A Calculation Method of Pollutant Concentration in Roof Rainwater Runoff and Its Controlled Release Application

A technology of pollutant concentration and calculation method, applied in the direction of calculation, data processing application, general water supply saving, etc., can solve problems such as large differences, achieve good operability, improve construction efficiency, and improve the effect of sponge city construction in residential communities

Active Publication Date: 2022-05-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, on the one hand, due to the many factors affecting the erosion process, including rainfall intensity, catchment length, slope, pollutant type, etc., and on the other hand, due to the uncertainty of rainfall in the actual process, the current water quality model is used to analyze the roof runoff. There are certain limitations in the calculation method of pollutant concentration, which is quite different from the actual situation.

Method used

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  • A Calculation Method of Pollutant Concentration in Roof Rainwater Runoff and Its Controlled Release Application
  • A Calculation Method of Pollutant Concentration in Roof Rainwater Runoff and Its Controlled Release Application
  • A Calculation Method of Pollutant Concentration in Roof Rainwater Runoff and Its Controlled Release Application

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Embodiment 1

[0036] A method for calculating the pollutant concentration of roof rainwater runoff, the steps are as follows:

[0037] (1) Based on the rain pattern formula issued by City S in 2017 (Formula 1, which conforms to the characteristics of typical Chicago rain patterns), the change law of rainfall in City S in different rainfall recurrence periods is known, and the specific parameter c in the rain pattern formula is extracted = 0.846, b = 7, r = 0.4, and apply this data in subsequent steps;

[0038] When 0

[0039] When 60×r

[0040] Among them, t is the rainfall duration, min; r is the comprehensive rain peak position coefficient; t b is the duration of rainfall before the peak, min; t a is the duration of rainfall after the peak, min; i(t b ) is the instantaneous intensity before the peak, mm / min; i(t a ) is the instantaneous intensity after the peak, mm / min; P is the designed rainstorm return period, a;

[0041] (2) Design the rainfall return period P=1a and the rainfall...

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Abstract

The invention belongs to the technical field of resources and environment. The existing water quality model to calculate the concentration of roof runoff pollutants is quite different from the actual application. Aiming at the problems in the prior art, the present invention discloses a method for calculating the pollutant concentration of roof rainwater runoff. The steps are as follows: firstly, the typical rain pattern formula of regional rainfall is determined, and the rainfall drop in different rainfall return periods of the area is obtained through the rain pattern formula. Then, design the rainfall return period P and the rainfall duration T in this area, collect the number of sunny days Td before the rainfall in this area, and select a certain roof as the object , specify its length L and slope θ; then calculate the confluence time tc from formula 2, and select the corresponding pollutant concentration calculation formula according to the confluence time tc to describe the change process of roof runoff pollutant concentration with time. The calculation formula is scientific and highly correlated with the experimental data.

Description

technical field [0001] The invention specifically relates to a method for calculating the concentration of roof rainwater runoff pollutants and its controlled release application, belonging to the technical field of resources and environment. Background technique [0002] With the increase of urban residential areas and building density, the roof area continues to expand, and a large amount of pollutants will accumulate on the surface on sunny days. When it rains, these pollutants will enter the urban water environment with rainwater runoff. Many studies have shown that the pollutant concentration of roof runoff is similar to that of road runoff, and some pollutants even exceed that of road runoff. Roof runoff, especially initial roof runoff, has become one of the causes of urban rainwater non-point source pollution. In this context, the simulation of roof runoff water quality is of great significance in the controlled release of pollutants and technical optimization. The r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/06G06Q50/26
CPCG06Q10/0637G06Q50/26Y02A20/152
Inventor 徐竟成顾韫辉任婕林晓虎郑涛程炜孙丹焱黄菊文乔俊莲李光明
Owner TONGJI UNIV
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