CN117196135A - Method and device for adjusting medium diameter flow control rate of sponge city - Google Patents
Method and device for adjusting medium diameter flow control rate of sponge city Download PDFInfo
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Abstract
The application discloses a method and a device for adjusting the medium diameter flow control rate of a sponge city, comprising the following steps: in a sponge city, determining a weighted sum of the regulated volumes within the specific area; determining a marginal cost according to the sum of the inner diameter flow control rate of the specific area and the weighted sum of the regulated volumes; and adjusting the runoff control rate according to the marginal cost, so that the runoff control rate approaches to a preset target value, and the weighted sum of the regulated volumes reaches the minimum value. The application provides a specific method for adjusting the runoff control rate, and adopts a quantitative mathematical expression for description, thereby realizing the effect of conveniently converting into a computer program and carrying out the method in an automatic mode.
Description
Technical Field
The application relates to the field of municipal planning and water supply and drainage, in particular to a method and a device for adjusting the medium diameter flow control rate of a sponge city.
Background
With the rapid development of industrialization, water resources are increasingly in shortage, so that the contradiction between supply and demand of water resources is increased, and water pollution is aggravated. The control index decomposition method (third chapter, fourth section, section 2) is proposed in "construction of sponge urban construction technology guide-low influence development rainwater System (trial)" issued by the living and building department in 10 months 2014 (hereinafter referred to as "guide").
However, this method has the following problems: the lack of a quantitative method for measuring the quality degree of the index decomposition result and the like.
Disclosure of Invention
Aiming at the defects of the existing index decomposition method in the guide, particularly the existing runoff control rate, the application provides an improved method based on the existing method, and provides a method and a device for adjusting the runoff control rate in a sponge city, which can solve the technical problems.
According to one aspect of the application, there is provided a method for adjusting the rate of flow control in a sponge city, the method comprising: in a sponge city, determining a weighted sum of the regulated volumes within the specific area; determining a marginal cost according to the sum of the inner diameter flow control rate of the specific area and the weighted sum of the regulated volumes; and adjusting the runoff control rate according to the marginal cost, so that the runoff control rate approaches to a preset target value, and the weighted sum of the regulated volumes reaches the minimum value.
Preferably, before determining the marginal cost, the method further comprises determining a sum of runoff control rates within the specific area according to the following formula:
wherein C is total C is the sum of the runoff control rates i For the runoff control rate of the land block i in the specific area, A i For the area of land parcel i within the specific area,for a predetermined runoff coefficient, n is the number of plots in the specific area.
Preferably, a weighted sum of the regulated volumes within the specific area is determined according to the following formula:
wherein k is i For the regulation volume weighting coefficient of the land block i, H i Rainfall (corresponding to runoff control rate) is designed for land block i, and other symbols have the same meaning.
Preferably k i The calculation mode of (a) is as follows:
wherein D is i For the effective depth of the sinking green land of the land block i,for the depth of conversion of plot i, f (x i ) Representing the influence of other factors except the depth of the sinking green land on the regulation volume weight;
depth of conversionThe calculation formula of (2) can be taken as
Wherein D is 0 For ineffective depth, D c Is the proposed depth of the concave greenfield.
Preferably, determining the marginal cost includes: determining a first amount of change in the weighted sum of the regulated volumes; determining a second amount of variation of the sum of the runoff control rates; and determining the marginal cost according to the first variation and the second variation.
Preferably, the marginal cost is determined according to the following formula:
wherein,
wherein E is k For the marginal cost, d (V * ) k A first variable, d (C) total ) k Is the sum of the runoff control ratesThe second variation and the other symbols are as defined above.
Preferably, adjusting the runoff control rate according to the marginal cost comprises:
i) Determining a single runoff control rate adjustment Δc k ；
ii) determining the total amount K of the weighted areas of the land areas which are adjusted once;
iii) Calculating a difference DeltaC between the sum of the current runoff control rates and the preset target value total I.e. DeltaC total ＝c total -a target value;
iv) marginal cost for each plotAccording to the arrangement from small to large, the sequenced land block number sequences are set as a (1), a (2), … and a (n) which meet the following requirements
The marginal cost of land block i when the runoff control rate is increased;
at the same time, marginal cost for each landAccording to the arrangement from large to small, the sequenced land block number sequences are b (1), b (2), … and b (n) which satisfy the following
Marginal cost of land block i when runoff control rate is reduced;
v) edge costCounting the first m land parcels with minimum weight areaThe maximum value of m is found so that the following formula holds:
vi) if the sum of the current runoff control rates is higher than the preset target value, then the edge cost is reducedThe largest top p plots are counted and their weighted areas are calculated>The maximum value of p is found so that the following formula holds:
if the current runoff control rate is lower than the preset target value, skipping the step;
vii) checking if the sum of the current runoff control rates is higher than the preset target valueIf the number of the land parcels is not satisfied, indicating that the number of the land parcels which are adjusted in a single time is excessive, and recalculating from the v step after K is reduced;
viii) marginal cost ofMinimum first m plots [ a (1), a (2), …, a (m)]Increase in runoff control rate Δc of (a) k At the same time let marginal cost->Maximum first p plots [ b (1), b (2), …, b (p)]Reducing the runoff control rate Δc of (C) k ；
Looping through i) through viii) until there is no p.gtoreq.1 for any m.gtoreq.0.
Preferably, the operation of determining the weighted sum of the regulated volumes in the specific region, the operation of determining the marginal cost, and the operation of adjusting the runoff control rate are cyclically performed until the runoff control rate approaches a preset target value, and the weighted sum of the regulated volumes is minimized.
According to another aspect of the present application, there is provided an apparatus for adjusting a radius control rate in a sponge city, comprising: a first determining module for determining a weighted sum of the regulated volumes within the specific area in the sponge city; the second determining module is used for determining marginal cost according to the sum of the runoff control rates in the specific area and the weighted sum of the regulated volumes; and the adjustment module is used for adjusting the runoff control rate according to the marginal cost so that the runoff control rate approaches to a preset target value, and the weighted sum of the regulated volumes reaches the minimum value.
Preferably, determining the marginal cost includes: a first determination unit configured to determine a first variation amount of a weighted sum of the regulation volumes in a first determination module; a second determining unit configured to determine a second variation of a sum of the runoff control rates in a second determining module; and determining the marginal cost according to the first variation and the second variation.
The application provides a specific method for adjusting the runoff control rate, and adopts a quantitative mathematical expression for description, so that the method can be conveniently converted into a computer program, and is performed in an automatic mode, thereby realizing the technical effects of improving the urban rainfall flood management and the reclaimed water utilization level, relieving the urban water shortage pressure, improving the water environment, moderately utilizing water resources and comprehensively reading the water ecology of the new city.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a flow chart of a method for adjusting the rate of radial flow control in a sponge city according to an embodiment of the application;
FIG. 2 is a flowchart of a method for adjusting the diameter flow control rate in a sponge city according to an embodiment of the present application;
fig. 3 is a block diagram of a device for adjusting the flow rate of medium diameter flow in a sponge city according to an embodiment of the present application.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
Reference will now be made in detail to the various embodiments of the application, examples of which are illustrated in the accompanying drawings and described below. For convenience in explanation and accurate definition in the appended claims, the terms "upper", "lower", "inner" and "outer" are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures.
The application provides a method for adjusting the medium diameter flow control rate of a sponge city, which comprises the following steps: in a sponge city, determining a weighted sum of the regulated volumes within the specific area; determining a marginal cost according to the sum of the inner diameter flow control rate of the specific area and the weighted sum of the regulated volumes; and adjusting the runoff control rate according to the marginal cost, so that the runoff control rate approaches to a preset target value, and the weighted sum of the regulated volumes reaches the minimum value.
In the related art, a method for quantitatively adjusting the medium diameter flow control rate of a sponge city is lacking. In the embodiment of the application, the weighted sum of the storage volumes is used as a quantification index for evaluating the decomposition results of different indexes, a specific method for optimizing and adjusting the decomposition of the index is provided, and a quantified mathematical expression is adopted for description, so that the technical problems in the related technology are solved.
According to an embodiment of the application, before determining the marginal cost, the method further comprises determining a sum of runoff control rates within the specific area according to the following formula:
wherein C is total C is the sum of the runoff control rates i For the runoff control rate of the land block i in the specific area, A i For the area of land parcel i within the specific area,for a predetermined runoff coefficient, n is the number of plots in the specific area.
According to an embodiment of the application, a weighted sum of the regulated volumes within the specific area is determined according to the following formula:
wherein k is i For the regulation volume weighting coefficient of the land block i, H i Rainfall (corresponding to runoff control rate) is designed for land block i, and other symbols have the same meaning.
k i The calculation mode of (a) is as follows:
wherein D is i For the effective depth of the sinking green land of the land block i,for the depth of conversion of plot i, f (x i ) Representing the influence of other factors except the depth of the sinking green land on the regulation volume weight;
depth of conversionThe calculation formula of (2) can be taken as
Wherein D is 0 For ineffective depth, D c Is the proposed depth of the concave greenfield.
The adjustment method provides the weighted sum of the storage volumes as the quantitative index for evaluating the decomposition results of different indexes, so that the quality comparison among different schemes can be carried out, and the scheme optimization is facilitated.
According to an embodiment of the application, determining the marginal cost comprises: determining a first amount of change in the weighted sum of the regulated volumes; determining a second amount of variation of the sum of the runoff control rates; determining the marginal cost according to the first variation and the second variation, wherein the formula is as follows:
wherein,
wherein E is k For the marginal cost, d (V * ) k A first variable, d (C) total ) k The other symbols are as above for the second variation of the sum of the runoff control rates.
The application defines the ratio of the first variable quantity of the weighted sum of the storage volumes to the second variable quantity of the sum of the runoff control rates as the marginal cost during the runoff control adjustment of the single land parcels, and measures the efficiency of the runoff control rates formed among different land parcels, so that the runoff control rates of all land parcels can be adjusted in a quantitative mode.
According to an embodiment of the present application, adjusting the runoff control rate according to the marginal cost includes:
i) Determining a single runoff control rate adjustment Δc k ；
ii) determining the total amount K of the weighted areas of the land areas which are adjusted once;
iii) Calculating a difference DeltaC between the sum of the current runoff control rates and the preset target value total I.e. DeltaC total ＝C total -a target value;
iv) marginal cost for each plotAccording to the arrangement from small to large, the sequenced land block number sequences are set as a (1), a (2), … and a (n) which meet the following requirements
The marginal cost of land block i when the runoff control rate is increased;
at the same time, marginal cost for each landAccording to the arrangement from large to small, the sequenced land block number sequences are b (1), b (2), … and b (n) which satisfy the following
Marginal cost of land block i when runoff control rate is reduced;
v) edge costCounting the first m land parcels with minimum weight areaThe maximum value of m is found so that the following formula holds:
vi) if the sum of the current runoff control rates is higher than the preset target value, then the edge cost is reducedThe largest top p plots are counted and their weighted areas are calculated>The maximum value of p is found so that the following formula holds:
if the sum of the current runoff control rates is lower than the preset target value, skipping the step;
vii) checking if the sum of the current runoff control rates is higher than the preset target valueIf the number of the land parcels is not satisfied, indicating that the number of the land parcels which are adjusted in a single time is excessive, and recalculating from the v step after K is reduced;
viii) marginal cost ofMinimum first m plots [ a (1), a (2), …, a (m)]Increase in runoff control rate Δc of (a) k At the same time let marginal cost->Maximum first p plots [ b (1), b (2), …, b (p)]Reducing the runoff control rate Δc of (C) k ；
Looping through i) through viii) until there is no p.gtoreq.1 for any m.gtoreq.0.
The application provides a specific method for adjusting the runoff control rate, which can ensure that the runoff control rate reaches a target value in the adjustment process, reduce the total cost and ensure the effectiveness and the calculation efficiency of a calculation result.
According to an embodiment of the present application, the operation of determining the weighted sum of the regulated volumes within the specific area, the operation of determining the marginal cost, and the operation of adjusting the runoff control rate are performed in a loop until it is satisfied that none of the plots can be adjusted, i.e., the runoff control rate approaches a preset target value, the weighted sum of the regulated volumes reaches a minimum.
The application also provides a device for adjusting the medium diameter flow control rate of the sponge city, which comprises: a first determining module for determining a weighted sum of the regulated volumes within the specific area in the sponge city; the second determining module is used for determining marginal cost according to the sum of the runoff control rates in the specific area and the weighted sum of the regulated volumes; and the adjustment module is used for adjusting the runoff control rate according to the marginal cost so that the runoff control rate approaches to a preset target value, and the weighted sum of the regulated volumes reaches the minimum value.
The adjusting device can overcome the defect that the quantitative method for measuring the index decomposition result is lacking in the current guide.
According to an embodiment of the application, determining the marginal cost comprises: a first determination unit configured to determine a first variation amount of a weighted sum of the regulation volumes in a first determination module; a second determining unit configured to determine a second variation of a sum of the runoff control rates in a second determining module; and determining the marginal cost according to the first variation and the second variation.
The adjustment device defines the ratio of the first variable of the weighted sum of the storage volumes to the second variable of the sum of the runoff control rates as a "marginal cost" for individual plot runoff control adjustment, so that the runoff control rates can be adjusted in a quantitative manner.
The following examples are given for the purpose of illustration only and are not intended to limit the embodiments of the application. Various other changes, modifications, substitutions, and alterations herein will become apparent to those skilled in the art without departing from the spirit and scope of the application as defined by the appended claims.
The embodiment of the application provides a method for adjusting the medium diameter flow control rate of a sponge city, which can be used for optimizing the planning construction of the sponge city in a specific city. As shown in fig. 2, the method specifically comprises the following steps:
firstly, collecting a land block dividing map of a planning area and land utilization type data; satellite image maps, urban green space planning data and the like can be collected according to conditions.
And secondly, determining a total annual runoff control rate target proposed in the urban overall planning stage.
Thirdly, classifying land parcels according to land utilization types, and setting the proportion of the area of the underlying surface (namely the area ratio of green land, roof and pavement) corresponding to each land type and the initial value of sponge control indexes (namely runoff control rate, sinking green land rate, green roof rate, water permeable pavement rate, other regulation and storage volume and the like); and adjusting the related indexes of the land according to the current situation of the area reflected by the satellite image map, urban green space planning and other data.
And step four, calculating the runoff coefficient of each land block in the planning range according to a method in the guideline, wherein the section 2.1 of the eighth section of the fourth chapter can be seen.
And fifthly, calculating the sum of the current runoff control rates of the areas according to the runoff control rates, the areas and the runoff coefficients of the land plots as shown in the formula.
And sixthly, calculating a weighted sum of the regulated volumes in the area according to the regulated volume weighting coefficient of the land block i, the design rainfall capacity of the land block i and the area of the land block i, wherein the weighted sum is determined in advance according to the radial flow coefficient as shown in the formula.
Seventh, assume that the runoff control rate of land block k is changed by a unit amount dC k (e.g., 5%), the sum of the runoff control rates may be recalculated in accordance with the formula in the fifth step and the amount of change in the sum of the runoff control rates may be calculated, and in this case, the weighted sum of the regulated volumes may be recalculated and the amount of change in the weighted sum of the regulated volumes may be calculated.
Define the ratio of the two to be E k That is, the value represents the marginal cost when the runoff control rate of the plot changes, and the formula is as described above.
In particular, since the runoff control rate is generally discontinuous in actual planning, when the runoff control rate increases or decreases, the calculation result of the marginal cost is generally different, and calculation should be performed separately. Let the marginal cost of land block i when the runoff control rate increases beThe marginal cost at the time of reduction is +.>
And eighth, optimizing and adjusting the runoff control rate of the land parcels. By increasing the runoff control rate for plots with smaller marginal costs while decreasing the runoff control rate for plots with greater marginal costs, the sum of the runoff control rates can be kept constant or more nearly the target value while the weighted sum of the regulated volumes is decreased. The specific method comprises the following steps:
i) Determining a single runoff control rate adjustment Δc k ；
ii) determining the total amount K of the weighted areas of the land areas which are adjusted once;
iii) Calculating the currentDifference deltac between the sum of runoff control rates and target value total I.e. DeltaC total ＝C total -a target value.
iv) marginal cost for each plotAccording to the arrangement from small to large, the sequenced land block number sequences are set as a (1), a (2), … and a (n) which meet the following requirements
At the same time, marginal cost for each landAccording to the arrangement from large to small, the sequenced land block number sequences are b (1), b (2), … and b (n) which satisfy the following
v) edge costCounting the first m land parcels with minimum weight areaThe maximum value of m is found so that the following formula holds:
vi) if the sum of the current runoff control rates is higher than the target value, then the cost is marginalThe largest top p plots are counted and their weighted areas are calculated>The maximum value of p is found so that the following formula holds:
if the sum of the current runoff control rates is lower than the target value, skipping the step;
vii) in case the sum of the current runoff control rates is higher than the target value, checking whether or not it is satisfiedIf the number of the land parcels which are adjusted once is not satisfied, the number of the land parcels which are adjusted once is excessive, and the number of the land parcels which are adjusted once is reduced, and then the land parcels are recalculated from the v step;
viii) marginal cost ofMinimum first m plots [ a (1), a (2), …, a (m)]Increase in runoff control rate Δc of (a) k At the same time let marginal cost->Maximum first p plots [ b (1), b (2), …, b (p)]Reducing the runoff control rate Δc of (C) k And finishing one-time optimization adjustment.
And a ninth step, repeating the fourth step to the eighth step until no land block can be adjusted in the eighth step, namely, p is not less than 1 for any m is not less than 0, and the eighth steps vi and vii are satisfied, namely, the optimization adjustment process for the runoff control rate is completed.
And tenth, performing other calculation processes except optimization and adjustment of the runoff control rate according to the steps and the description in the guideline.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The method for adjusting the medium diameter flow control rate of the sponge city is characterized by comprising the following steps of:
in a sponge city, determining a weighted sum of the regulated volumes within the specific area;
determining a marginal cost according to the sum of the inner diameter flow control rate of the specific area and the weighted sum of the regulated volumes;
and adjusting the runoff control rate according to the marginal cost, so that the runoff control rate approaches to a preset target value, and the weighted sum of the regulated volumes reaches the minimum value.
2. The method of claim 1, wherein prior to determining the marginal cost, the method further comprises: the sum of the runoff control rates in the specific area is determined according to the following formula:
wherein C is total C is the sum of the runoff control rates i For the runoff control rate of the land block i in the specific area, A i For the area of land parcel i within the specific area,for a predetermined runoff coefficient, n is the number of plots in the specific area.
3. The method according to claim 1, characterized in that a weighted sum of the regulated volumes within the specific area is determined according to the following formula:
wherein k is i For the regulation volume weighting coefficient of the land block i, H i Rainfall (corresponding to runoff control rate) is designed for land block i, and other symbols have the same meaning.
4. A method according to claim 3, characterized in that k i The calculation mode of (a) is as follows:
wherein D is i For the effective depth of the sinking green land of the land block i,for the depth of conversion of plot i, f (x i ) Representing the influence of other factors except the depth of the sinking green land on the regulation volume weight;
depth of conversionThe calculation formula of (2) can be taken as
Wherein D is 0 For ineffective depth, D c Is the proposed depth of the concave greenfield.
5. The method of claims 1-4, wherein determining the marginal cost comprises:
determining a first amount of change in the weighted sum of the regulated volumes;
determining a second amount of variation of the sum of the runoff control rates;
and determining the marginal cost according to the first variation and the second variation.
6. The method of claim 5, wherein the marginal cost is determined according to the following formula:
wherein,
wherein E is k For the marginal cost, d (V * ) k A first variable, d (C) total ) k The other symbols are as above for the second variation of the sum of the runoff control rates.
7. The method of claim 6, wherein adjusting the runoff control rate according to the marginal cost comprises:
i) Determining a single runoff control rate adjustment Δc k ；
ii) determining the total amount K of the weighted areas of the land areas which are adjusted once;
iii) Calculating a difference DeltaC between the sum of the current runoff control rates and the preset target value total I.e. DeltaC total ＝C total -a target value;
iv) marginal cost for each plotAccording to the arrangement from small to large, the sequenced land block number sequences are set as a (1), a (2), … and a (n) which meet the following requirements
The marginal cost of land block i when the runoff control rate is increased;
at the same time, marginal cost for each landAccording to the arrangement from big to small, the sequenced land block number sequences are set as b (1), b (2), and b (n) which meet the requirements of
Marginal cost of land block i when runoff control rate is reduced;
v) edge costCounting the first m land parcels, and calculating the weighted area +.>The maximum value of m is found so that the following formula holds:
vi) if the sum of the current runoff control rates is higher than the preset target value, then the edge cost is reducedThe largest top p plots are counted and their weighted areas are calculated>The maximum value of p is found so that the following formula holds:
if the sum of the current runoff control rates is lower than the preset target value, skipping the step;
vii) checking if the sum of the current runoff control rates is higher than the preset target valueIf the number of the land parcels is not satisfied, indicating that the number of the land parcels which are adjusted in a single time is excessive, and recalculating from the v step after K is reduced;
viii) marginal cost ofMinimum first m plots [ a (1), a (2), -a (m)]Increase in runoff control rate Δc of (a) k At the same timeLet marginal cost->Maximum first p plots [ b (1), b (2), -b (p)]Reducing the runoff control rate Δc of (C) k ；
Looping through i) through viii) until there is no p.gtoreq.1 for any m.gtoreq.0.
8. The method according to claims 1 to 4, characterized in that the operations of determining a weighted sum of the regulated volumes in the specific area, determining the marginal cost and adjusting the runoff control rate are performed cyclically until the runoff control rate approaches a preset target value, the weighted sum of the regulated volumes being minimized.
9. An adjusting device of diameter flow control rate in sponge city, characterized by comprising:
a first determining module for determining a weighted sum of the regulated volumes within the specific area in the sponge city;
the second determining module is used for determining marginal cost according to the sum of the runoff control rates in the specific area and the weighted sum of the regulated volumes;
and the adjustment module is used for adjusting the runoff control rate according to the marginal cost so that the runoff control rate approaches to a preset target value, and the weighted sum of the regulated volumes reaches the minimum value.
10. The apparatus of claim 9, wherein determining the marginal cost comprises:
a first determination unit configured to determine a first variation amount of a weighted sum of the regulation volumes in a first determination module;
a second determining unit configured to determine a second variation of a sum of the runoff control rates in a second determining module;
and determining the marginal cost according to the first variation and the second variation.
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