Insights from electrical resistivity tomography on the hydrogeological interaction between sand dams and the weathered basement aquifer

IF 2.2 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Applied Geophysics Pub Date : 2024-11-01 DOI:10.1016/j.jappgeo.2024.105542

Hannah Ritchie , Ian Holman , Justus Nyangoka , Paul Bauman , Alison Parker

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Abstract

Sand dams, composed of recent alluvial aquifers behind concrete dam walls, are a water management technique in drylands. However, their level of hydraulic connectivity with their surrounding weathered basement aquifer is debated. This study aims to constrain this hydrogeological uncertainty in order to better understand their ability to meet water needs and improve dryland water security. The study is the first to use 2D geophysics (Electrical Resistivity Tomography) to provide evidence of seepage from sand dams at three mature and three newly built sites. A generally greater hydraulic connectivity was found between sand dams and their surrounding aquifer than has been assumed in some previous studies, with sites providing at least some local recharge rather than existing as isolated storage structures. This improved understanding is beneficial for both site selection and the performance of sand dams and can help ensure that maximum benefits are derived from the construction of a sand dam depending on its intended purpose.

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电阻率断层扫描对砂坝与风化基底含水层之间水文地质相互作用的启示

沙坝由混凝土坝壁后的新近冲积含水层组成，是干旱地区的一种水管理技术。然而，它们与周围风化基底含水层之间的水力连接程度还存在争议。本研究旨在限制这种水文地质的不确定性，以便更好地了解它们满足用水需求和提高旱地水安全的能力。该研究首次使用二维地球物理（电阻率层析成像）技术，为三个成熟的和三个新建的砂坝提供渗流证据。研究发现，沙坝与周围含水层之间的水力联系比以往一些研究中假定的要大，这些地点至少提供了一些局部补给，而不是作为孤立的蓄水结构存在。这种认识的提高有利于沙坝的选址和性能，并有助于确保根据沙坝的预期目的，从沙坝建设中获得最大效益。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Applied Geophysics 地学-地球科学综合

CiteScore

3.60

自引率

10.00%

发文量

274

审稿时长

4 months

期刊介绍： The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.