Method for determining scouring efficiency of water-impermeable surface runoff pollutants on basis of isochrone method

Abstract

The invention discloses a method for determining scouring efficiency of water-impermeable surface runoff pollutants on basis of an isochrone method and belongs to the cross field of municipal engineering and environment monitoring. A study area is generalized on the basis of monitoring of the surface runoff pollutants, and runoff speed determination, isochrone division and isochrones area determination are performed with the unit time as the dividing point; next, a water outlet flow hydrograph is drown according to isochrones, the pollutant load capacity Mt in the time period is obtained after the difference between the surface runoff pollutant concentration Ct monitored in each time period and the natural rainfall concentration C0 is multiplied by the corresponding flow Qt; then, the total load capacity sigma M is obtained by accumulating runoff pollutant loads in all time periods, and the delta value is obtained by comparing the sigma M with the pollutant load capacity M of surface swept matter before rainfall; finally, the value range of delta is obtained according to multiple rainfalls, and the magnitude range of the surface runoff pollutant load sigma M formed by certain rainfall in the future is estimated through reverse calculation of delta. The method is simple and easy to understand and is applied and verified.

Description

technical field [0001] The invention relates to a method for measuring the scouring efficiency of impermeable surface runoff pollutants based on the isochrone method, and belongs to the intersecting field of municipal engineering technology and environmental engineering monitoring technology. Background technique [0002] With the continuous acceleration of urbanization, the increase of urban impermeable surface area, the formation of urban heat island effect, and the global warming make the frequency of short-duration heavy rainfall increase, which may easily lead to the occurrence of urban waterlogging, such as Beijing in 2012 The 7.21 incident and the large-scale waterlogging in the south in 2015, accompanied by the occurrence of urban waterlogging, resulted in the formation of surface runoff pollutants, especially when the impermeable surface pollutants were washed and flowed to every corner of the city, causing serious damage to urban environmental sanitation. Harmful, ...

AI Technical Summary

Problems solved by technology

At present, the research on surface runoff pollutants in my country has changed from traditional qualitative research to generalized model research, mainly through computer model software to simulate the migration process of surface pollutants, so as to calculate the amount of pollutants washed away in a rainfall, However, most of the current computer models such as the SWMM water quality model are designed according to the environmental characteristics and climate characteristics of foreign countries, resulting in differences in parameters from those in my country, which cannot truly reflect the erosion process of pollution. At the same time, the erosion capacity of different rainfall intensities on the surface The concentrations of the obtained pollutants are also different, resulting in different scouring efficiencies, which also have an impact on the calculation of surface scouring capacity

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