CN107368623B - Regulation and storage tank volume determination method based on runoff pollution control - Google Patents
Regulation and storage tank volume determination method based on runoff pollution control Download PDFInfo
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/663—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters by measuring Doppler frequency shift
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Abstract
The invention discloses a regulation and storage tank volume determination method based on runoff pollution control, which comprises the steps of selecting a typical rainfall event to obtain the time-varying process of rainfall; monitoring to obtain the change process of rainfall runoff flow along with time; sampling pollutants to obtain the change process of the water quality of rainfall flowing through a rainwater pipeline along with the sampling time; calculating to obtain the change relation of rainfall runoff pollution load along with time and a runoff pollution reduction rate related equation of rainfall and each pollution index; calculating to obtain power function relation formulas of rainfall and runoff pollution reduction rates of different runoff pollution reduction rate values and a plurality of regulated storage amounts D; and for any rainfall event, obtaining a runoff pollution reduction rate relation table corresponding to a plurality of regulated storage amounts D and a corresponding relation table of the calculation parameters of the capacity of the regulating storage tank and the runoff pollution reduction rate, and obtaining a relation table of the capacity of the regulating storage tank and the runoff pollution reduction rate. The invention relates to a method for calculating the volume of a storage tank for controlling runoff pollution, which is more accurate, simple and applicable.
Description
Technical Field
The invention relates to the technical field of rainwater storage tank volume calculation, in particular to a rainwater storage tank volume calculation method based on runoff pollution control, which is mainly applied to a split-flow rainwater drainage system.
Background
Along with the rapid development of urbanization, the ratio of the waterproof underlying surface of a city is continuously increased, the precipitation runoff producing coefficient is continuously improved, the urban surface runoff producing speed is increased, the runoff flow and the peak value are increased when rainfall occurs, and the urban water environment problems such as unsmooth drainage of a rainwater pipe network system, urban waterlogging and the like are easily caused. In addition, due to the aggravation of urban non-point source pollution, urban rainfall runoff carries a large amount of pollutants including solid particles, organic pollutants, nutrient salts, heavy metals, oils and the like by scouring urban underlying surfaces (roads, roofs, greenbelts, parking lots and the like), and the types of the pollutants carried by the urban rainfall runoff almost cover all aspects of the current water quality monitoring pollutants.
According to the estimation, the runoff pollution load in China can reach 35% -55% of the total pollution load generally, individual areas can even reach 65% -75%, particularly in southern areas of China, rainfall is sufficient, urban rivers are dense, rainwater carries a large amount of pollutants into surface water bodies, the phenomenon of river eutrophication is serious, the river water is black and odorous, the sanitary conditions are extremely bad, and some urban rivers even become overground 'blow-off pipes' of cities, the environmental aspect of the whole city is influenced, and the life of surrounding residents is even influenced. Therefore, the measures for enhancing the runoff pollution control have become an important problem in urban scientific planning and construction, and the technical guidance for sponge urban construction (trial) released by the ministry of residence and construction in 2014 10 months proposes that the runoff pollution control target should be considered as a selective control target for urban development while realizing planning control targets such as urban rainfall runoff total amount control, runoff peak value control, rainwater resource utilization and the like.
At present, a split-flow rainwater storage tank for controlling rainfall runoff pollution functions mainly adopts an empirical formula method and a model calculation method, wherein the calculation methods are more applied and have larger influence. The resulting solution will be more accurate if a hydrological model is used, but the parameters in this model are less operational and there is no simple guideline that is suitable for this purpose. A calculation formula which is recommended in the outdoor drainage design Specification (GB50014-2006) of China and is suitable for controlling the runoff pollution storage tank in the split-flow system adopts an empirical formula form. Its advantages are simple process, less needed data and wide application range. The value of the storage quantity D of the important parameter calculated by the volume of the rainwater storage tank in the standard formula is very subjective and is obtained mainly by experience.
Disclosure of Invention
The invention aims to solve the problem that the important parameter storage amount D of the existing split-flow rainwater storage tank volume calculation formula for controlling rainfall runoff pollution takes a value according to experience, and the parameter storage amount D determination method can be more accurately obtained through experiments, so that the storage tank volume can exert better economic and environmental benefits.
The volume of the storage tank for controlling the runoff pollution is related to the rainfall intensity of a typical rainfall event in an area, the rainfall runoff water amount, the rainfall runoff pollution, the underlying surface characteristics and the pipeline parameters. For the region, the characteristics of the underlying surface and the pipeline parameters are determined. Therefore, for a specific area, specific underlying surface characteristics and pipeline parameters, the main factors influencing the volume of the storage tank are rainfall intensity, rainfall runoff water volume and rainfall runoff pollution of a typical rainfall event. Through monitoring the whole drainage process of rainfall runoff in a research area under a typical rainfall event, analyzing the runoff flow change characteristics of the rainwater pipeline, the influence of the rainfall characteristics on the runoff flow of the rainwater pipeline and the correlation analysis of rainfall and runoff. The influence of rainfall runoff pollution change characteristics and rainfall characteristics on rainfall runoff pollution is analyzed by sampling the whole discharge process of the rainfall runoff pollution in a research area under a typical rainfall event. The selection method of the regulation and storage pool calculation parameter regulation and storage quantity D can be obtained by estimating rainfall runoff pollution load under a typical rainfall event and analyzing the relation between rainfall capacity and runoff pollution reduction rate.
The invention is realized by the following technical scheme.
The invention relates to a regulation and storage tank volume determination method based on runoff pollution control, which comprises the following steps:
step 1: selecting typical rainfall events, and counting effective rainfall events to obtain a statistical value of the change process of rainfall in each rain along with time;
step 2: simultaneously, monitoring the rainfall runoff flow by adopting a Doppler ultrasonic pipeline flowmeter to obtain a monitoring value of the change process of the rainfall runoff flow along with time;
and step 3: sampling and analyzing pollutants of rainwater flowing through a rainwater pipeline in the full rainfall process of the rainfall event according to a certain time interval to obtain a change process monitoring value of the water quality of each pollution index of rainfall runoff along with the sampling time;
and 4, step 4: according to the results of the step 2-3, calculating by using a calculation formula (I) of the runoff pollution load to obtain the change relation of the rainfall runoff pollution load with time under different rainfall events;
and 5: root of herbaceous plantAccording to the change process statistic of rainfall along with time in each rainfall event obtained in the step 1 and the change relation of rainfall runoff pollution load along with time under different rainfall events obtained in the step 4, the runoff pollution reduction rate formula (II) is utilized to obtain the correlation between the rainfall along with time in the rainfall event and the runoff pollution reduction rate of each pollution index, and power function fitting analysis is carried out on the correlation to obtain a correlation equation and a correlation coefficient R2；
Step 6: calculating to obtain different runoff pollution reduction rate values according to the correlation relationship between the rainfall amount changing along with time in the rainfall event and the runoff pollution reduction rate of each pollution index, and performing power function fitting on the runoff pollution reduction rate values and the rainfall amount values under each rainfall event again to obtain a power function relation of the rainfall amount under the regulated storage amount D and the runoff pollution reduction rate;
and 7: repeating the steps 5-6 to obtain a power function relation of rainfall and runoff pollution reduction rate of a plurality of regulated storage amounts D;
and 8: aiming at the rainfall in any rainfall event, obtaining a runoff pollution reduction rate relation table corresponding to a plurality of regulated quantities D according to the power function relation of the rainfall and the runoff pollution reduction rate of the regulated quantities D obtained in the step 7, and calculating by using an interpolation method to obtain a corresponding relation selection table of any regulated quantity D and the runoff pollution reduction rate under the rainfall;
and step 9: and (3) obtaining a table for selecting the corresponding relation of the comprehensive runoff coefficient psi of the catchment area of the regulating and storing tank, the catchment area F, the regulating and storing amount D and the runoff pollution reduction rate according to a regulating and storing tank volume calculation formula (III) in the specification, and calculating to obtain a relation table of the regulating and storing tank volume and the runoff pollution reduction rate.
Further, in the step 1, five typical rainfall events, namely light rain, medium rain, heavy rain and heavy rain, are selected, and at least 5 effective rainfall events are counted.
Further, sampling and analyzing pollutants of rainwater flowing through a rainwater pipeline in the full rainfall process of the rainfall event according to the time interval of 1 hour.
The method for determining the volume of the regulation and storage pool based on the runoff pollution control has the advantages that on the basis of a calculation formula in outdoor drainage design specifications used in China, according to rainfall change, rainfall runoff pollution change and rainfall runoff load change of a typical rainfall event, the relation between the rainfall and the runoff pollution reduction rate is determined, the selection standard of an important parameter, namely 'regulation amount D', is further determined, the method is obtained by utilizing an interpolation method, a table is selected according to the corresponding relation between any regulation amount and the runoff pollution reduction rate under a certain rainfall, and a relation table between the volume of the regulation and the SS pollutant reduction rate is finally obtained according to the calculation formula of the volume of the regulation and storage pool in the specifications.
The metering method does not adopt experience value, and establishes a more accurate, simple and applicable calculation method for controlling the volume of the runoff pollution storage tank by carrying out whole-process analysis on the runoff pollution load change process of a typical rainfall event.
Drawings
FIG. 1 is a flow chart of a method of determining the volume of a storage tank of the present invention;
FIG. 2(a) and FIG. 2(b) are diagrams showing the variation of rainfall intensity and pipeline flow rate in a rainfall event according to the embodiment;
FIGS. 3(a) and 3(b) are graphs showing the pollution concentrations of SS, COD, TN and TP in examples respectively as a function of sampling time;
FIG. 4(a) and FIG. 4(b) are graphs showing the change of rainfall runoff pollution load of examples SS, COD, TN and TP, respectively.
Detailed Description
The invention will now be described and illustrated in detail by way of specific examples to provide a better understanding of the invention, but it should be understood that the following examples are not intended to limit the scope of the invention.
As shown in fig. 1, the method for determining the volume of the storage tank based on the runoff pollution control of the invention comprises the following steps:
step 1: selecting five typical rainfall events of light rain, medium rain, heavy rain and heavy rain, and counting at least 5 effective rainfall events to obtain a time-varying change process statistical value of rainfall in each rain.
Step 2: simultaneously, monitoring the rainfall runoff flow by adopting a Doppler ultrasonic pipeline flowmeter to obtain a monitoring value of the change process of the rainfall runoff flow along with time;
obtained by the following formula:
Q＝V*S
wherein Q is rainfall runoff flow, m3S; v is the flow speed of the rainwater pipeline, m/s; s is the area of the cross section of the rainwater flow of the rainwater pipeline, m2。
And step 3: and sampling and analyzing pollutants of rainwater flowing through a rainwater pipeline in the full rainfall process of the rainfall event at intervals of 1 hour to obtain a change process monitoring value of rainfall runoff water quality along with sampling time.
And 4, step 4: according to the results of the step 2-3, according to the analysis of rainfall runoff and pollution change characteristics in 22 typical rainfall events, the pollutant concentration, runoff flow data and rainfall data of the rainfall runoff are matched in time, and the change relation of the rainfall runoff pollution load under different rainfall events along with the time is calculated by using a calculation formula (I) of the runoff pollution load;
in the formula, M is runoff pollution load generated by rainfall in the field, and g; ctProducing an instantaneous concentration at t, mg/L, for the rainfall in the field; qtProducing an instantaneous flow at t, m, for the rainfall of the field3S; delta t is the sampling interval time of the rainfall in the field, s; t is the duration of rainfall of the rainfall in the field, s; t is the total rainfall duration of the rainfall in the field, s.
And 5: selecting an important parameter 'storage quantity D', including selecting a storage quantity D (in terms of rainfall), obtaining the correlation between the rainfall changing along with time in the rainfall event and the runoff pollution reduction rate of each pollution index according to the statistical value of the change process of the rainfall along with time in each rainfall event obtained in the step 1 and the change relation of the rainfall runoff pollution load along with time in different rainfall events obtained in the step 4, and performing power function fitting analysis on the correlation to obtain the correlationCorrelation equation and correlation coefficient R2。
Wherein, the runoff pollution reduction rate is the percentage of the runoff pollution load amount which can be stored in the regulation and storage pool to the total runoff pollution load amount generated by the rainfall, and the calculation formula is as follows:
in the formula, MtG, runoff pollution load generated when the rainfall of the field experiences t; mTG, runoff pollution load generated by the rainfall in the total rainfall duration of the field; t is rainfall duration, s; t is total rainfall duration, s; p is runoff pollution reduction rate,%; ctProducing an instantaneous concentration at t, mg/L, for the rainfall in the field; qtProducing an instantaneous flow at t, m, for the rainfall of the field3/s。
In step 5, the correlation equation is as follows:
Y1＝aX1 b
in the formula, Y1Runoff pollution reduction rate,%, which is each pollution index; x1Is the amount of rainfall, mm, in the event of rainfall, which varies with time; a is a correlation equation coefficient; b is a correlation equation index.
Step 6: according to the correlation relationship between the rainfall amount changing along with the time in the rainfall event and the runoff pollution reduction rate of each pollution index, different runoff pollution reduction rate values are obtained through calculation, and power function fitting is carried out on the runoff pollution reduction rate values and the rainfall amount values under each rainfall event again to obtain a power function relationship formula of the rainfall amount under the regulated storage amount D and the runoff pollution reduction rate, wherein the power function relationship formula comprises the following steps:
Y2＝aX2 b
in the formula, Y2Runoff pollution reduction rate,%, which is each pollution index; x2The rainfall is mm under the storage regulation quantity D; a is a correlation equation coefficient; b is a correlation equation index.
And 7: and selecting a plurality of D, and repeating the steps 5-6 to obtain a power function relation of rainfall and runoff pollution reduction rate of the plurality of regulated storage amounts D.
And then calculating the volume of the regulating storage tank for controlling the runoff pollution.
And 8: and (4) aiming at the rainfall in any rainfall event, obtaining a runoff pollution load rate relation table corresponding to the plurality of regulated quantities D according to the power function relation of the rainfall and the runoff pollution reduction rate of the plurality of regulated quantities D obtained in the step (7), and calculating by using an interpolation method to obtain a corresponding relation selection table of any regulated quantity D and the runoff pollution reduction rate under the rainfall.
And step 9: calculating formula (III) according to the regulation pool volume in the specification:
according to the calculation formula in the design Specification of outdoor drainage
V＝10DFΨβ (III)
In the formula: v is the effective tank volume of the storage tank, m3(ii) a D is the storage amount, and is measured according to rainfall; f-catchment area, hm2β is safety factor and psi is comprehensive runoff coefficient.
And selecting a table according to the corresponding relation of the comprehensive runoff coefficient psi of the catchment area of the regulating and storing tank, the catchment area F, the regulating and storing amount D and the runoff pollution reduction rate, and calculating to obtain a relation table of the capacity of the regulating and storing tank and the runoff pollution reduction rate.
The present invention will be described in further detail below with reference to specific examples.
Take the ring garden area in the main city area of Yixing city as an example:
step 1: method for determining calculation parameters of volume of storage tank for runoff pollution control
The areas of various underlying surfaces within the catchment area of each storage tank in the two arrangements of the rainwater storage tanks are determined by using Google Earth and field investigation, and the results are shown in Table 1.
TABLE 1 scheme underlying surface statistics
According to the areas of various underlying surfaces and runoff coefficients of various underlying surfaces in the table 5.6 (shown in the table 2.2), the catchment area F of the storage tank is 334.6ha, the comprehensive runoff coefficient psi is 0.73, and the safety coefficient β is 1.2.
Step 2: the relationship between rainfall and runoff pollution reduction rate comprises
1) Rainfall runoff flow change process analysis
The study monitored 5 total rainfall events from 5 to 10 months in 2016 as a typical rainfall event, the basic characteristics of five typical rainfalls, as shown in table 2.
TABLE 2 basic characteristics of rainfall events
In order to more intuitively express the rainfall characteristics under five typical rainfall events and the change rule of the rainfall runoff flow of the rainfall runoff, the rainfall original data monitored by the rain gauge and the water level and flow rate original data monitored by the pipeline flow meter are processed by EXCEL to obtain rainfall intensity and pipeline flow data. And then originpro8.0 is used for drawing a change process diagram of rainfall intensity and pipeline flow under the rainfall event, as shown in fig. 2(a) and 2 (b). From the overall change of the pipeline flow, the change trend, the change frequency and the rainfall intensity change are consistent, except that the change of the pipeline flow lags behind the change of the rainfall intensity for a period of time and is longer than the duration of the rainfall intensity for a period of time.
2) Analysis of rainwater quality change process of rainwater pipeline
In the research, 5 times of rainfall water samples in the whole process are taken from 5 months to 10 months in 2016, and each sampling covers the whole process of runoff discharge. In order to express the change process of the pollutants more intuitively, a corresponding statistical table is formulated for the initial and stable concentrations of the pollutants in the rainfall runoff pipeline, and the statistical table is shown in table 3.
TABLE 3 statistical table of rainwater pollutant concentrations
A graph of pollution concentration of various indexes SS, COD, TN and TP in the rainfall runoff pipeline along with sampling time is drawn by originPro8.5, and is shown in a graph in fig. 3(a) and a graph in fig. 3 (b). By comparing the change processes of various pollutants in rainfall runoff pipelines under different rainfall events, the change trends of the concentrations of various pollution indexes are basically the same: in the pollutant discharging process, along with the continuous increase of rainfall, the concentration of each pollutant is reduced in a sawtooth shape, and a plurality of wave crests with different quantities appear in the concentration of each pollutant in the reducing process.
3) Analyzing the change of rainfall runoff load with time according to the results of 1) to 2)
According to the calculation formula (5-1) of the runoff pollution load, investigation data of the water quality and water quantity of the runoff water in the research area and rainfall characteristic data, the change process of the rainfall runoff pollution load of each analysis index under different rainfall events is estimated, and is shown in fig. 4(a) and 4 (b). Although the pollutant concentration in the middle stage of rainfall is reduced to be stable, the pollution load of each index is not reduced, even is larger than that in the early stage of rainfall, and a plurality of peak values also appear, because the rainfall intensity in the later stage of sampling appears a peak, the ground scouring capability is increased, and the runoff pollution discharge amount is increased. Different from the peak value of the pollutant concentration change process, the pollution load peak value may exceed the load peak value in the early stage of rainfall, the positions of the peaks and the troughs in the change process of each index load are very close in time, and the number of the peaks is almost the same. Although the pollutant concentration is gradually reduced from high in the early stage of rainfall, the pollution load of each index is mainly concentrated in the middle stage of rainfall. In the early and later periods of rainfall, the water quality load is not very large and is relatively low.
4) Relationship between rainfall and runoff pollution reduction rate
The relationship between rainfall and runoff pollution reduction rate for five typical rainfall conditions was fitted according to a power function, as shown in table 4. Coefficient of dependence R of rainfall on SS pollution reduction rate2In the range of 0.8904-0.9716, and a coefficient R of correlation between rainfall and COD pollution reduction rate2In the range of 0.8790-0.9741, and a coefficient R of correlation between the rainfall and the TN pollution reduction rate2In the range of 0.8378-0.9886, and the coefficient of correlation between the rainfall and the TP pollution reduction rateR2The range of (A) is 0.9056 to 0.9608. Therefore, the rainfall is obviously related to the pollution reduction rates of SS, COD, TN and TP, and even highly related, and an important basis is provided for the design and calculation of the volume of the storage tank.
TABLE 4 correlation of rainfall and pollution reduction rate of each index under different rainfall conditions
And step 3: the selection criteria of the important parameter "regulated storage quantity D" include
1) When the storage quantity D is 3mm, respectively obtaining 5 different runoff pollution reduction rate values corresponding to the storage quantity according to the power function relationship between the runoff pollution reduction rate and the rainfall of each pollution index under the condition of five typical rainfalls in Yixing city, and performing power function fitting on the 5 different runoff pollution reduction rate values and the rainfall value of five rainfall events to obtain a power function fitting curve of the pollution reduction rate and the rainfall of each index under the storage quantity;
2) when the storage quantity D is selected from 6mm, 9mm, 12mm and 15mm, the power function relation of rainfall and runoff pollution reduction rate of a plurality of storage quantities D can be obtained by repeating the previous steps, and the power function equation and correlation coefficient of the pollution reduction rate and rainfall of each index under 5 types of storage quantities are shown in table 5. The power function correlation coefficient R of the rainfall of 5 types of regulated storage amounts and the pollution reduction rate of each index can be found2Basically more than 0.9, has obvious correlation and high use value, and is used as the basis for analyzing the relation between the storage regulation amount and the runoff pollution reduction rate.
TABLE 55 kinds of correlations between the storage capacity, rainfall and pollution reduction rate of each index
And 4, step 4: regulation and storage tank volume calculation for runoff pollution control
When the rainfall in a certain pleasure place is 15mm, the runoff pollution load rate which can be achieved by the 5 types of regulation and storage amounts is shown in table 6.
TABLE 6 pollution abatement rate values for each index of 5 kinds of regulated storage capacity when rainfall is 15mm
According to the corresponding relation between the 5 types of regulated quantities and the SS pollution reduction rate in the table 6, a table is selected according to the corresponding relation between any regulated quantity and the runoff pollution reduction rate under the rainfall by using an interpolation method, and the table is shown in the table 7.
TABLE 7 relationship table of the regulated storage volume D and SS runoff pollution reduction rate
According to a regulation pool volume calculation formula (I) in the specification, a relation (shown in a table 7) of a comprehensive runoff coefficient psi, a catchment area, a regulation amount D and a runoff pollution reduction rate of a regulation pool catchment area is calculated to obtain a relation table of the regulation pool volume and the SS pollutant reduction rate, and the relation table is shown in a table 8.
TABLE 8 relationship between reservoir volume and contaminant reduction rate
On the basis of a calculation formula in 'outdoor drainage design specifications' used in China, the invention determines the relation between the rainfall and the runoff pollution reduction rate according to the rainfall change, the rainfall runoff pollution change and the rainfall runoff load change of a typical rainfall event, further determines the selection standard of an important parameter 'the regulated amount D', calculates the relation by utilizing an interpolation method, selects a table according to the corresponding relation between any regulated amount and the runoff pollution reduction rate under a certain rainfall, and finally obtains the relation table between the regulated tank volume and the SS pollutant reduction rate according to the calculation formula of the regulated tank volume in the standard. The method is not based on empirical value taking, and a more accurate, simple and applicable calculation method for controlling the volume of the runoff pollution storage tank is established by carrying out whole-process analysis on the runoff pollution load change process of a typical rainfall event.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (9)
1. A method for determining the volume of a storage tank based on runoff pollution control is characterized by comprising the following steps:
step 1: selecting typical rainfall events, and counting effective rainfall events to obtain a statistical value of the change process of rainfall in each rain along with time;
step 2: simultaneously, monitoring the rainfall runoff flow by adopting a Doppler ultrasonic pipeline flowmeter to obtain a monitoring value of the change process of the rainfall runoff flow along with time;
and step 3: sampling and analyzing pollutants of rainwater flowing through a rainwater pipeline in the full rainfall process of the rainfall event according to a certain time interval to obtain a change process monitoring value of the water quality of each pollution index of rainfall runoff along with the sampling time;
and 4, step 4: according to the results of the step 2-3, calculating by using a calculation formula (I) of the runoff pollution load to obtain the change relation of the rainfall runoff pollution load with time under different rainfall events;
and 5: obtaining the correlation between the rainfall amount changing along with the time in the rainfall event and the runoff pollution reduction rate of each pollution index by using a runoff pollution reduction rate formula (II) according to the change process statistic value of the rainfall amount changing along with the time in each rainfall event obtained in the step 1 and the change relation of the rainfall runoff pollution load changing along with the time in different rainfall events obtained in the step 4, and performing power function fitting analysis on the correlation to obtain a correlation equation and a correlation coefficient R2；
Step 6: calculating to obtain different runoff pollution reduction rate values according to the correlation relationship between the rainfall amount changing along with time in the rainfall event and the runoff pollution reduction rate of each pollution index, and performing power function fitting on the runoff pollution reduction rate values and the rainfall amount values under each rainfall event again to obtain a power function relation of the rainfall amount under the regulated storage amount D and the runoff pollution reduction rate;
and 7: repeating the steps 5-6 to obtain a power function relation of rainfall and runoff pollution reduction rate of a plurality of regulated storage amounts D;
and 8: aiming at the rainfall in any rainfall event, obtaining a runoff pollution reduction rate relation table corresponding to a plurality of regulated quantities D according to the power function relation of the rainfall and the runoff pollution reduction rate of the regulated quantities D obtained in the step 7, and calculating by using an interpolation method to obtain a corresponding relation selection table of any regulated quantity D and the runoff pollution reduction rate under the rainfall;
and step 9: and (3) obtaining a table for selecting the corresponding relation of the comprehensive runoff coefficient psi of the catchment area of the regulating and storing tank, the catchment area F, the regulating and storing amount D and the runoff pollution reduction rate according to a regulating and storing tank volume calculation formula (III) in the specification, and calculating to obtain a relation table of the regulating and storing tank volume and the runoff pollution reduction rate.
2. The method for determining the volume of the storage pond based on the runoff pollution control as claimed in claim 1, wherein in the step 1, five typical rainfall events, namely light rain, medium rain, heavy rain and heavy rain, are selected, and at least 5 effective rainfall events are counted.
3. A method as claimed in claim 1, wherein in step 2, the change of rainfall runoff flow rate with time is obtained by the following formula:
Q＝V*S
wherein Q is rainfall runoff flow, m3S; v is the flow speed of the rainwater pipeline, m/s; s is the area of the cross section of the rainwater flow of the rainwater pipeline, m2。
4. A method for determining the volume of a regulation pool based on runoff pollution control as claimed in claim 1, wherein in the step 4, the variation relationship of rainfall runoff pollution load with time under different rainfall events is obtained by the following formula:
in the formula, M is runoff pollution load generated by rainfall in the field, and g; ctProducing an instantaneous concentration at t, mg/L, for the rainfall in the field; qtProducing an instantaneous flow at t, m, for the rainfall of the field3S; delta t is the sampling interval time of the rainfall in the field, s; t is the duration of rainfall of the rainfall in the field, s; t is the total rainfall duration of the rainfall in the field, s.
5. The method for determining the volume of the regulation and storage pool based on the runoff pollution control as claimed in claim 4, wherein in the step 5, the runoff pollution reduction rate is a percentage of the runoff pollution load capacity capable of being stored in the regulation and storage pool to the total runoff pollution load capacity generated by the rainfall field, and the calculation formula is as follows:
in the formula, MtG, runoff pollution load generated when the rainfall of the field experiences t; mTG, runoff pollution load generated by the rainfall in the total rainfall duration of the field; p is runoff pollution reduction rate percent.
6. A method as claimed in claim 1, wherein in step 5, the correlation equation between the rainfall over time and the runoff pollution reduction rate of each pollution indicator in the rainfall event is as follows:
Y1＝aX1 b
in the formula, Y1Runoff pollution reduction rate,%, which is each pollution index; x1Is the amount of rainfall, mm, in the event of rainfall, which varies with time; a is a correlation equation coefficient; b is a correlation equation index.
7. A method for determining the volume of a storage pond based on runoff pollution control as claimed in claim 1, wherein in the step 6, the power function relation between the rainfall capacity and the runoff pollution reduction rate under the storage capacity D is as follows:
Y2＝aX2 b
in the formula, Y2Runoff pollution reduction rate,%, which is each pollution index; x2The rainfall is mm under the storage regulation quantity D; a is a correlation equation coefficient; b is a correlation equation index.
8. A method as claimed in claim 1, wherein in step 7, the rainfall capacity of the plurality of regulated quantities D is in a power function relationship with a runoff pollution reduction rate as follows:
Y3＝aX3 b
in the formula, Y3Runoff pollution reduction rate,%, which is each pollution index; x3Rainfall, mm, for a plurality of regulated storage volumes D; a is a correlation equation coefficient; b is a correlation equation index.
9. A method for determining the volume of a storage tank based on runoff pollution control as claimed in claim 1, wherein in the step 9), the regulation tank volume calculation formula (III) in the specification is as follows:
according to the calculation formula in the design Specification of outdoor drainage
V＝10DFΨβ (III)
In the formula: v is the effective tank volume of the storage tank, m3(ii) a D is the storage amount, and is measured according to rainfall; f is the catchment area, hm2β is safety factor and psi is comprehensive runoff coefficient.
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