Simulation Analysis Of Water Submerging Dynamic Evolution On Coal Mining Subsidence Area Of Longkou City

Large-scale of coal mining subsidence area often forms seasonal waterlogging or perennial waterlogging. This becomes the main factor about restricting the sustainable development of mining area. Recently, with the improvement of environmental protection thoughts, treatment and utilization of coal mining subsidence area become the emphases of research. So, it is necessary to analyze the dynamic evolution about the region of accumulated water of coal mining subsidence area. Taking coal mining subsidence area of Longkou for research, this paper, analyzes the water submerging dynamic evolution, supported by national natural science fund"The function of land, sea and environment impact and ecological effect of human activity", the subject of"The renewal database of land use of Longkou city"and"Technology study of China-Germany on water resources comprehensive management in coastal area", and builds mathematical models about the flood dynamic evolution. The major contents and research results are as following:(1) Taking aerial photo of 1984, TM of 1996, ETM+ of 2000 and QuickBird of 2004 for data sources, the water area of coal mining subsidence area was extracted by GIS based on image correction and image enhancement processing. These GIS methods include vectorization operation of aerial photo and decision tree method about extracting information of TM and QuickBird.(2) Based on high precision elevation data, the method of TIN interpolation was utilized in interpolation of contour lines, DEM of the research area based on TIN interpolation was built. Then the author corrected the generated DEM data by filling depression, smoothing treatmention and elevation incremental superposition, discriminanted and removed the existing depressions and flat regions. The precision of DEM is further improved. Based on correctional DEM, the analysis of surface catchment flow direction is used to segment the coal mining subsidence area and the sand mining subsidence area. The watershed is the boundary. The range of the coal mining subsidence area can be confirmed by difference operation, and the area can be calculated by this method.(3) Taking flood period for typical study period, the paper combines DEM of the flood region and acquires a smooth elevation distribution in the flood borderlines. After assuming floodwater in the flood area to be an inclining plane, the depth distribution within the boundaries can be computed using a bilinear interpolation algorithm.(4) The paper analyzes the submerged range by plane simulation method. This analysis considered the effects of groundwater level and surface runoff, and calculates the submerged area of coal mining subsidence area under differently hydrological conditions by non-source flooding analysis. So it has guiding effect for flood protection of coal mining subsidence area.(5) The paper introduces water level depth based on the simulation analysis of water submerging, builds the water area-water depth model and water accumulating volume-water depth model. And the experiments prove that the models can achieve satisfactory effect. The results show that it can easily calculate the water ranger of coal mining subsidence area based on water level value or water depth by the models. It is feasible to real-time monitor the submerged dynamic changes of coal mining subsidence area. Last, three-dimensional visualization study is showed the process of water submerged.