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首页> 外文期刊>International Journal of Geosciences >Geoelectrical Investigation of a Proposed Dam Site in a Sedimentary Terrain: Case Study of Aba River at Amapu-Ideobia, Akanu Ngwa Southeastern Nigeria
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Geoelectrical Investigation of a Proposed Dam Site in a Sedimentary Terrain: Case Study of Aba River at Amapu-Ideobia, Akanu Ngwa Southeastern Nigeria

机译：沉积地形中拟建坝址的地电调查：以尼日利亚东南部阿卡努-恩格瓦阿马普-伊德比亚的阿坝河为例

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The geoelectrical investigation of the proposed Aba River dam at Amapu-Ideobia, Akanu Ngwa Southeastern Nigeria has been carried out. The objective of this study is to determine the downward and lateral trends of the rock layers or units along and near the proposed dam axis and deduce the possible structures that may enhance workable design of the dam. ABEM Terrameter SAS 4000 model was used and the symmetrical Schlumberger configuration was adopted. Twelve (12) Vertical Electrical Sounding stations were located and fully occupied along the dam axis. Preliminary input data from the field were fed into Zohdy software to generate real resistivities and depths to geoelectric layers. Five geoelectric layers were interpreted as Loamy Top soil, Alluvial matter, Pebble bed, Sandy lateritic and Gravely sand. Layer 1 (the top loamy soil) was encountered in VES 1, 2, 3, 4, 5, 9, 10, 11 and 12 locations with maximum thickness of 1.5 m in VES 3 and 4. Resistivity values ranged from 216 to 519 Ohm-m. The second layer (lateritic matter) had a maximum lower depth of 5 m in VES 3 and 4 points. This was not encountered in VES 6 point being replaced by alluvium. Resistivity values ranged from 101 to 6190 Ohm-m. Layer 3 was interpreted as a restricted pebble bed which occurred only at VES 6, 7 and 8 locations flanking the river course with thickness of about 3.5 m and resistivity values range of 182 415 Ohm-m. The fourth layer was modeled as the alluvial matter and restricted to the river course (VES 6, 7, 8) locations with base at between 12.5 m in VES 8 and 8 m in VES 6. The last modeled layer (Layer 5) was composed of gravely sandstone that underlined the whole study area apart from the restricted pebble bed at the NE crestal portion (VES 12). No structures like fractures, lineaments and faults that would be of deleterious effect were observed in all the VES points down to about 40 m. However, it was observed that the axial length had overriding sandy matter with high porosity and potentially rife for great infiltration; a condition that could facilitate seepage around the reservoir portion of the dam.
机译：已对尼日利亚东南部阿卡努-恩格瓦阿马普-伊德比亚的拟建阿坝河大坝进行了地电调查。这项研究的目的是确定沿着和靠近拟建的大坝轴线的岩石层或单元的向下和横向趋势，并推论出可能增强大坝可行设计的结构。使用ABEM Terrameter SAS 4000模型，并采用对称的Schlumberger配置。安置了十二（12）个垂直电测深站，并沿水坝轴线完全占据。来自该领域的初步输入数据被输入到Zohdy软件中，以生成对地电层的真实电阻率和深度。五个地电层被解释为沃土表层土壤，冲积物，卵石床，桑迪红土和严重砂土。在VES 1、2、3、4、5、9、10、11和12的位置遇到了第1层（顶部的壤土），在VES 3和4中的最大厚度为1.5 m。电阻率值的范围为216至519欧姆-米第二层（红土物质）在VES 3和4点中的最大下深度为5 m。在被冲积层替代的VES 6点中没有遇到这种情况。电阻率范围为101至6190 Ohm-m。第3层被解释为限制性卵石床，仅在河道两侧的VES 6、7和8位置出现，厚度约3.5 m，电阻率范围为182 415 Ohm-m。第四层被建模为冲积物，并限制在河道（VES 6、7、8）位置，其底部在VES 8中为12.5 m，在VES 6中为8 m。最后一个建模层（第5层）组成严重的砂岩，除了NE顶部（VES 12）受限制的卵石床外，突出了整个研究区域。在低至约40 m的所有VES点中均未观察到可能具有有害作用的结构，例如裂缝，衬里和断层。然而，据观察，轴向长度覆盖着具有高孔隙率的砂质，并且可能大量渗透。可能促进大坝水库部分渗漏的条件。

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