湟水河小流域地下水脆弱性评价

Groundwater Vulnerability Assessment on Small Watershed Scale of the Huangshui River

湟水河地处西北高原干旱地区,针对其流域地下水的特点,选取包气带介质、水位埋深、含水层介质、含水层厚度、净补给量和地形坡度共6个指标并运用三标度AHP法为各个指标赋予权重,构建了改进的DRASTIC模型。运用改进DRASTIC模型对湟水河的小流域范围的地下水脆弱性进行了评价。结果表明,湟水河沿岸的部分地区和西堡村附近地下水脆弱性高,地下水易受到污染。与传统DRASTIC模型相比,改进模型与实际情况更加吻合。

The Huangshui River is located in arid region of northwest plateau.Based on groundwater characteristics of the watershed,this paper selected six factors：the impact of vadose zone,groundwater depth,aquifer type,aquifer thickness,net recharge and topography to build up an improved DRASTIC model by using AHP to give the weight of each index.Using improved DRASTIC model to evaluate the grotmdwater vulnerability in small watershed scale of the Huangshui River,the results showed that the high groundwater vulnerability area distributed partly along the Huangshui River and the Xipu village,and the groundwater was vulnerable to pollution.Compared with the traditional DRASTIC model,the improved DRASTIC model is more consistent with the actual condition.