Study On Prediction Of Antimony Pollution Load In Runoff Of Rain Water In Antimony Mining Area By Improved Distributed Hydrological Model

Watershed hydrological model is a tool to study the law of hydrological change and rational allocation of water resources,which plays an important role in the study of hydrological situation and agricultural production.In recent years,hydrological model has developed to the stage of distributed hydrological model,which can analyze the spatial variation of model parameters and structure and the spatial variation of underlying surface and soil water content of watershed,and is the main tool of watershed water cycle research.SWAT model is the representative of distributed hydrological model,which is widely used,from watershed runoff simulation,basin underlying surface condition change and climate change response simulationFor a long time,due to the unreasonable development of heavy metals,heavy metal pollution is becoming more and more serious,which leads to heavy metal pollution in other areas in the process of water cycle.Antimony is a kind of heavy metal which is very harmful.A series of ore collection and processing processes,such as mining,smelting and so on,as well as the release and migration of a large number of heavy metal antimony caused by the weathering and leaching of waste slag,enter Rain Water runoff through different ways under the action of rainfall runoff,resulting in serious antimony pollution in the water environment of the local area.The following environmental and human health risks have attracted extensive attention of researchers at home and abroad.Antimony and its compounds are slow Sexual toxicity and potential carcinogenicity of dangerous substances,once into the epiphytic environment,will inevitably produce toxic effects on animals and plants,and through the food chain,breathing,direct contact and other channels into the human body,causing harm to human health.Antimony and its compounds have been listed as priority pollutants by the US EPA and the European Union,and are also closely watched by the Japan Environment Agency.Inclusion of antimony among hazardous wastes in the Basel Convention limits on transboundary movement of hazardous wastes.As the largest country in the world,China should pay more attention to the investigation and research of antimony pollution.Bioavailability..The simulation of non-point source pollution has been studied.In this paper,by using the SWAT model in the hydrological distribution mode and the model of the heavy metal migration conversion model compiled by the Fortran language,the pollution load in the rainwater runoff in the antimony mining area is predicted by using the SWAT model in the hydrological distribution mode and the program and the model of the heavy metal migration conversion model compiled by the Fortran language in the research area of the antimony mining area.The main research results are as follows;1.Analyze and process basic data required for model operation,including land use data,meteorological data,soil data,land use database,meteorological database and soil database.On the basis of DEM,Arc Gis9.3 is used to divide subwatershed,river network generation,watershed boundary and hydrological response unit.The whole research area is divided into 17 sub-basins and 50 hydrological response units.2.in that method,a heavy metal migration conversion model program and a model are compile by a Fortran language so as to construct a SWAT model for simulating the pollution load of heavy metal pollution flow in the rainwater runoff of the study area,and finally,the model is adjusted and optimized to simulate the pollution load of heavy metal antimony in the rainwater runoff of the antimony mining area,This paper provides a theoretical basis for the assessment and prevention of antimony pollution in the research area.3.The runoff is simulated by using the existing data,and the model is calibrated and verified by using the measured runoff data to determine the applicability of the model in the study area.And the sensitivity analysis and the parameter rate of the model are determined.The acquisition of the pollution-critical areas in the antimony mining area is in accordance with the actual mining area.The results of the simulation of the annual pollution load of the antimony in each sub-basin of the study area were obtained by using the SWAT model,and the regression coefficient value is 0.88,the efficiency coefficient is 0.75,and the pollution load of the heavy metal antimony is mainly distributed in the middle direction.Smelter,tailings landfill and a mining mine in the study area are the highest areas of pollution load for antimony in the year(240-399.99kg).the main transportation route in antimony mining area,and the annual pollution load(70-239.99 kg)in the mining mountain and slag stacking area ishigher.the annual antimony pollution load(0-70 kg)in residential areas and farmland areas around the mining area is low.Finally,according to SWAT model and heavy metal migration and conversion compilation model,the simulation effect of antimony annual pollution load of heavy metal is good.This provides a theoretical and scientific basis for the evaluation and control of heavy metal pollution in antimony mining area and other non-ferrous metal mining areas,and has far-reaching social and scientific significance.