A GIS-based DRASTIC model for assessing shallow groundwater vulnerability in the Zhangye Basin,northwestern China |
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| Authors: | Xiaohu Wen Jun Wu Jianhua Si |
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| Institution: | 1.Yantai Institute of Coastal Zone Research for Sustainable Develomnent,Chinese Academy of Science,Yantai,Shandong Province,People’s Republic of China;2.School of Resources and Environmental Engineering,Hefei University of Technology,Hefei,People’s Republic of China;3.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Science,Lanzhou,People’s Republic of China |
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| Abstract: | 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. |
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| Keywords: | Vulnerability Shallow groundwater DRASTIC GIS Zhangye Basin Northwestern China |
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