The Simulation Research On Non-point Source Pollution In HuangShui River Based On SWAT Model

In recent years, as the point source pollution has been controlled, non-point source pollution has become the main cause of water pollution. North Water Transfer Project is a serious water shortage in northern China's key projects, the water source or water environmental protection will directly affect water quality and determine the effectiveness of the project, as the North Water Transfer Project Danjiangkou reservoir water to the water environment protection and water pollution in the North Water Transfer Project has an important role. Carried out on Danjiangkou reservoir simulation of non-point source pollution, soil erosion Danjiangkou understanding of the situation, as the Danjiangkou reservoir construction and management have important practical significance.Support programs at the national key project "lake district agricultural nonpoint source pollution prevention and integrated control technology"-Topic:South Water Reservoir along the Danjiangkou Ecological Rehabilitation Research and Demonstration (ID:2007BAD87B09) (2008.01-2010.12) under the auspices of remote sensing and GIS technology in support of the use of ArcSWAT model through the model parameter extraction, on the Yellow River water source Danjiangkou Reservoir watershed non-point source pollution were simulated, the main conclusions are as follows:DEM simulation of the establishment of 1:5 million through digital topographic maps, the establishment of Yellow River Basin and the ground resolution of 10 meters of the TIN DEM.Land use data from the June 18,2007 QuickBird Satellite Image in the United States in the visual interpretation by ArcGIS.Land use study area is divided into 10 categories, which is not hard to use and use of land, shrub land, dry land, settlements, forest land, transportation land, water, forest, grassland and paddy field.SWAT soil data used in the model are more divided into soil physical properties and chemical properties of two kinds.Through field sampling in this study, the actual measured soil chemical properties and mechanical composition,soil bulk density, available water capacity and saturated conductivity calculated using the SPAW software to, hydrological unit group, surface reflectivity, soil erosion factor from the known data by formula that anion exchange porosity and compressibility of the soil maximum amount of conductivity the absence of measured data, using the SWAT model default values.SWAT model requires meteorological data include watershed, precipitation, maximum temperature, minimum temperature, solar radiation, wind speed and relative humidity, meteorological data, the calculation of dew point by SWAT model input data pre-processing module and rainfall data pre-processing module statistical computing.In this study, based on 2010 forecasts, and from 2010 to 2030 Yellow River basin runoff, sediment and pollution loads were simulated and predicted. Main results include:rainfall, runoff for many years on average; the annual output of N, P pollution load; monthly output of the model N, P pollution load. The results indicate that nitrate runoff, lateral seepage nitrate, leached nitrate, changes in crop N uptake by the water production related to rainfall runoff received a greater impact; organic nitrogen, dissolved phosphorus and organic phosphorus Change the time of fertilization is received.