Hydrologic Simulation Method Of Land Use/Cover Change In Mining Area Based On Digital Elevation Model

The land use / Cover Change(LUCC)caused by the plundering mining of coal resources will make dramatic changes in the intercepting flow,soil water condition,surface evaporation and the supply and demand relation of water resources in mining area,which will cause great damage to the ecological environment and economic development of the mining area.Digital elevation model(DEM),as a typical data model of GIS,has a very strong ability to display spatial data.The accessibility and editable of DEM's digital surface information can explore the law of Hydrology in the mining area under the time and space change,and provide important support for the problem of water resources caused by the irrational development of human beings.Most distributed hydrological models also use DEM as one of the basic data.However,at present,the water resources problem caused by LUCC in the mining area has not been studied deeply,and the scholars' understanding of the hydrological change situation in the mining area is still insufficient,and the corresponding forecasting means are lacking.The existing reference basin contrast method,historical inversion method,land use /cover scenario prediction model,extreme land use / cover method,land use / cover space allocation method can provide a certain hydrological simulation reference for the study area,but they have great changes in terrain and complex and fluctuant mining environment.The support is weak and can not provide detailed land use / cover optimization allocation plan for the mining area.In view of these problems,based on the DEM data of Xishan Mining Area in Taiyuan,based on the existing extreme land use / cover method and the environmental characteristics of the mining area,this paper tries to provide support for the recovery of hydrology and ecological environment in the Xishan mining area of Taiyuan by using the optimization method of the limit slope LUCC hydrological simulation.The experiment is based on DEM data.On the premise of using the "blue line" fractal theory to improve the accuracy of the maximum slope LUCC hydrological simulation optimization method,three kinds of extreme land use / cover change,2006-2014 year time sequential land use / cover change,and limit slope LUCC hydrological simulation optimization method are applied to the Taiyuan Xishan Mining Area The hydrological effects of land use / cover change scenarios and optimal land use / cover change scenarios are simulated.The results show that the water conservation of the land use / cover optimization scheme based on the LUCC hydrological simulation optimization method based on the digital elevation model is higher than that of the 2006-2014 year time series land use / cover situation of the mining area and the water conservation of the extreme land use / cover situation in the mining area which is all cultivated in the mining area and the mining area is all grassland.The land use / cover in the mining area with the best water holding capacity and poor adaptability is the single extreme land use / cover situation of woodland.Therefore,the LUCC hydrologic simulation optimization method based on the digital elevation model is more suitable than the existing extreme land use / cover method for the mining environment with large terrain change and complex fluctuating terrain,which has a prominent effect on the recovery of the hydrology and ecological environment of the mining area.