基于DRASTIC方法的株洲市地下水防污性能评价

Evaluation of Groundwater Antifouling Performance in Zhuzhou Prefecture Based on DRASTIC Method

为了解株洲市地下水防污性能,基于区域自然地理和水文地质条件,运用传统的DRASTIC评价方法,选取地下水埋深(D)、含水层净补给量(R)、含水层介质(A)、土壤介质类型(S)、地形坡度(T)、包气带岩性(I)、含水层水力传导系数(C)7个参数作为评价指标,建立株洲市地下水防污性能评价体系。结果表明:株洲市地下水防污性能总体为差、中等,占研究区总面积的53.19%。防污性能好区分布面积占总面积的16.36%,防污性能较好区和防污性能较差区分布面积分别占总面积的15.82%、14.63%。株洲市地下水防污性能差区主要分布于湘江两岸的阶地和岩溶发育灰岩区,此区域应采取相应的防护措施,有效地保护地下水资源和环境。

In order to understand the antifouling performance of groundwater in Zhuzhou prefecture,based on regional natural geography and hydrogeological conditions,the traditional DRASTIC evaluation method was used to select seven parameters as evaluation indicators:groundwater depth(D),net recharge of aquifer(R),aquifer medium(A),soil medium type(S),terrain slope(T),rock type of aquifer(I),and hydraulic conductivity coefficient of aquifer(C),and establish an evaluation system for the antifouling performance of groundwater in Zhuzhou prefecture.The results indicate that the overall antifouling performance of groundwater in Zhuzhou prefecture is poor to moderate,accounting for 53.19% of the total area of the study area.The distribution area of areas with good antifouling performance accounts for 16.36% of the total area,while the distribution areas of areas with good antifouling performance and areas with poor antifouling performance account for 15.82%and 14.63% of the total area,respectively.The areas with poor groundwater antifouling performance in Zhuzhou prefecture are mainly distributed in the terraces and karst limestone areas on both sides of the Xiangjiang river.Corresponding protective measures should be taken in this area to effectively protect groundwater resources and the environment.