CN111401598B - Quantitative evaluation method for urban single-site rainfall initial rainwater pollution based on SWMM model - Google Patents
Quantitative evaluation method for urban single-site rainfall initial rainwater pollution based on SWMM model Download PDFInfo
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Abstract
A quantitative evaluation method for urban single-site rainfall initial rainwater pollution based on SWMM model comprises the following steps: (1) calculating a smaller initial rainwater pollution value, taking the rainwater inlet at all catchment areas as a discussion object under the control of a pollutant net discharge constraint target, sequencing according to the time from large to small of the concentration of pollutants in the instantaneous flow of the rainwater according to the yield confluence time, and integrating the corresponding instantaneous flow until the net quantity of the pollutants contained in the rainwater meets the control target of the pollutant net discharge; (2) calculating a larger initial rainwater pollution value, and controlling the net discharge of pollutants at the water outlet to the minimum water quantity required to be controlled under the condition of meeting the requirement under the control of a pollutant net discharge constraint target. The quantitative calculation method for representing the initial rainwater pollution of the urban single-site rainfall by using the range value is realized based on the SWMM model, and the quantitative calculation method can scientifically and quantitatively evaluate the water quantity of the initial rainwater pollution of the urban single-site rainfall.
Description
Technical Field
The invention belongs to a city runoff pollution evaluation method, and particularly relates to a quantitative evaluation method for urban single-site rainfall initial rainwater pollution based on an SWMM model.
Background
Urban initial rainwater pollution evaluation is one of the key problems of water environment treatment. However, because of the influence factors such as peak staggering dilution, the method for accurately and quantitatively calculating the initial rainwater pollution of the urban single-site rainfall is not available except for an empirical parameter method.
Disclosure of Invention
The invention aims to provide a quantitative evaluation method for urban single-site rainfall initial rainwater pollution based on an SWMM model, which is a quantitative calculation method for representing the urban single-site rainfall initial rainwater pollution by using a range value and is realized based on the SWMM model, so that the quantitative evaluation of the urban single-site rainfall initial rainwater pollution water quantity can be scientifically and quantitatively performed.
The technical scheme of the invention is as follows: a quantitative evaluation method for urban single-site rainfall initial rainwater pollution based on an SWMM model is characterized by comprising the following steps: the method comprises the following steps:
(1) establishing an SWMM (single-wall-flow-tube-like membrane) model, simulating the current water quality and water quantity characteristics, calculating the total pollutant amount discharged into the receiving water body, and calculating the net pollutant amount control amount;
(2) calculating a small initial rainwater pollution value according to the net pollutant control amount calculated in the step (1), wherein the steps comprise:
A. sequencing the pollutant concentration from large to small according to the unit flow rate of all the catchment areas;
B. sequentially taking unit flow to accumulate and sum according to the sequencing of the step A, integrating corresponding instantaneous flow until the net amount of pollutants contained in the rainwater amount meets the control target of the net discharge amount of the pollutants;
(3) calculating a larger initial rainwater pollution value according to the pollutant net quantity control quantity calculated in the step (1), wherein the larger initial rainwater pollution value is the minimum water quantity required to be controlled under the condition that the net discharge quantity of pollutants at a water outlet is controlled to meet the requirement, and the method comprises the following steps of:
A. sequencing according to the unit flow of the water outlet in time;
B. sequentially taking unit flow accumulation and summation according to the ordering of the step A;
C. and if the net pollutant control meets the requirement, outputting a larger value of the runoff water quantity.
The step (2) is characterized in that according to the pollutant net quantity control quantity calculated in the step (1), the calculation method for calculating the smaller value of the runoff water quantity is as follows:
wherein:
Q inirain，min -the initial rainwater pollution water quantity is smaller, m 3 ；
Q I，i (t j ) Instant flow of catchment partition i at j, m 3 /s；
C I，i，TSS (t j ) Instantaneous concentration of contaminants, expressed as TSS, kg/m, at time j for water collection zone i 3 Or X10 3 mg/L；
imax i，j max j Water collection partition number and time number after sequencing according to TSS concentration from large to small in instantaneous flow rate and yield confluence time, i=1 to n imax ，j＝1～ njmax ；
n imax -total number of water-catchment zone differential units;
n jmax the flow rate of a single catchment area and the total number of water quality differential units, and the yield and the confluence time discussed by each catchment area are the same, so that the total is n jmax ；
TSS control -a net contaminant control indicator expressed in TSS, kg.
The calculation method for calculating the larger value of the runoff water quantity according to the net pollutant control quantity calculated in the step (1) is as follows:
wherein:
Q inirain，max -the initial rainwater pollution water quantity is larger, m 3 ；
Q O Instantaneous flow of (t) -drain at time t, m 3 /s；
C O，TSS Instantaneous contaminant concentration at time t, expressed as TSS, kg/m for (t) -drain 3 Or X10 3 mg/L；
TSS control -net amount control of contaminantsA preparation index expressed in TSS, kg;
t 0，O -total time of confluence at the drain port s.
The invention has the following advantages and positive effects:
1. the invention scientifically deduces the quantitative evaluation method of the initial rainwater pollution based on the range value based on the water quality control volume concept, and compared with the traditional method, the quantitative evaluation method can realize scientific quantification and provide more scientific theoretical evaluation basis for related work;
2. according to the invention, SWMM model is utilized for secondary development, and on the premise of accurate model parameters, the accuracy of water quality and water quantity data is guaranteed, and rapid calculation can be realized.
Drawings
Fig. 1 is a process flow diagram of the present invention.
Detailed Description
The quantitative evaluation method for the initial rain water pollution of the urban single-site rainfall based on the SWMM model refers to the basic idea of water quality control volume (WQV), and the quantitative evaluation method for the initial rain water pollution of the urban single-site rainfall is to comprehensively consider the source to the tail end to determine the single-site rainfall control water quantity so as to meet the constraint target that the net amount of pollutants discharged by a water outlet is within the allowable discharge capacity. Because of such effects as peak shifting dilution, the amount of initial rainwater pollution from the source catchment area is theoretically small, and the amount of initial rainwater pollution from the end drain outlet is theoretically large. Accordingly, the initial rainwater pollution is expressed as a range value, and the quantitative calculation can be performed under the condition of avoiding the complex actions such as peak-shifting dilution evaluation and the like.
As shown in the figure: the invention comprises the following steps:
1. establishing an SWMM (single-wall-flow-tube-like membrane) model, simulating the current water quality and water quantity characteristics, calculating the total pollutant amount discharged into the receiving water body, and calculating the net pollutant amount control amount;
2. under the control of the pollutant net discharge constraint target, calculating a smaller value of the runoff quantity of the polluted water, taking the rain water inlet at all catchment areas as a discussion object, sequencing according to the yield converging time from large to small of the pollutant concentration in the instantaneous flow, and integrating the corresponding instantaneous flow until the net quantity of the pollutant contained in the rainwater meets the control target of the pollutant net discharge.
The specific calculation method is as follows:
wherein:
Q inirain，min -the initial rainwater pollution water quantity is smaller, m 3 ；
Q I，i (t j ) Instant flow of catchment partition i at j, m 3 /s；
C I，i，TSS (t j ) Instantaneous concentration of contaminants, expressed as TSS, kg/m, at time j for water collection zone i 3 Or X10 3 mg/L；
imax i ，jmax j Water collection partition number and time number after sequencing according to TSS concentration from large to small in instantaneous flow rate and yield confluence time, i=1 to n imax ，j＝1～n jmax ；
n imax -total number of water-catchment zone differential units;
n jmax the flow rate of a single catchment area and the total number of water quality differential units, and the yield and the confluence time discussed by each catchment area are the same, so that the total is n jmax ；
TSS control -a net contaminant control indicator expressed in TSS, kg.
3. Under the control of the pollutant net discharge constraint target, calculating a larger value of the runoff water quantity of the polluted water, wherein the larger value is the minimum water quantity required to be controlled under the condition that the pollutant net discharge of the water outlet is controlled to meet the requirement. The amount of water at this time is theoretically a small value, namely:
wherein:
Q inirain，max -initial rainwater contaminated waterLarger value of m 3 ；
Q O Instantaneous flow of (t) -drain at time t, m 3 /s；
C O，TSS Instantaneous contaminant concentration at time t, expressed as TSS, kg/m for (t) -drain 3 Or X10 3 mg/L；
TSS control -a net contaminant control indicator, expressed as TSS, kg;
t 0，O -total time of confluence at the drain port s.
4. Based on SWMM model secondary development, the output water quantity and water quality data are utilized for calculation.
Claims (3)
1. A quantitative evaluation method for urban single-site rainfall initial rainwater pollution based on an SWMM model is characterized by comprising the following steps: the method comprises the following steps:
(1) establishing an SWMM (single-wall-flow-tube-like membrane) model, simulating the current water quality and water quantity characteristics, calculating the total pollutant amount discharged into the receiving water body, and calculating the net pollutant amount control amount;
(2) calculating a minimum initial rainwater pollution value according to the net pollutant control amount calculated in the step (1), wherein the steps comprise:
A. sequencing the pollutant concentration from large to small according to the unit flow rate of all the catchment areas;
B. sequentially taking unit flow to accumulate and sum according to the sequencing of the step A, integrating corresponding instantaneous flow until the net amount of pollutants contained in the rainwater amount meets the control target of the net discharge amount of the pollutants;
(3) calculating the maximum initial rainwater pollution value according to the pollutant net quantity control quantity calculated in the step (1), wherein the maximum initial rainwater pollution value is the minimum water quantity required to be controlled under the condition that the net discharge quantity of pollutants at a water outlet is controlled to meet the requirement, and the method comprises the following steps of:
A. sequencing according to the unit flow of the water outlet in time;
B. sequentially taking unit flow accumulation and summation according to the ordering of the step A;
C. and outputting the initial rainwater pollution maximum value if the net pollutant control meets the requirement.
2. The quantitative evaluation method for urban single-site rainfall initial rainwater pollution based on SWMM model as claimed in claim 1, wherein the quantitative evaluation method is characterized in that: the step (2) is characterized in that according to the pollutant net quantity control quantity calculated in the step (1), the calculation method for calculating the initial rainwater pollution minimum value is as follows:
wherein:
Q inirain，min -minimum initial rainwater pollution amount, m 3 ；
Q I，i (t j ) Instant flow of catchment partition i at j moment, m 3 /s；
C I，i，TSS (t j ) Instantaneous concentration of contaminants, expressed as TSS, kg/m, at time j for catchment zone i 3 Or X10 3 mg/L；
imax i ，jmax j Water collection partition number and time number after sequencing according to the TSS concentration from large to small in the instantaneous flow rate and the yield confluence time, i=1 to n imax ，j＝1～n jmax ；
n imax -total number of catchment zone differential units;
n jmax the flow rate of a single catchment area and the total number of water quality differential units are the same, and the yield and the confluence time of each catchment area are the same, so that the total is n jmax ；
TSS control -a net contaminant control indicator, expressed as TSS, kg.
3. The quantitative evaluation method for urban single-site rainfall initial rainwater pollution based on SWMM model as claimed in claim 1, wherein the quantitative evaluation method is characterized in that: the method for calculating the maximum value of the initial rainwater pollution according to the net pollutant control amount calculated in the step (1) comprises the following steps:
wherein:
Q inirain，max -maximum initial rainwater contaminated water quantity, m 3 ；
Q O (t) -instantaneous flow of drain at time t, m 3 /s；
C O，TSS (t) -instantaneous contaminant concentration at time t in the drain port expressed as TSS, kg/m 3 Or X10 3 mg/L；
TSS control -a net contaminant control indicator, expressed as TSS, kg;
t 0，O -total time of confluence at the water outlet, s.
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| CN106650044A (en) * | 2016-12-05 | 2017-05-10 | 北京工业大学 | Method for determining W parameter of surface runoff pollutant in SWMM software |
| CN106706873A (en) * | 2016-12-05 | 2017-05-24 | 北京工业大学 | Method for directly obtaining parameter W in SWMM (storm water management model) water quality model |
| CN106706459A (en) * | 2016-12-05 | 2017-05-24 | 北京工业大学 | Method for determining natural rainfall water quality parameter W1 affected by air pollution |
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| CN106650044A (en) * | 2016-12-05 | 2017-05-10 | 北京工业大学 | Method for determining W parameter of surface runoff pollutant in SWMM software |
| CN106706873A (en) * | 2016-12-05 | 2017-05-24 | 北京工业大学 | Method for directly obtaining parameter W in SWMM (storm water management model) water quality model |
| CN106706459A (en) * | 2016-12-05 | 2017-05-24 | 北京工业大学 | Method for determining natural rainfall water quality parameter W1 affected by air pollution |
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