青海省盐湖集团供水二期水源地数值模拟

针对山前冲洪积扇傍河水源地共有的水文地质条件,建立地下水流数学模型,采用Visual Modflow软件,选取极富水地段进行地下水数值模拟研究。在综合分析格尔木河冲洪积扇水文地质条件基础上,确定三维边界条件,建立水文地质条件概念模型及数学模型,通过对地下水梯度场、降速场与实测资料的识别与验证,模拟的流场形态与观测值及地下水动态拟合度较高,符合研究区水文地质条件。模型对10年内丰、平、枯水期降水频率下的开采方案结果及水均衡状态进行了预测,结果表明,拟建水源地所需的可开采水量(新增13.2万m3/d)基本可行。

Numerical Simulation of the Second Period Water Source Area of Water Supply for Salt Lake Group in Qinghai Province

Based on the common hydrogeological conditions in the riverside water source area of the piedmont alluvial-pluvial fan,a numerical groundwater flow model was established using Visual MODFLOW to simulate the groundwater flow conditions in the water-rich area.According to the comprehensive analysis of the hydrogeological conditions in the Ge’ermu alluvial-pluvial fan,the three-dimensional boundary conditions were determined and the conceptual model and numerical model were constructed for this area.In terms of the identification and verification of the relationship between the simulated and measured groundwater gradient field and velocity field,the simulated groundwater flow conditions were similar to the measured ones for the study area.The numerical model was used to simulate the exploitation schemes and predict the water balance under three conditions,the wet period,normal flow period,and low flow period,in 10 years.The model results showed that the required groundwater exploitation amount(new 132000 m3/d) is reasonable for the proposed water source area.