Modelling the changes in hydrologic and hydrogeologic systems due to land subsidence induced by underground longwall mining
Land subsidence caused by underground longwall mining impacts the surface water and groundwater systems respectively. As subsidence continues with the progression of mining, changes the morphology of the overlying watercourse and interrupts the groundwater system beneath. Modelling such dynamic processes of high spatial and temporal variability is of great importance for water resources and risk management. The study site, located in the Ruhr District of Germany, experienced longwall mining to extract the Carboniferous coal deposits from a depth of about 1000 m. This resulted in an increasing subsidence with time. The geometry of the watercourse overlying mined out panels deformed and the thickness of the layer to the groundwater table reduced. Thus a lake Schwarzer Bach Lakeʺ has been formed, in the trough, along the channel. Therefore, the presented research work aimed to investigate the dynamic changes in the hydrologic and hydrogeologic systems due to mine subsidence in the area, and to develop a procedure for monitoring and forecasting the impacts of mining induced subsidence with time. The procedural steps implemented in the research work consists of developing a hydraulic numerical model and coupling it into an adjusted groundwater model that the physical flow processes in both systems are evaluated ...
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