西北某干旱区多级储水洼地地下水数值模拟

Groundwater Flow Numerical Simulation of Multilevel Basins in Arid Northwest China

西北某放射性废物处置场预选区,区域地下水系统包含多级独立第四系储水洼地,洼地出口以泉水排泄地下水,继而回渗补给下级洼地。根据含水层底板起伏特征,利用GMS模拟软件中的排水沟模块与溪流模块概化了泉水,通过泉流量校准与监测孔水位拟合,校正了研究区渗透系数、给水度、和储水率等水文地质参数,计算了地下水流速、流向以及地下水资源量。结果显示,研究区地下水由南向北东径流,东北部为最终排泄洼地,地下水流速缓慢,水资源相对匮乏,有利于放射性废物处置的安全。

There are several independent water storage basins of the local groundwater in a preselected radioactive waste disposal site in arid Northwest China.The outlets of the basin discharge the groundwater for spring,then recharge the next basin for infiltration.According to the fluctuation of the aquifer's base,spring was generalized by DRIAN and STREAM in GMS,and the regional hydrogeological parameters were calibrated against spring flow and the monitoring wells.The model was used to calibrate the current velocities,flow directions,and resources of groundwater.By the modeling,groundwater flow from south to north in the study area,the basins on the northeast is the last evacuation.The velocity of groundwater is slow and the resources amount of water is sparse,which is propitious to radioactive waste disposal.