenishing engineering is implemented;

evaluating the environmental effects of the wetland engineering and the water replenishing engineering according to the first output data, the second output data, the third output data, the wetland engineering investment data and the water replenishing engineering investment data;

the evaluation of the environmental effects of the wetland engineering and the water replenishing engineering according to the first output data, the second output data, the third output data, the wetland engineering investment data and the water replenishing engineering investment data comprises the following steps:

obtaining a first water quality index concentration and a first water quantity of a section to be examined according to the first output data and a preset water quality index, wherein the section to be examined is a downstream outlet section of a river channel in a research area, a focus attention section or a water quality examination section;

obtaining a second water quality index concentration, a second water quantity, a first water quality index standard time and a first water quality index simulation total time of the section to be examined according to the second output data and a preset water quality index;

obtaining a third water quality index concentration, a third water quantity, a second water quality index standard time of day and a second water quality index simulation total time of day of the cross section to be tested according to the third output data and a preset water quality index;

calculating a first water quality concentration change rate, a first load flux change quantity, a first standard-reaching rate and a first cost-efficiency ratio based on water quality according to the first water quality index concentration, the first water quantity, the second water quality index concentration, the second water quantity, the first water quality index standard-reaching days, the first water quality index simulation total days and water supplementing engineering investment data;

calculating a second water quality concentration change rate, a second load flux change amount, a second standard-reaching rate and a second cost-efficiency ratio based on the water quality according to the first water quality index concentration, the first water quantity, the third water quality index concentration, the third water quantity, the second water quality index standard-reaching days, the second water quality index simulation total days and the water supplementing engineering investment data;

evaluating the environmental effect of the wetland engineering according to the first water quality concentration change rate, the first load flux change amount, the first standard reaching rate and the first cost-effectiveness ratio based on the water quality;

and evaluating the environmental effect of the water supplementing project according to the second water quality concentration change rate, the second load flux change quantity, the second standard reaching rate and the second cost-effectiveness ratio based on the water quality.

2. The wet land and water replenishing engineering environmental effect evaluation method based on SWMM and EFDC as claimed in claim 1, wherein the step of adjusting an EFDC model according to the design parameters of the wet land engineering and the water quality and quantity data of the wet land recession before and after the engineering implementation to obtain a first EFDC model comprises the following steps:

the wetland engineering is input into the EFDC model as nodes in a generalized mode according to the design parameters of the wetland engineering;

and setting boundary conditions of the wetland project according to the water quality and water quantity data of the wetland water outlet before and after the project is implemented to obtain a first EFDC model.

3. The wet land and water supplement engineering environmental effect evaluation method based on SWMM and EFDC as claimed in claim 1, wherein according to the design parameters of the water supplement engineering, the water quality and water quantity data of the water supplement port before and after the engineering implementation are used for adjusting the EFDC model to obtain a second EFDC model, comprising:

generalizing the water supplementing project into the EFDC model as nodes according to design parameters of the water supplementing project;

and setting boundary conditions of the water supplementing project according to the water quality and water quantity data of the water supplementing port before and after the project is implemented to obtain a second EFDC model.

4. The wet land and water replenishing engineering environmental effect evaluation method based on SWMM and EFDC as claimed in claim 1, wherein the water quality concentration change rate, the load flux change amount, the standard reaching rate and the water quality-based cost-effectiveness ratio are calculated by the following formulas:

water concentration change rate k:

load flux variation W: w ═ C _t *Q _t -C ₀ *Q ₀

Standard reaching rate S:

cost-to-benefit ratio based on water quality R:

wherein: k represents the rate of change of water concentration, C ₀ 、C _t Respectively representing the water quality index concentration before and after the engineering, mg/l; w represents the amount of change in load flux, Q ₀ 、Q _t Respectively representing the water quantities before and after the project, m ³ S; s represents the achievement rate, D _s 、D _T Expressing the days of reaching the water quality index standard after engineering, the total number of simulated days and day; r represents the cost-to-efficiency ratio based on water quality, and M represents engineering investment, ten thousand yuan.

5. The method for evaluating the environmental effect of swam and EFDC-based wetland and water replenishment engineering according to claim 1, wherein the constructing of the first SWMM and EFDC coupling model according to the first geographic data, the second geographic data, the third geographic data and the fourth geographic data comprises:

constructing an SWMM model according to the first geographic data;

obtaining output data of the runoff water quality and the water quantity of the pipe network of the research area according to the second geographic data and the SWMM model;

constructing an EFDC model according to the third geographic data and the fourth geographic data;

and coupling the SWMM model and the EFDC model according to the output data of the runoff water quality and the water quantity of the pipe network of the research area to generate a first coupling model of SWMM and EFDC.

6. The utility model provides a wetland, moisturizing engineering environmental effect evaluation device based on SWMM and EFDC which characterized in that includes:

the system comprises a first acquisition unit, a second acquisition unit and a third acquisition unit, wherein the first acquisition unit is used for acquiring first geographic data for representing the runoff of a pipe network of a research area, second geographic data for representing pipe network parameters of the research area, third geographic data for representing the distribution of a river channel of the research area and fourth geographic data for representing the hydrodynamic water quality of the river channel of the research area;

the first construction unit is used for constructing a SWMM and EFDC first coupling model according to the first geographic data, the second geographic data, the third geographic data and the fourth geographic data to obtain first output data of water quality and water quantity before the implementation of wetland and water replenishing projects;

the second acquisition unit is used for acquiring design parameters of the wetland and the water replenishing engineering, water quality and water quantity data of a wetland water outlet and a water replenishing outlet before and after the engineering is implemented, and wetland engineering investment data and water replenishing engineering investment data;

the first adjusting unit is used for adjusting the EFDC model according to the design parameters of the wetland engineering and the water quality and water quantity data of the wetland water outlet before and after the engineering is implemented to obtain a first EFDC model;

the second construction unit is used for constructing a SWMM and EFDC second coupling model according to the first EFDC model to obtain second output data of water quality and water quantity after the wetland engineering is implemented;

the second adjusting unit is used for modifying the EFDC model according to the design parameters of the water supplementing project and the water quality and water quantity data of the water supplementing port before and after the project is implemented to obtain a second EFDC model;

the third construction unit is used for constructing a SWMM and EFDC third coupling model according to the second EFDC model to obtain third output data of water quality and water quantity after the water replenishing engineering is implemented;

the evaluation unit is used for evaluating the environmental effects of the wetland engineering and the water replenishing engineering according to the first output data, the second output data, the third output data, the wetland engineering investment data and the water replenishing engineering investment data; the evaluation of the environmental effects of the wetland engineering and the water replenishing engineering according to the first output data, the second output data, the third output data, the wetland engineering investment data and the water replenishing engineering investment data comprises the following steps:

obtaining a second water quality index concentration, a second water quantity, a first water quality index standard time of day and a first water quality index simulation total time of day of the cross section to be tested according to the second output data and a preset water quality index;

obtaining a third water quality index concentration, a third water quantity, a second water quality index standard-reaching day number and a second water quality index simulation total day number of the section to be examined according to the third output data and a preset water quality index;

7. A computer device, comprising:

at least one processor; and a memory communicatively coupled to the at least one processor; the storage stores instructions executable by the processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the wet land and water replenishing engineering environmental effect evaluation method based on SWMM and EFDC according to any one of claims 1 to 5.

8. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions for causing the computer to execute the SWMM and EFDC-based wetland and moisturizing engineering environmental effect evaluation method according to any one of claims 1 to 5.