A GIS-based DRASTIC model for assessing shallow groundwater vulnerability in the Zhangye Basin, northwestern China
A GIS-based DRASTIC model for assessing shallow groundwater vulnerability in the Zhangye Basin, northwestern China
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DOI：
10.1007/s00254-008-1421-y
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发表时间：
2009-05
期刊：
影响因子：
--
通讯作者：
X. Wen;Jun Wu;J. Si
中科院分区：
文献类型：
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作者：
X. Wen;Jun Wu;J. Si
地下水的脆弱性是评估地下水污染风险和制定保护地下水质量的管理办法的基石。基于专业模型（DRASTIC模型）和地理信息系统（GIS）技术，对张掖盆地浅层地下水脆弱性进行了评价。DRASTIC模型使用七个环境参数（水深、净补给、含水层介质、土壤介质、地形、渗流带的影响和水力传导性）来描述水文地质环境并评估含水层的脆弱性。根据浅层地下水脆弱性评价结果，将张掖盆地划分为3个区域：地下水脆弱性低风险区（风险指数<120）、地下水脆弱性中等风险区（风险指数120-140）和地下水脆弱性高风险区（风险指数>140）。在自然条件下，张掖盆地地下水中、高脆弱性风险区主要分布在地下水补给区和重要城市。张掖盆地地下水高、中、低脆弱性风险区分别占研究区面积的17%、21%和62%。
Groundwater vulnerability is a cornerstone in evaluating the risk of groundwater contamination and developing management options to preserve the quality of groundwater. Based on the professional model (DRASTIC model) and geographical information system (GIS) techniques, this paper carries out the shallow groundwater vulnerability assessment in the Zhangye Basin. The DRASTIC model uses seven environmental parameters (depth to water, net recharge, aquifer media, soil media, topography, impact of vadose zone, and hydraulic conductivity) to characterize the hydrogeological setting and evaluate aquifer vulnerability. According to the results of the shallow groundwater vulnerability assessment, the Zhangye Basin can be divided into three zones: low groundwater vulnerability risk zone (risk index <120); middle groundwater vulnerability risk zone (risk indexes 120–140) and high risk zone (risk index >140). Under the natural conditions, the middle and high groundwater vulnerability risk zones of the Zhangye Basin are mainly located in the groundwater recharge zones and the important cities. The high, middle and low groundwater vulnerability risk zones of the Zhangye Basin cover around 17, 21 and 62% of study area, respectively.