CN102930157A - Water body hydrodynamic characteristic partitioning method for channel type reservoir tributary backwater region - Google Patents
Water body hydrodynamic characteristic partitioning method for channel type reservoir tributary backwater region Download PDFInfo
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Abstract
The invention relates to a water body hydrodynamic characteristic partitioning method for a channel type reservoir tributary backwater region, particularly relates to a method for reasonably dividing a hydrodynamic characteristic partition of the channel type reservoir tributary backwater region under the combined action of multiple factors according to a numerical calculation result. After a hydrodynamic field is obtained by using a numerical method, firstly given conservative material inputs are respectively taken as tracer agents under the incoming boundary condition of mainstream and tributaries, the reasonable range of a mainstream influence region can be determined by analyzing and researching the concentrations of the tracer agents in the region, and a channel region, a transition region and a lake region can be respectively divided according to flow rate from upstream to downstream outside the mainstream influence region. According to the method, a reliable result can be obtained without depending on field monitoring, the hydrodynamic characteristic of the region is partitioned in the early regional planning of the channel type reservoir tributary backwater region, the region is reasonably planned by combining the characteristic of each partition, each natural characteristic in the region is completely utilized, and the feasibility of the planning is efficiently improved.
Description
Technical field
The invention belongs to the technical field of environmental protection and comprehensive utilization of resources, particularly relate to the method for gulf, storehouse, a kind of river-like reservoir tributary hydrodynamic property subregion.
Background technology
Transformation along with China's hydroelectric development target; in recent years; national correlation department has proposed to greatly develop water power under the prerequisite of protection of the environment; hydroelectric development is progressively restricted the environmental constraints stage of transition stage by economic technology; therefore in hydroelectric development in earlier stage; need to be investigated for the water power reservoir area of intending exploitation, estimate the rationality of hydroelectric development, and formulate rational Its Regional Development Policy according to the conditions for economic development of reservoir area.After Reservoir, because the defeated ability of moving of water body weakens, some tributary Ku Wan in reservoir area, if the nutrient source such as nitrogen, phosphorus abundance, in the more sufficient situation of light application ratio, can produce " wawter bloom " phenomenon in subregion, affect the reservoir area people's productive life, therefore gulf, storehouse, reservoir tributary bank is reasonably planned, avoid " wawter bloom " phenomenon to produce and seem particularly important in impact the people.
Existing research shows, the distribution of Hydrodynamic field disappears larger impact is arranged the life of " wawter bloom " in the storehouse, lake, in the essentially identical situation of other condition, difference due to hydrodynamic property, can produce comparatively significantly ecological zoning in the storehouse, lake, particularly, for gulf, storehouse, river-like reservoir tributary, show more outstanding.As (lake science such as Cai Qinghua, 2012) analyzed that Water Environment of Three Gorges dynamic temporal-spatial heterogeneity, reservoir vertical partition and group form, the origin cause of formation of vertical distribution and algal bloom and dynamically after point out, the difference of Yu Xiangxi He Ku gulf, Three Gorges Reservoir master stream hydraulics characteristic is to drive the dynamic key factor of its water environment, and its Heavenly Stems and Earthly Branches flowing water power condition is research emphasis.Therefore for gulf, storehouse, river-like reservoir tributary, its hydrodynamic property being carried out to classifying rationally, is the Main Basis that Regional Water Environment is administered and planned.
Just existing document, pertinent literature is only that the more general river-like reservoir tributary Ku Wan that points out should be divided into the zone of influence, master stream, lake country, zone of transition and natural river course at present, but there is no pertinent literature, gulf, storehouse hydrodynamic property subregion is proposed to clear and definite division methods.Existing document and patent are carried out ecological zoning according to monitoring result to the nutrients of Hu Ku, technical method as publication number a kind of lake nutrient partition control technique patent of invention that is CN102496067A and publication number a kind of Lakes in Nutrition thing ecological zoning Boundary Recognition that is CN102495877A, provided the correlation technique of Lakes in Nutrition thing and ecological zoning, reasonable reference can be provided.But should point out, this method need rely on the Monitoring Data of a large amount of long-time sequences in scene, for intending the reservoir of building, can't grasp according to these methods the ecological zoning in gulf, storehouse, tributary, reservoir area, therefore need to provide a kind of rational Forecasting Methodology, for the planning and development in the tributary area of gulf, storehouse provides reference.
The information that is disclosed in this background of invention technology part only is intended to deepen the understanding to general background technology of the present invention, and should not be regarded as admitting or imply that in any form this information structure has been prior art known in those skilled in the art.
Summary of the invention
Technical matters to be solved by this invention is, overcomes the shortcoming of prior art, and gulf, storehouse, river-like reservoir tributary water body hydrodynamic property partition method is provided.
In order to achieve the above object, the invention provides gulf, storehouse, a kind of river-like reservoir tributary water body hydrodynamic property partition method, it comprises the following steps:
(i) adopt numerical method to obtain the Hydrodynamic field in survey region, and the result of calculation of storage of water aerodynamic field;
(ii) respectively on Heavenly Stems and Earthly Branches stream upstream becomes a mandarin border the conservation material of setting unit density be tracer agent, utilize the Hydrodynamic field result of calculation of storage to analyze the spatial and temporal distributions of tracer agent in the gulf, storehouse, if in research period zoning the ratio of each point Heavenly Stems and Earthly Branches stream tracer concentration and initial value and be not more than 0.9, need the initial period of calculating is passed forward, when the ratio of each point Heavenly Stems and Earthly Branches stream tracer concentration in research period zone and initial value and while being greater than 0.9, storage tracer agent spatial and temporal distributions result, carry out next step analysis;
(iii) read the tracer agent spatial and temporal distributions result of storage, the CONCENTRATION DISTRIBUTION of each point master stream tracer agent in set period in the statistical computation zone, if the ratio of certain any master stream tracer concentration and master stream tracer concentration initial value in survey region, all be greater than 60% within the time of set period 80%, this point within the research period, in the zone of influence, master stream, otherwise studying in the period not in the zone of influence, master stream by this point;
If (iv) this point, not in the zone of influence, master stream, reads the result of calculation of Hydrodynamic field, the time of adding up this mean flow rate distributes, if all be less than 0.01m/s within the time of set period 80%, this point is being studied in the period in lake country; If this mean flow rate all is greater than 0.01m/s and is not more than 0.05m/s within the time of set period 80%, studying in the period in zone of transition; If this mean flow rate all is greater than 0.05m/s within the time of set period 80%, this point is being studied in the period in the natural river course district;
(v) according to the analysis result of each point, the each point hydraulic performance is sorted out, if in the section of 1km, point more than 60% is arranged all in a hydraulic performance district, can think that this section is all in this hydraulic performance district, statistics can obtain the hydraulic performance subregion result of survey region within the research period piecemeal.
In above-mentioned gulf, storehouse, river-like reservoir tributary water body hydrodynamic property partition method, zoning should comprise river-like reservoir master stream and tributary Ku Wan; The computer capacity of reservoir can respectively selected one section with tributary Ku Wan intersection upstream and downstream, and length should be greater than 50 times of depth of waters, thereby improves counting yield.
In above-mentioned gulf, storehouse, river-like reservoir tributary water body hydrodynamic property partition method, the master stream conservation material used from the tracer agent in tributary should be different.
The invention has the beneficial effects as follows: the accurate subregion of realizing gulf, storehouse, a kind of river-like reservoir tributary water body hydrodynamic property, the foundation that provides subregion to treat for monitoring, forecast, analysis and the improvement of gulf, storehouse, tributary water environmental problems, effectively improve the feasibility of planning, for the mankind more rational utilization of water resources method is provided.
The accompanying drawing explanation
The process flow diagram that Fig. 1 is method provided by the present invention.
Fig. 2 is the zoning schematic diagram.
Fig. 3 is hydrodynamic property subregion and wawter bloom spatial and temporal distributions corresponding diagram.
Embodiment
Fig. 1 is the process flow diagram according to gulf, storehouse, river-like reservoir of the present invention tributary water body hydrodynamic property partition method.
According to gulf, storehouse, river-like reservoir of the present invention tributary water body hydrodynamic property partition method, can first determine survey region and the scope of research period, then select to carry out the zone of numerical evaluation according to the size of survey region, the zone of numerical evaluation should be greater than survey region, and the period of numerical simulation also should comprise the research period.For considering the impact in Dui Kuwan tributary, river-like reservoir master stream when the numerical simulation, the zone of numerical simulation should comprise part reservoir master stream district, and the scope in master stream district should be able to comprise Heavenly Stems and Earthly Branches stream intersection, the border, upstream and downstream should surpass 50 times of depth of waters apart from the distance of Heavenly Stems and Earthly Branches stream intersection simultaneously, if do not consider counting yield, the simulated domain range of choice is the bigger the better.After simulated domain is selected, the grid division is carried out in zone, the grid of division need meet the orthogonality requirement.When numerical simulation, after the selected simulation period, need given boundary condition and starting condition, boundary condition comprises upstream boundary condition, downstream boundary condition, wall boundary condition three major types, wherein the upstream boundary condition comprises flow border, Ji Kuwan tributary, flow border, master stream, the common given water level boundary condition of downstream boundary condition; Upstream flowrate border and level of tail water border can, according to the difference of analyzing operating mode, be determined by historical analysis of hydrological data.The wall border is given as without the slippage border; The boundary condition that starting condition should be selected with when simulation adapts, to guarantee the stability of numerical simulation.After having simulated, the analog result of Hydrodynamic field is stored.
In addition, adopting numerical method to obtain Hydrodynamic field is to well known to a person skilled in the art technology, therefore no longer too much repeats.
After obtaining the analog result of Hydrodynamic field, boundary condition and upstream, the Ku Wan tributary boundary condition that becomes a mandarin that becomes a mandarin in the upstream, master stream respectively adds respectively conservation substance A and conservation substance B as tracer agent, utilize the Hydrodynamic field result of calculation of storage to analyze the spatial and temporal distributions of tracer agent in the gulf, storehouse, if in research period zoning the ratio of each point Heavenly Stems and Earthly Branches stream tracer concentration and initial value and be less than 0.9, it is too short with research period zero-time interval that explanation selects to calculate the initial period, need pass forward calculating the initial period, when the ratio of each point Heavenly Stems and Earthly Branches stream tracer concentration in research period zone and initial value and while being greater than 0.9, storage tracer agent spatial and temporal distributions result, carry out next step analysis,
After obtaining the spatial and temporal distributions of tracer agent, selected analysis (the period that need to pay close attention to period, as early summer wawter bloom high-incidence season not in spring), the spatial and temporal distributions of tracer concentration on the fluid stream channel center line is propped up in research along the gulf, storehouse, if in survey region, on center line, certain puts along vertical master stream tracer agent mean concentration the ratio with master stream tracer concentration initial value, all be greater than 60% within the time of selected analysis period 80%, think that this point analyzing in the period in the zone of influence, master stream; If adjacent 2 points are just arranged, point downstream all is not less than 60% within the time of selected analysis period 80%, upstream point all is less than 60% within the time of selected analysis period 80%, the point downstream present position in 2 can be considered the coboundary of the zone of influence, master stream, in this downstream, border to the zone of influence, ，Wei master stream, river mouth, tributary;
The result of calculation that Hydrodynamic field on the fluid stream channel center line is propped up in statistics gulf, storehouse, outer, the zone of influence, master stream, the time of adding up certain some mean flow rate distributes, if this all is less than 0.01m/s within the time of analyzing the period 80%, this point is being studied in the period in lake country; If in the scope of 1km, have point more than 60% in ，Ze Gai section, lake country in lake country; If there is a section to exist, in this downstream, section, point more than 60% is arranged in lake country, and in this upstream, section, do not meet the condition of point in lake country more than 60%, to can be used as downstream, ，Zai Gai border, upstream edge boundary line to the coboundary, the zone of influence, master stream of lake country be lake country to this section mid point;
Equally, the result of calculation that Hydrodynamic field on the fluid stream channel center line is propped up in the statistics zone of influence, master stream and gulf, storehouse, outer, lake country, the time of adding up certain some mean flow rate distributes, if this all is greater than 0.05m/s within the time of analyzing the period 80%, this point is being studied in the period in the natural river course district; If in the scope of 1km, have point more than 60% within the research period in ，Ze Gai section, natural river course district in the natural river course district; If there is a section to exist, in this upstream, section, there is the point more than 60% studying in the period in the natural river course district, and in this downstream, section, do not meet the some condition in the natural river course district within the research period had more than 60%, to can be used as section on the ，Zai Gai border, downstream side boundary line of natural river course be the natural river course district to this section mid point;
The zone of Ku Wan tributary between the upstream edge boundary line of the downstream side boundary line of natural river course and lake country is zone of transition.
Below, provide a more specifically embodiment according to method of the present invention.
Applying method of the present invention chooses Three Gorges retaining spring at initial stage to Xiang Xi He Ku gulf, tributary, reservoir area of Three Gorges and is differentiated for the hydrodynamic property subregion of research period.At first by the described step of invention, zoning is selected: Er Yan， tributary, gulf, storehouse, tributary computer capacity is chosen as to the Gaoyang town to river mouth, in river mouth and the Changjiang river section of crossing, the Changjiang river depth of water is about 120m, 50 times of depth of waters are 6km, should be greater than 6km according to described method main stream of the Yangtze in the computer capacity of intersection's Upstream section, actual selection is 9km, the computer capacity of intersection's tract should be greater than 6km, and actual selection is 9km, and computer capacity is chosen as shown in Figure 2, with a certain year measured discharge data at the given boundary condition that becomes a mandarin of Xiang Xi river upstream boundary, the given boundary condition that becomes a mandarin on the Upper Yangtze River border, the given water level boundary condition on the THE LOWER YANGTZE VALLEY border, starting condition stable Hydrodynamic field acquisition when calculating the common definite steady flow of corresponding Xiang Xi river upstream flowrate, Upper Yangtze River flow and the THE LOWER YANGTZE VALLEY water level institute of initial time, after starting condition and boundary condition are determined, adopt Hydrodynamic field the storage of numerical calculations survey region within the research period, then on the basis of the hydrodynamic force aerodynamic field obtained, in the conservation substance A of the given unit intensity in Upper Yangtze River flow border as the Changjiang river tracer agent, at the conservation substance B of the given unit intensity in upstream flowrate border, Xiang Xi river as Xiang Xi river tracer agent, calculate the spatial and temporal distributions situation of tracer agent in the research period, if in research period zoning the ratio of each point Heavenly Stems and Earthly Branches stream tracer concentration and initial value and be less than 0.9, need the initial period of calculating is passed forward, when the ratio of each point Heavenly Stems and Earthly Branches stream tracer concentration in research period zone and initial value and while being greater than 0.9, and the result of calculation of storage tracer distribution.
By the described method of invention to tributary along the river on the road center line spatial and temporal distributions of each point the Changjiang river tracer agent analyzed, known, at 8km place, distance river mouth, its point downstream all is not less than 60% within the time of selected analysis period 80%, upstream point all is less than 60% within the time of selected analysis period 80%, and this point can be considered the coboundary of the zone of influence, master stream;
In like manner, according to the described method of invention to tributary along the river on the road center line each point mean flow rate added up, known, at 16km place, distance river mouth, in this downstream, all sections are in lake country, and in this upstream, section, do not meet the condition of point in lake country more than 60%, the upstream edge boundary line that this point is lake country during research; At 22km place, distance river mouth, trip at that point, all sections are in the natural river course district, mean flow rate is greater than 0.05m/s in 80% time, and at this lower reache, do not meet the condition of point in the natural river course district more than 60%, the downstream side boundary line that this point is natural river course district during research; Between the upstream edge boundary line of the downstream side boundary line in natural river course district and lake country, it is zone of transition.
To sum up analysis result is known, and in Three Gorges retaining spring at initial stage, tributary, Xiang Xi He Ku gulf hydrodynamic property subregion is as shown in the table:
| The hydrodynamic property partition name | Hekou District | Lake country | Zone of transition | The natural river course district |
| Position (apart from the river mouth distance) | Below 8km | 8km~16km | 16km~22km | More than 22km |
Tributary, Xiang Xi He Ku gulf in spring at retaining initial stage, table 1 gorge hydrodynamic property subregion is table as a result
Hydrodynamic property subregion result is plotted on the Xiang Xi He Ku gulf chlorophyll spatial and temporal distributions figure of this period known (as shown in Figure 3), at different hydrodynamic property subregions, the life of wawter bloom disappears to change obvious difference, the wawter bloom seriousness in Hekou District and natural river course district obviously is weaker than lake country and zone of transition, the duration of lake country is the longest, but peak value is not high; Zone of transition breakout of water bloom Duration Ratio lake country is short, but it is higher to break out peak value.Illustrate that the hydrodynamic property partition method adopted can finely distinguish the ecosystem characterization of zones of different, can take different control measures for the characteristics of zones of different.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (3)
1. gulf, storehouse, river-like reservoir tributary water body hydrodynamic property partition method is characterized in that: comprise the following steps:
(i) adopt numerical method to obtain the Hydrodynamic field in survey region, and the result of calculation of storage of water aerodynamic field;
(ii) respectively on Heavenly Stems and Earthly Branches stream upstream becomes a mandarin border the conservation material of setting unit density be tracer agent, utilize the Hydrodynamic field result of calculation of storage to analyze the spatial and temporal distributions of tracer agent in the gulf, storehouse, if in research period zoning the ratio of each point Heavenly Stems and Earthly Branches stream tracer concentration and initial value and be not more than 0.9, it is too short with research period zero-time interval that explanation selects to calculate the initial period, need pass forward calculating the initial period, when the ratio of each point Heavenly Stems and Earthly Branches stream tracer concentration in research period zone and initial value and while being greater than 0.9, storage tracer agent spatial and temporal distributions result, carry out next step analysis,
(iii) read the tracer agent spatial and temporal distributions result of storage, the CONCENTRATION DISTRIBUTION of each point master stream tracer agent in set period in the statistical computation zone, if the ratio of certain any master stream tracer concentration and master stream tracer concentration initial value in survey region, all be greater than 60% within the time of set period 80%, this point within the research period, in the zone of influence, master stream, otherwise studying in the period not in the zone of influence, master stream by this point;
If (iv) this point, not in the zone of influence, master stream, reads the result of calculation of Hydrodynamic field, the time of adding up this mean flow rate distributes, if all be less than 0.01m/s within the time of set period 80%, this point is being studied in the period in lake country; If this mean flow rate all is greater than 0.01m/s and is not more than 0.05m/s within the time of set period 80%, studying in the period in zone of transition; If this mean flow rate all is greater than 0.05m/s within the time of set period 80%, this point is being studied in the period in the natural river course district;
(v) according to the analysis result of each point, the each point hydraulic performance is sorted out, if in the section of 1km, point more than 60% is arranged all in a hydraulic performance district, can think that this section is all in this hydraulic performance district, statistics can obtain the hydraulic performance subregion result of survey region within the research period piecemeal.
2. gulf, storehouse, river-like reservoir as claimed in claim 1 tributary water body hydrodynamic property partition method, is characterized in that zoning should comprise river-like reservoir master stream and tributary Ku Wan; The computer capacity of reservoir can respectively selected one section with tributary Ku Wan intersection upstream and downstream, and length should be greater than 50 times of depth of waters, thereby improves counting yield.
3. gulf, storehouse, river-like reservoir as claimed in claim 1 tributary water body hydrodynamic property partition method, is characterized in that the master stream conservation material used from the tracer agent in tributary should be different.
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| CN114861571A (en) * | 2022-07-07 | 2022-08-05 | 中国长江三峡集团有限公司 | Dynamic boundary calculation method and device for river channel type reservoir and storage medium |
| CN114860815A (en) * | 2022-07-07 | 2022-08-05 | 中国长江三峡集团有限公司 | Partitioning method, device, equipment and medium for hydrodynamic characteristics of reservoir |
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| CN104504281A (en) * | 2014-12-31 | 2015-04-08 | 天津大学 | River pattern stability discrimination method |
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| CN110442997A (en) * | 2019-08-14 | 2019-11-12 | 中交（天津）生态环保设计研究院有限公司 | It is a kind of for instructing the river mouth waters range demarcation method of river mouth habitat betterment works |
| CN114861571A (en) * | 2022-07-07 | 2022-08-05 | 中国长江三峡集团有限公司 | Dynamic boundary calculation method and device for river channel type reservoir and storage medium |
| CN114860815A (en) * | 2022-07-07 | 2022-08-05 | 中国长江三峡集团有限公司 | Partitioning method, device, equipment and medium for hydrodynamic characteristics of reservoir |
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