马鞍山市地下水水源地应急供水水流模拟研究

为评估马鞍山市应急水源地的供水能力,结合现场水文地质勘察成果,概化了区域水文地质模型,采用GMS软件进行应急开采条件下的地下水渗流场模拟预测。计划布置抽水井75口,模型预测了总开采量15万m^3/d时区域地下水流场的时空分布特征。计算结果表明各水源地应急开采过程中,水源地周围降落漏斗中心降深逐渐增大,胡庄和秦河村水源地由于含水层相对较薄,远离区域主要的补给水源(长江),供水能力较差,降落漏斗中心埋深最大;新锦村靠近长江,抽水井数量相对较少,降落漏斗中心埋深最小。经过365 d抽水,区域降落漏斗最大降深达4.61 m,降落漏斗最大半径达3 000 m。马鞍市拟选应急水源地的供水能力可以达到15万m^3/d,但是水源地应布置在含水层厚度大,补给可靠的区域。

Simulation of Seepage Field Under an Emergency Condition of Groundwater Supply at Maanshan City

In order to evaluate the water supply capacity of an emergency water sources in Maanshan city, a regional hydrogeological model was generalized based on the on-site investigation results, and GMS was adopted to simulate and predict the groundwater level under emergency conditions. It’s planning to build 75 water intake wells to reach an emergency water intake amount of 150 000 m^3/d. The results show that during the emergency scenario, the water level drop will be increasing. The depth of the center of the landing funnel near Huzhuang and Qinhe Village water sources is the largest due to the thin aquifer and long distance from recharge source(the Yangtse River). The depth of the center of the landing funnel near Xinjin Village water sources is the smallest due to relatively few pumping wells and near the Yangtse River. After 365 d pumping, the maximum drop depth of the area drop funnel is 4.61 m, and the maximum radius of the drop funnel was 3 000 m. In general, the amount of water can be guaranteed under emergency condition. However, it is necessary to select areas with large aquifer thickness and reliable recharge source.