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A high-resolution nitrate vulnerability assessment of sandy aquifers (DRASTIC-N)
Journal of Environmental Management ( IF 8.7 ) Pub Date : 2020-09-21 , DOI: 10.1016/j.jenvman.2020.111330
Denitza D. Voutchkova , Jörg Schullehner , Per Rasmussen , Birgitte Hansen

Groundwater protection against agricultural diffuse nitrate pollution is of paramount importance for safeguarding groundwater-dependent aquatic ecosystems and protecting human health by securing clean groundwater for drinking water production. Nitrate vulnerability assessment of aquifers is the core of a scientifically sound strategy for management and protection of groundwater by authorities. A multitude of methods exists for assessing intrinsic aquifer vulnerability. The objective of this paper is to develop a nitrate-specific groundwater vulnerability assessment method based on the globally recognized DRASTIC method, which was developed by the US Environmental Protection Agency in the 1980s. We propose a new method “DRASTIC-N″ for assessing aquifer nitrate vulnerability, which for the first time expands the seven original geological and hydrogeological parameters with a geochemical parameter for redox condition. The development of DRASTIC-N is based on the longstanding Danish practice of performing detailed groundwater mapping based on dense sampling of geophysical, geological, and geochemical data. DRASTIC-N is compared to the widely used and documented Danish nitrate vulnerability assessment method SCANVA in a study area where the primary aquifer used for drinking water production is composed of heterogeneous sandy glacial deposits. Both SCANVA and DRASTIC-N result in vulnerability maps, which show similar patterns of nitrate vulnerability with a fair overall agreement of 71%. DRASTIC-N provides a framework for systematic and transparent application, which can facilitate stakeholder involvement and help authorities in groundwater protection and decision-making with regards to nitrate pollution. DRASTIC-N is suitable for nitrate vulnerability assessments of glacially deposited sandy aquifers, an abundant and important water resource worldwide, potentially threatened by nitrate pollution from anthropogenic activities.



中文翻译:

沙质含水层的高分辨率硝酸盐脆弱性评估(DRASTIC-N)

防止农业中的硝酸盐弥散污染的地下水保护对于确保依赖地下水的水生生态系统并通过确保饮用水生产的清洁地下水来保护人类健康至关重要。含水层的硝酸盐脆弱性评估是当局管理和保护地下水的科学合理策略的核心。存在用于评估固有含水层脆弱性的多种方法。本文的目的是在全球公认的DRASTIC方法的基础上,开发一种针对硝酸盐的地下水脆弱性评估方法,该方法由美国环境保护署于1980年代开发。我们提出了一种新的方法“ DRASTIC-N”来评估硝酸盐含水层的脆弱性,首次利用氧化还原条件的地球化学参数扩展了七个原始地质和水文地质参数。DRASTIC-N的开发基于丹麦的长期实践,该实践基于对地球物理,地质和地球化学数据的密集采样来执行详细的地下水测绘。在一个研究区域,将DRASTIC-N与广泛使用并有文献记载的丹麦硝酸盐脆弱性评估方法SCANVA进行了比较,该研究区域的饮用水生产所用的主要含水层是非均质的沙质冰川沉积物。SCANVA和DRASTIC-N均会产生漏洞图,这些图显示了相似的硝酸盐漏洞模式,总体公平率为71%。DRASTIC-N提供了系统透明的应用程序框架,这可以促进利益相关者的参与,并帮助当局进行有关硝酸盐污染的地下水保护和决策。DRASTIC-N适用于冰川沉积的砂质含水层的硝酸盐脆弱性评估,这是世界范围内丰富而重要的水资源,可能受到人为活动造成的硝酸盐污染的威胁。

更新日期:2020-09-22
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