The Research Of Combined With SWAT And SWMM Model And The Water Point Source Pollution Prediction Of The Plain River Network City

Excessive exploitation of resources poses a direct threat to the survival of humans and other living things.Human activities produce harmful substances continuously flows into the environment.Catastrophic environmental accidents and high pollution become current characteristics.By the production level,demand,such as unbalanced development factors,environment problem is increasingly serious,especially the water pollution of the environment problem increasingly prominent.The study which aims at the simulation of point source pollution diffusion in plain river network,starting from the principle of hydrology and environmental hydraulics,based on the analysis of the migration and diffusion characteristics of point source pollution in plain river network,this paper discusses the migration and diffusion simulation method of water pollutants in plain river network area.Based on the analysis of the characteristics and applications of SWAT model and SWMM model,this paper constructs a dynamic coupling model of quality and quantity of water for the combination of SWAT model and SWMM model for plain river network.This model uses the SWAT model to extract the basins of the regional,simulate regional surface production and confluence processes,calculate river flows,and provide initial input parameters for pollutant diffusion in urban areas of plain river networks.On the basis of the SWMM model,the plain river network simulates the hydrodynamic conditions of the urban river network to simulate the distribution and variation of the water point source pollution in a large amount of rainfall.Based on the above model,this paper selects Yuyao,a plain river network city,as a research area.Data on DEM,high-resolution remote sensing images,land use,soil,and digital water systems that can completely cover the study area,as well as hydrological monitoring data,meteorological data,and key pollution sources were collected,and a watershed-city water quality and water quality dynamic coupling model was constructed.Through the analysis and evaluation of the model simulation results,we found that it is basically consistent with the hydrological and hydrodynamic conditions ofthe urban river network.The preliminary validation is SWAT model and SWMM coupling model can be used to predict the dispersion of point source pollution in river networks,providing scientific basis for the establishment of environmental risk management and emergency plan for sudden environmental pollution.