Potential evaluation of river bank infiltration along the Second Songhuajiang River

Based on the evaluation of the suitability for river bank infiltration along the Second Songhuajiang River and the basic geologic and hydrogeological conditions of the study area, the hydrogeological conceptual model and the corresponding mathematical model are established, and the numerical model of groundwater flow based on Visual MODFLOW is formulated. The drawdown of groundwater level of 1/3 of less than the aquifer thickness is taken as the criterion. By making the predicted groundwater flow field as close as possible to the flow field under the conditions of the permissible drawdown, the allowable exploitation quantity of groundwater under the condition of RBF along the Second Songhua River is obtained. The results show that under the conditions of the current year, the exploitation intensity of groundwater resources is small. However, under the condition of exploitation near the river, the groundwater exploitation potential of each suitable area is as high as 140×104 m3/d, and the allowable exploitation of groundwater is large under the annual precipitation frequency. The interaction of groundwater-surface water will be influenced, but there will be no side effects on the ecological function of the river.