Numerical Assessment of Groundwater Flowpaths below a Streambed in Alluvial Plains Impacted by a Pumping Field

The quality of the water from a riverbank well field is result mixing ratios between surface and local regional groundwater. ratio controlled by complex processes involved in water–groundwater interactions. In addition, drawdown groundwater level greatly determines head differences river groundwater, as flowpath inside alluvial plain, which subsequently impacts origin well. common view, flows both sides valley towards river, divide located at middle river. Here, we studied standard case connected with an aquifer exploited linear pumping on one riverbank, proposed to determine physical parameters controlling occurrence flow below bank other (cross-riverbank flow). For this purpose, 2D saturated–unsaturated numerical model used analyze streambed. alternative scenarios interactions considered here are based variable gradient conditions, streambed clogging thickness width (aspect ratio). Parameters such aspect properties layer play crucial role flow, its magnitude increases clogging. We demonstrate that for 0.2, cross-riverbank negligible. Conversely, when exceeds 0.7, 20% comes can even exceed contribution reaches 0.95. situation, contaminant transfers opposite should not be neglected low