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A Novel Approach to Harmonize Vulnerability Assessment in Carbonate and Detrital Aquifers at Basin Scale
Water ( IF 3.4 ) Pub Date : 2020-10-23 , DOI: 10.3390/w12112971
Leticia Baena-Ruiz , David Pulido-Velazquez

The DRASTIC (D: Depth to water; R: Net recharge; A: Aquifer media; S: Soil media; T: Topography; I: Impact of vadose zone; C: Hydraulic conductivity) index is usually applied to assess intrinsic vulnerability in detrital and carbonate aquifers, although it does not take into account the particularities of karst systems as the COP (C: Concentration of flow; O: Overlying layers above water table; P: precipitation) method does. In this paper we aim to find a reasonable correspondence between the vulnerability maps obtained using these two methods. We adapt the DRASTIC index in order to obtain reliable assessments in carbonate aquifers while maintaining its original conceptual formulation. This approach is analogous to the hypothesis of “equivalent porous medium”, which applies to karstic aquifers the numerical solution developed for detrital aquifers. We applied our novel method to the Upper Guadiana Basin, which contains both carbonate and detrital aquifers. Validation analysis demonstrated a higher confidence in the vulnerability assessment provided by the COP method in the carbonate aquifers. The proposed method solves an optimization problem to minimize the differences between the assessments provided by the modified DRASTIC and COP methods. Decision trees and spatial statistics analyses were combined to identify the ranges and weights of DRASTIC parameters to produce an optimal solution that matches the COP vulnerability classification for carbonate aquifers in 75% of the area, while maintaining a reliable assessment of the detrital aquifers in the Basin.

中文翻译:

协调盆地尺度碳酸盐岩和碎屑含水层脆弱性评估的新方法

DRASTIC(D:水深;R:净补给量;A:含水层介质;S:土壤介质;T:地形;I:包气带的影响;C:水力传导率)指数通常用于评估碎屑的内在脆弱性和碳酸盐含水层,尽管它没有像 COP(C:流量浓度;O:地下水位以上的上覆层;P:降水)方法那样考虑岩溶系统的特殊性。在本文中,我们旨在找到使用这两种方法获得的漏洞图之间的合理对应关系。我们调整了 DRASTIC 指数,以便在保持其原始概念公式的同时获得对碳酸盐含水层的可靠评估。这种方法类似于“等效多孔介质”假设,该假设适用于岩溶含水层,为碎屑含水层开发的数值解。我们将我们的新方法应用于上瓜迪亚纳盆地,该盆地同时包含碳酸盐和碎屑含水层。验证分析表明,COP 方法在碳酸盐含水层中提供的脆弱性评估具有更高的可信度。所提出的方法解决了一个优化问题,以最小化修改后的 DRASTIC 和 COP 方法提供的评估之间的差异。决策树和空间统计分析相结合,以确定 DRASTIC 参数的范围和权重,以生成与该地区 75% 的碳酸盐含水层的 COP 脆弱性分类相匹配的最佳解决方案,同时保持对盆地碎屑含水层的可靠评估. 验证分析表明,COP 方法在碳酸盐含水层中提供的脆弱性评估具有更高的可信度。所提出的方法解决了一个优化问题,以最小化修改后的 DRASTIC 和 COP 方法提供的评估之间的差异。决策树和空间统计分析相结合,以确定 DRASTIC 参数的范围和权重,以生成与该地区 75% 的碳酸盐含水层的 COP 脆弱性分类相匹配的最佳解决方案,同时保持对盆地碎屑含水层的可靠评估. 验证分析表明,COP 方法在碳酸盐含水层中提供的脆弱性评估具有更高的可信度。所提出的方法解决了一个优化问题,以最小化修改后的 DRASTIC 和 COP 方法提供的评估之间的差异。决策树和空间统计分析相结合,以确定 DRASTIC 参数的范围和权重,以生成与该地区 75% 的碳酸盐含水层的 COP 脆弱性分类相匹配的最佳解决方案,同时保持对盆地碎屑含水层的可靠评估. 所提出的方法解决了一个优化问题,以最小化修改后的 DRASTIC 和 COP 方法提供的评估之间的差异。决策树和空间统计分析相结合,以确定 DRASTIC 参数的范围和权重,以生成与该地区 75% 的碳酸盐含水层的 COP 脆弱性分类相匹配的最佳解决方案,同时保持对盆地碎屑含水层的可靠评估. 所提出的方法解决了一个优化问题,以最小化修改后的 DRASTIC 和 COP 方法提供的评估之间的差异。决策树和空间统计分析相结合,以确定 DRASTIC 参数的范围和权重,以产生与该地区 75% 的碳酸盐含水层的 COP 脆弱性分类相匹配的最佳解决方案,同时保持对盆地碎屑含水层的可靠评估.
更新日期:2020-10-23
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