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Local Scale Groundwater Vulnerability Assessment with an Improved DRASTIC Model
Natural Resources Research ( IF 5.4 ) Pub Date : 2021-02-23 , DOI: 10.1007/s11053-021-09839-z
Santanu Mallik , Tridip Bhowmik , Umesh Mishra , Niladri Paul

The rapid increase in demand and consumption of groundwater in the past few decades has imposed colossal pressure on the stakeholders responsible for groundwater management. Assessment of groundwater vulnerability and knowledge about hydrogeological settings are crucial for a particular region, especially at a local scale, to manage groundwater resources effectively. The present study aimed to develop a modified DRASTIC model to demarcate groundwater vulnerability zones based on experimental analysis of field samples to make the model more feasible at local scale. Four techniques were implemented in this study to determine groundwater vulnerability zones: (a) DRASTIC; (b) DRASTIC–AHP (analytic hierarchy process); (c) Modified DRASTIC; (d) Modified DRASTIC–AHP. The best groundwater vulnerability model was determined based on validation results with groundwater nitrate concentration. The comparative assessment showed that the Modified DRASTIC–AHP outperformed the other models. More than 50% of the study area was classified as ‘high’ (33.06%) and ‘very high’ (21.31%) groundwater vulnerability zones. The vulnerability map shows that high vulnerable zones dominate in the northwestern part and in some portions of the floodplain near central part of the study area. The results of this study envision that inclusion of experimentally derived parameters can be used to modify the conventional DRASTIC model and obtain better results at local scale.



中文翻译:

利用改进的DRASTIC模型评估局部规模的地下水脆弱性

在过去的几十年中,地下水的需求和消耗量的迅速增加给负责地下水管理的利益相关者带来了巨大的压力。评估地下水脆弱性和有关水文地质环境的知识对于特定地区(尤其是在地方范围内)有效管理地下水资源至关重要。本研究旨在基于田间样本的实验分析,开发一种改进的DRASTIC模型来划定地下水脆弱区域,以使该模型在本地范围内更可行。在这项研究中采用了四种技术来确定地下水的脆弱性区域:(a)DRASTIC;(b)DRASTIC-AHP(层次分析法);(c)修改后的DRASTIC;(d)修改后的DRASTIC-AHP。基于对地下水硝酸盐浓度的验证结果,确定了最佳的地下水脆弱性模型。对比评估表明,改进的DRASTIC-AHP优于其他模型。超过50%的研究区域被归类为“高”(33.06%)和“非常高”(21.31%)地下水脆弱区。脆弱性地图显示,高脆弱性区域在研究区域的中部附近西北部和洪泛区的某些地区占主导地位。这项研究的结果设想,可以使用包含实验得出的参数来修改常规DRASTIC模型,并在局部范围内获得更好的结果。超过50%的研究区域被归类为“高”(33.06%)和“非常高”(21.31%)地下水脆弱区。脆弱性地图显示,高脆弱性区域在研究区域的中部附近西北部和洪泛区的某些地区占主导地位。这项研究的结果设想,可以使用包含实验得出的参数来修改常规DRASTIC模型,并在局部范围内获得更好的结果。超过50%的研究区域被归类为“高”(33.06%)和“非常高”(21.31%)地下水脆弱区。脆弱性地图显示,高脆弱区在西北部以及研究区域中心附近的洪泛区某些地区占主导地位。这项研究的结果设想,可以使用包含实验得出的参数来修改常规DRASTIC模型,并在局部范围内获得更好的结果。

更新日期:2021-02-23
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