石门沟水源地的地下水脆弱性评价

对石门沟水源地地下水系统进行了脆弱性评价,以期为该区地下水资源的合理利用和科学管理提供技术支持。采用参数系统法中的DRASTIC指标,对研究区进行分区并对评价因子评分,通过构建矩阵进行运算得出脆弱性指数。结果发现,石门沟水源地地下水系统的脆弱性指数介于100～128之间,为低脆弱性和中等脆弱性。将整个研究区划分为两类6个区域,其脆弱性呈现由东北向西南逐次减弱的趋势。研究表明,岩溶发育地区的地下水脆弱性较其它岩性地区偏弱。地下水系统的脆弱性由含水层固有属性因子决定,但人为外部因素的改变也会对其造成极大的影响。

Evaluation of Groundwater Vulnerability in Shimengou Water Source Area

We assessed the vulnerability of the groundwater system of Shimengou,in order to provide scientific support for rational utilization and managements of the groundwater resources of the area.The study area was divided and then scored for each evaluation factor using indexes of depth of water,net recharge,aquifer media,soil media,topography,impact of the vadose zone,and hydraulic conductivity of the aquifer (DRASTIC).The vulnerability index was calculated through building matrix.Results showed that the groundwater vulnerability index was between 100 to 128 in the study region,which was between the low and medium range.The study region was divided into six sub-regions in two groups,and the vulnerability showed a decreasing trend from northeast to southwest.In general,groundwater vulnerability in the karst area is less severe than that of other lithologic areas.Groundwater vulnerability is determined by intrinsic attributes of aquifer,but it can be affected by external factors exerted by the human activities.