A Method of Determining Parameters of SWMM Water Quality Scouring Model

Abstract

The invention relates to a method for determining an SWMM water quality scouring model parameter and belongs to the crossing fields of municipal engineering and environmental engineering crossing and the like. First surface runoff water samples are obtained through a surface runoff sampling device, surface runoff water samples at different moments are obtained at the same interval time, pollutant concentration Wt is detected, and the rainfall intensity value qt at the moment t is recorded; a pollutant deposition load value is obtained by combination with detection of earth surface deposition collected in dry days, a unit area pollutant deposition amount initial value undergoes scouring subduction at the moment t to obtain a remaining pollutant cumulant Bt, and Bt, Wt and qt values at different moments in a rain are substituted into an index scouring function formula; each scattered point is drawn through the excel, a tendency chart and a tendency function are added, and values of S1 and S2 are obtained from the tendency function formula. By comparison of engineering practice monitoring results and model simulation results, water quality parameter obtaining correctness is found, and it is indicated that the method has scientificity and practical values.

Description

technical field [0001] The invention relates to a method for determining parameters of a SWMM water quality scouring model, which belongs to the intersecting fields of municipal engineering, environmental engineering, sponge city construction and computer model software parameter determination. Background technique [0002] SWMM (Storm Water Management Model), also known as storm flood management model, is a dynamic precipitation-runoff simulation model developed by the US Environmental Protection Agency. In addition to simulating a single precipitation event or long-term water volume in a city, it can also be used for water quality simulation. . Its runoff module part comprehensively handles the precipitation, runoff and pollution loads that occur in each sub-basin. The confluence module part transmits water through pipe networks, channels, water storage and treatment facilities, water pumps, and regulating gates. The model can track and simulate the water quality and qua...

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Problems solved by technology

[0004] SWMM model parameters are determined by the U.S. Environmental Protection Agency based on factors such as land use types, surface pollution conditions, and environmental quality in the United States, and its use has limitations

Due to the differences in terrain and urban living environment, the limitations of its parameters make it impossible to directly simulate and use in the water quality of urban surface runoff in my country

At present, in the use of domestic SWMM water quality models, most of the parameters in foreign SWMM model manuals are copied. There is no set of parameters suitable for my country's national conditions, and there is no set of calibration methods for SWMM water quality parameters.

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