Numerical simulation for groundwater distribution after mining in Zhuanlongwan mining area based on visual MODFLOW

With large-scale coal resources being discovered and mined in mid-west China, latent environment problems gradually come into view. In arid and semi-arid region, environmental impact assessment of mining on groundwater distribution is a vital mission before mining works. In Zhuanlongwan Mining Area (ZMA), data of surface elevation were performed by remote sensing information and ArcGIS. The study area was divided into clayey fine sand, aeolian loose sand, weathered fracture, and low permeability zones, according to hydrologic conductivities and borehole data. By simplifying as a single-layer system of phreatic groundwater and optimizing with geological parameters in each unit zone, a reasonable model of the groundwater distribution in steady state was then found and calibrated. Combined with local climate, variable groundwater behavior was discussed in relation to different precipitations which reduced the loss of the drain in degrees. The study results may give benefit and safety to management in mining, as well as being refined in the future.

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