Improving the characterization of Quaternary deposits for groundwater vulnerability assessments using maps of recharge and attenuation potential
Improving the characterization of Quaternary deposits for groundwater vulnerability assessments using maps of recharge and attenuation potential
复制标题
使用补给和衰减潜力图改进第四纪沉积物的表征，以进行地下水脆弱性评估
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
P. McConvey
中科院分区：
文献类型：
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作者：
K. Griffiths;A. M. MacDonald;N. Robins;J. Merritt;S. Booth;D. Johnson;P. McConvey
摘要 对于被冰川等高度变化的表层沉积物掩盖的基岩含水层，评估含水层的脆弱性是很困难的。目前的许多地下水脆弱性图及其所依据的地质图没有充分考虑浅层沉积物特征的区域和垂直变化。这里提出了一种表征表层沉积物的补给潜力和污染物滞缓潜力的新方法，该方法以系统的方式捕获原始地质和水文地质专家知识。该方法使用第四纪域及其描述、基岩岩性和浅表沉积物的厚度修改现有的浅表地质图，并应用有关浅表地质和基岩岩性的附加信息。该方法的核心是一个矩阵，它允许以系统和可追溯的方式整合当地地质和水文地质知识。这种与比例无关的方法已在 1:625 000 比例下进行了试点，以制作英国的补给和衰减潜力地图。针对多项指标（HOST 数据、苏格兰漏洞筛选工具和硝酸盐数据）的初步验证令人鼓舞。环境局正在使用该方法作为其脆弱性评估的一部分，以根据水框架指令的要求来描述地下水体的特征。
Abstract Assessing aquifer vulnerability is difficult for bedrock aquifers concealed by highly variable superficial deposits such as glacial till. Many current groundwater vulnerability maps, and the geological maps on which they are based, do not adequately account for regional and vertical variations in the characteristics of superficial deposits. A new method for characterizing recharge potential and contaminant retardation potential of superficial deposits is presented here, which captures primary geological and hydrogeological expert knowledge in a systematic manner. The method modifies existing superficial geology maps using Quaternary domains and their descriptions, bedrock lithology and thickness of superficial deposits, and applies additional information on superficial geology and bedrock lithology. Central to the method is a matrix that allows local geological and hydrogeological knowledge to be incorporated in a systematic and traceable manner. The scale-independent method has been piloted at 1:625 000 scale to produce maps of recharge and attenuation potential for Great Britain. Preliminary verification against several indicators (HOST data, the Scottish vulnerability screening tool, and nitrate data) has been encouraging. The method is being used by the Environment Agency as part of its vulnerability assessments for the characterization of groundwater bodies as required by the Water Framework Directive.