Based On SWAT Model Of Harbin Millstone Hill Reservoir Watershed Non-point Source Pollution Simulation Study

Harbin mopanshan reservoir is the only water source of drinking water in Harbin city of 4.736 million people,with the rapid development of social economy,people’s environmental protection and health awareness,more and more attention to the environment safety problems in the water source.The main source of pollution in Harbin Mopanshan Reservoir watershed for non point source pollution, non point source pollution to take effective preventive measures, to reduce the pollution load of non point source is the guarantee of safe drinking water in Harbin city and Harbin City, to ensure social stability and sustainable economic development play a major role.In this paper, using GIS method, physical model of SWAT to construct distributed in Harbin Mopanshan Reservoir Watershed point source pollution situation is simulated, using the GISR to find the factors of non point source pollution load, take the best management mode, the effective protection of water sources and water quality of ecological environment. The full text is divided into 8 chapters,4 parts, the first part is the first chapter, on the non point source pollution and protection of water resources at home and abroad the latest progress are reviewed; The second part includes the second chapter and the third chapter and the fourth chapter, mainly on the study area and the SWAT model are introduced, and the data processing model based calibration and verification;The third part includes the fifth chapter, the sixth chapter, the seventhchapter, the eighth chapter, the main research area is simulation of non point source pollution, explores the effective protection of water sources; The fourth part is the conclusion.Through research, the main draw the following conclusion:(1) Construction of SWAT physical model of distributed success in Harbin MopanshanReservoirwatershed, sensitivity analysis, calibration and verification, the relative error of RE is less than 20%, the model efficiency coefficient Ens of not less than 0.7, the correlation coefficient R2 of not less than 0.68, show that the model parameters of the set-up is credible, model predictionaccuracy is a certain security the prediction model can meet the requirements of.(2) Through the simulation of Harbin Mopanshan Reservoir Watershed non point source pollution,reveals the characteristics of the study area of non point source pollution, non point source find artificial main contribution rate is the agricultural non-point source. Through the spatial and temporal distribution of non point source pollution, non point source pollutants losses occur inmost is generated during the flood season rainfall and surface runoff, sediment erosionaccounted for more than 86% flood loss, TN pollution load accounts for the total pollution load in flood season 51.29%, TP pollution load accounts for the total pollution load of 58.07%. Rural residential areas in close distance water and farmland nonpoint source pollution load is higher, larger influence on water quality.(3) Analysis of land use change situation of Mopanshan Reservoir watershed, forest land is the main land that Mopanshan Reservoir watershed land use type, followed by unused land accounted for a large proportion of larger, from 2009 to 2013, the land use change is not big, the biggest change is the grassland, increased by accounting for area of 1.8%to 3.12%, an increase of 1.32%, increase grassland area of 1503.63 Hm2, followed by the dry land area changes greatly,reduce the occupied area of 6.05% to 5.08% by 1109.79, hm2 reduced the dry farmland area,other types of land use change are not big area.(4) Of non-point source pollution through different land use the impact analysis, concluded that forest has strong effect of water, and sediment reduction, from the view point of nonpoint source pollution control, and should not be greater than 15 o existing unutilized land farming hilly land should be uniform afforestation and grass planting, water close distance to your village, village should move as soon as possible, three class of cultivated land should be returning farmland to forest and grass.(5) In combination with the practical situation of the study area, analyzed the livestock and poultry breeding non-point source pollution of environmental risk. Study area for aquaculture wastewater for a total of 49930 t contains TNI.073 t, TP3.92 t, waste load estimation results show that the three class village, yongsheng, forest farm bear the strongest ability of livestock and poultry dung, bear ability whereby the long march is the most weak and dawn forest farm. On the basin CunTun respectively to calculate warning values of A village of only three class and the big expensive warning level to class Ⅲ elsewhere are Ⅱ level.(6) Landscape of non-point source pollution in a source to a millstone, best management measures is ecological immigration and take ecological compensation mechanism. Existing of basin non-point source pollution load are calculated, the results show that the research of regional soil erosion pollution value the most about 45% loss, rural life second pollution loss by 37%, and the value of livestock and poultry breeding pollution loss minimum of about 18%.In this paper, the main innovation point:Study on Harbin Mopanshan Reservoir watershed land use spatial and temporal characteristicsand its influence on reservoir quality and quantity, for the watershed protection and developmentpolicy formulation, and provide scientific basis for the utilization of land management.The successful construction of SWAT model for the first time in Harbin Mopanshan Reservoir Basin, a new platform for the study of non point source pollution of the basin.