Quantitative evaluation method for initial rainwater pollution of urban single rainfall based on SWMM model

Abstract

The invention discloses a quantitative evaluation method for initial rainwater pollution of urban single rainfall based on an SWMM model. The method comprises the following steps: 1, calculating an initial rainwater pollution minimum value; under the control of a pollutant net discharge capacity constraint target, taking gutter inlets at all catchment subareas as discussion objects, sorting the discussion objects according to the production and confluence time of the pollutant concentration in the instantaneous flow ratein a descending order, and then integrating the corresponding instantaneous flow rate until the pollutant net amount contained in the rainwater amount meets the control target of the pollutant net discharge capacity; and (2) calculating an initial rainwater pollution largevalue: under the control of a pollutant net discharge capacity constraint target, controlling the pollutant net discharge capacity of a water outlet to reach the minimum water quantity required to becontrolled under the condition that the requirement is met. The method is a quantitative calculation method for representing the initial rainwater pollution of the urban single rainfall by using therange value, is realized based on the SWMM model, and can scientifically and quantitatively evaluate the initial rainwater pollution water quantity of the urban single rainfall.

Description

technical field [0001] The invention belongs to urban runoff pollution evaluation methods, in particular to a quantitative evaluation method for urban single-field rainfall initial rainwater pollution based on SWMM model. Background technique [0002] Evaluation of urban initial rainwater pollution is one of the key issues in water environment governance. However, due to factors such as staggered peak dilution and other influencing factors, there are few methods that can accurately and quantitatively calculate the initial rainwater pollution of a single urban rainfall in addition to the empirical parameter method. Contents of the invention [0003] The purpose of the present invention is just to provide a kind of quantitative evaluation method of rainwater pollution at the initial stage of urban single-field rainfall based on SWMM model, this method is a kind of quantitative calculation method that expresses urban single-field rainfall initial stage rainwater pollution wit...

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Problems solved by technology

However, due to the influence factors such as staggered peak dilution, there are few methods that can accurately and quantitatively calculate the initial rainwater pollution of a single urban rainfall in addition to the empirical parameter method.

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