基于GMS的日喀则市区地下水数值模拟

根据日喀则市区地下水开采现状与含水系统结构特征,建立了二维地下水数值模型,利用研究区的观测井实测水位对模型进行校正和检验,并开展了模型参数的敏感性分析,发现渗透系数对模拟结果最为敏感。进一步将校准后的数值模型用于预测研究区未来逐步扩大化开采地下水条件下的地下水流场。结果表明,与现状条件相比,2030年研究区各地下水水源地的地下水位表现为下降趋势,其地下水位平均下降2.25m,尤其在北郊水厂抽水井附近最大降深超过7m。结果可为日喀则市东嘎水库兴建的必要性论证与备用水源地的建设提供依据。

GMS-Based Numerical Simulation of Groundwater in Shigatse City

Based on the current exploitation status and the structural characteristic of aquifer system, this paper established a two-dimensional numerical model for simulating the groundwater system in Shigatse City. The model was calibrated and validated using the measured groundwater level at the observation well in the study area, and then the calibrated model was used to predict groundwater changes in the aquifer. Sensitivity analysis in the hydrogeology parameters shows that the model is very sensitive to the hydraulic conductivity. The prediction results show that the groundwater level can be reduced by 2.25 m, and the maximum level near the pumping well in the northern suburbs exceeds 7 m. The results provide a scientific implication for the construction of the Dongpu Reservoir and water resources management.