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首页> 外文期刊>International Journal of Water Resources and Environmental Engineering >An assessment of hydrogeologic characteristics of Bamikemos hard rock terrain using geophysical techniques
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An assessment of hydrogeologic characteristics of Bamikemos hard rock terrain using geophysical techniques

机译：利用地球物理技术评估巴密科莫斯硬岩地形的水文地质特征

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Resistivity depth soundings integrated with the very low-frequency electromagnetic (VLF-EM) profiling and some hydrogeologic measurements were conducted at Bamikemo, Nigeria. The exercise attempted to evaluate the groundwater potential of the main water supply area. The integrated approach enabled the delineation of the regolith/weathered layer containing the overburden aquifers from the hard rock housing the bedrock aquifers. The study reveals that the thickness of the overburden/weathered layer ranges from 2.4 to 24.5 m, with average value of 12.6 m. Static water level also varies from 0.2 to 14 m in the area. The potentiometric surface map constitutes groundwater occurrence guide for the area. In all the fifteen electromagnetic (EM) profiles established, prominent fractures in varying magnitudes were only in two profiles. A comparative correlation with the appropriate geoelectric sections show that resistivity parameters around the EM-delineated bedrock fractures within the granite/granite-gneiss bedrock in the area which reveals that the bedrock is not considerably decomposed or fractured to hold significant quantities of groundwater. The prominent EM anomalies at these locations are apparently attributable to fairly thick unconsolidated weathered mantle. Consequently, the weathered overburden in the area, especially the central/western segment is considered groundwater prospect specific area. Beyond the results concerning the main objectives of the survey, the study also justified the reliability in integrated application of hydrogeologic, VLF-EM and depth sounding data in locating groundwater prospect specific areas in hard rock terrains.
机译：在尼日利亚的巴米凯莫进行了电阻率深度探测，并结合了非常低频的电磁（VLF-EM）剖面和一些水文地质测量。该练习试图评估主要供水区域的地下水潜力。集成的方法能够从容纳基岩含水层的硬岩中划定出包含上覆含水层的重碎石/风化层。研究表明，覆盖层/风化层的厚度范围为2.4至24.5 m，平均值为12.6 m。该地区的静态水位也从0.2到14 m不等。电位表面图构成了该地区的地下水发生指南。在建立的所有15个电磁（EM）剖面中，不同幅度的明显裂缝仅出现在两个剖面中。与适当的地电断面的对比关系表明，该地区花岗岩/花岗岩-片麻片岩基岩中EM划定的基岩裂缝周围的电阻率参数表明，该基岩未发生明显分解或破裂以容纳大量地下水。这些位置上明显的电磁异常显然归因于相当厚的未固结风化地幔。因此，该地区特别是中西部地区的风化覆盖层被认为是特定于地下水的地区。除了有关调查主要目标的结果外，该研究还证明了将水文地质，VLF-EM和测深数据综合应用定位硬岩地形中的地下水勘探特定区域时的可靠性。

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