Scholarlink

<p>Groundwater resources in semi-arid crystalline bedrock regions are essential, yet challenging to locate due to pronounced subsurface heterogeneity. In the Abéché Basin (Chad), traditional prospecting methods achieve low drilling success rates (~ 40%). This study demonstrates the effectiveness of an integrated 2D and 3D Electrical Resistivity Tomography (ERT) approach for improving groundwater exploration in this urban Sahelian setting. We acquired 20 two-dimensional (2D) profiles and seven three-dimensional (3D) survey blocks across ten neighborhoods. Validation against eight boreholes confirmed a success rate of 75% (yield &gt; 1&#xa0;m<sup>3</sup>/h), significantly outperforming traditional methods. A significant negative correlation was established between bulk resistivity and yield. ERT identified low-resistivity anomalies (&lt; 200&#xa0;Ω·m) associated with fractured zones proximal to temporary watercourses, delineating preferential recharge pathways. This work provides a validated, replicable framework that positions 3D ERT as a robust tool for sustainable groundwater mapping in complex crystalline aquifers, directly supporting water security goals in Sahelian urban areas.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Three-dimensional electrical resistivity tomography for groundwater mapping in the Abéché Basin, Chad

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年2月21日

查看全文
  • Moustapha Dinar Ibrahim,
  • Abderamane Hamit,
  • A. L.-djazouli Ouchar Mahamat,
  • Arrakhais Abakar Bourma,
  • Diab Ahmat

摘要

Groundwater resources in semi-arid crystalline bedrock regions are essential, yet challenging to locate due to pronounced subsurface heterogeneity. In the Abéché Basin (Chad), traditional prospecting methods achieve low drilling success rates (~ 40%). This study demonstrates the effectiveness of an integrated 2D and 3D Electrical Resistivity Tomography (ERT) approach for improving groundwater exploration in this urban Sahelian setting. We acquired 20 two-dimensional (2D) profiles and seven three-dimensional (3D) survey blocks across ten neighborhoods. Validation against eight boreholes confirmed a success rate of 75% (yield > 1 m3/h), significantly outperforming traditional methods. A significant negative correlation was established between bulk resistivity and yield. ERT identified low-resistivity anomalies (< 200 Ω·m) associated with fractured zones proximal to temporary watercourses, delineating preferential recharge pathways. This work provides a validated, replicable framework that positions 3D ERT as a robust tool for sustainable groundwater mapping in complex crystalline aquifers, directly supporting water security goals in Sahelian urban areas.