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<p>To ascertain the groundwater flow, hydrological conditions, and availability of water for plant growth, the hydrogeological system of a farmed fen wetland in low-latitude tropical Sudan savannah climate, geologically within south-west Nigeria basement complex, was researched. In order to achieve this, the results of the ground-truth geotechnical analyses of the moisture contents, Atterberg limits, grain-size distribution, porosity, and hydraulic conductivity of soils recovered from 3.0-m-deep bores, as well as depths control from two monitoring wells, were used to calibrate the results of the interpretations of the surficial and non-invasive geophysical methods employed: electrical resistivity tomography (ERT) and time-domain-induced polarization (TDIP). The latter geophysical method additionally enabled delineation of sand/gravel soil from clayey soil. The wetland was covered in soils with moisture contents between 10 and 62%, which increased with depth as evidenced by decreasing resistivity on inverted ERT sections, a relatively thick (2.8–3.8&#xa0;m) water saturation zone diagnosis of low resistivity, chargeability, and normalized chargeability of 0.011–16.4 Ωm, 0.212–4.87&#xa0;ms, and 0.0321–0.573&#xa0;ms, respectively, as revealed by their corresponding inverted models, and permeable weathered zones (2.5–22.5&#xa0;m thick) that could support ground water up-flow. These show that both shallow- and deep-rooted plants have access to water. Infiltration of the northward–southward-flowing groundwater into the weathered zones was made possible by structural fractured/joint system of the weathered zone. The lateral alternation of the weathered zone with highly resistive rocks ensures compartmentalization and maximum detention of the infiltrated groundwater within the fractured/weathered rock aquifer.</p>

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Hydrogeological system of a cultivated fen wetland in south-western Nigeria crystalline basement complex

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Moruffdeen Adedapo Adabanija,
  • Adeola Emmanuel Adeleke,
  • Riliwan Damilola Abioye,
  • Janet Abiodun Ojeniyi,
  • Muhammad Oyewole Surajudeen,
  • Kabiru Aremu Atobatele,
  • Victoria Omobosede Solomon

摘要

To ascertain the groundwater flow, hydrological conditions, and availability of water for plant growth, the hydrogeological system of a farmed fen wetland in low-latitude tropical Sudan savannah climate, geologically within south-west Nigeria basement complex, was researched. In order to achieve this, the results of the ground-truth geotechnical analyses of the moisture contents, Atterberg limits, grain-size distribution, porosity, and hydraulic conductivity of soils recovered from 3.0-m-deep bores, as well as depths control from two monitoring wells, were used to calibrate the results of the interpretations of the surficial and non-invasive geophysical methods employed: electrical resistivity tomography (ERT) and time-domain-induced polarization (TDIP). The latter geophysical method additionally enabled delineation of sand/gravel soil from clayey soil. The wetland was covered in soils with moisture contents between 10 and 62%, which increased with depth as evidenced by decreasing resistivity on inverted ERT sections, a relatively thick (2.8–3.8 m) water saturation zone diagnosis of low resistivity, chargeability, and normalized chargeability of 0.011–16.4 Ωm, 0.212–4.87 ms, and 0.0321–0.573 ms, respectively, as revealed by their corresponding inverted models, and permeable weathered zones (2.5–22.5 m thick) that could support ground water up-flow. These show that both shallow- and deep-rooted plants have access to water. Infiltration of the northward–southward-flowing groundwater into the weathered zones was made possible by structural fractured/joint system of the weathered zone. The lateral alternation of the weathered zone with highly resistive rocks ensures compartmentalization and maximum detention of the infiltrated groundwater within the fractured/weathered rock aquifer.