西龙河水源地岩溶地下水开采量评价

西龙河水源地位于邹城市西南一相对独立水文地质单元内。区内已建有多个水源地,目前处于一种供稍大于求的弱平衡状态。为了合理、安全地利用西龙河水源地岩溶地下水资源,在深入分析勘察区及周边水文地质条件基础上,分别设置新增开采量为3.50×104m3/d、3.10×104m3/d和2.80×104m3/d三个不同的开采方案,采用GWMS软件包之AQUA3D地下水流数值模拟模型软件,对该水源地岩溶水资源进行了数值模拟。模拟结果表明,考虑了实际存在的＂井损＂因素后,新增开采量2.80×104m3/d,其平水年抽水井最低水位标高为15.10m,较允许最低水位高3.1m,枯水年抽水井最低水位标高为12.20m,较允许最低水位高0.2m;平、枯水年因岩溶水开采而引起孔隙水水位下降分别为0.56m和1.86m,满足规定的开采约束条件,对当地农业生产与生态环境影响较小,是所设定的三个开采方案中最合理的一个。

Production evaluation of the groundwater for karstic water source field in Xilong River area

The water source field in the Xilong River area lies on a relatively separate hydro-geological unit at southwest Zoucheng city,where many water source fields have been built.The unit is currently in a weak balance where the supply is slightly over the demand.In order to exploit the karstic groundwater source of the water source field in the Xilong River area efficiently and safely,based on the hydrogeological conditions in the study area and the vicinity area that are carefully analyzed,three different water recovery plans are set up with the increasing recovery amount 35,000m3/d,31,000m3/d and 28,000m3/d respectively.After applying the AQUA3D(numerical simulation of groundwater with software package GWMS) to decide which of these three plans is most reasonable,it is concluded that the increment 28,000m3/d production can be made in Xilong River water source field in view of its relatively small influence on the local agricultural and ecological environment,in details,its lowest water level of wells in normal years is 15.10m,which is 3.1 meters higher than the minimum allowance,and its highest water level of wells in dry years is 12.20m which is 0.2 meters higher than the minimum allowance;the pore hydraulic head decrease caused by the exploitation of karstic groundwater in normal and dry years are 0.56m and 1.86m respectively,which satisfy the requirements of the recovery constraint conditions.