Delineation of preferential flow pathways in a tropical crystalline rock aquifer in Tarkwa, Ghana using integrated hydrogeophysical methods

IF 2.7 4区 环境科学与生态学 Q2 Environmental Science Hydrology Research Pub Date : 2023-04-29 DOI:10.2166/nh.2023.006
P. Agbotui, A. Ewusi, J. Seidu, Mark Brookman-Amissah., A. Woode, Bright Aforla
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Abstract

In Ghana, crystalline rock aquifers with secondary hydraulic features and preferential flow pathways serve as very important aquifers. Protecting and managing these geological porous media require identifying preferential flow pathways and hydraulic characteristics. In this study, preferential flow pathways and hydraulic parameters were characterised for two boreholes (Hilly and Valley) located in Tarkwa, Ghana via the integrated use of borehole dilution testing (BDT), slug testing, and geological mapping. The geological fieldwork mapped a relatively sparsely fractured Sandstone Unit overlying a heavily foliated and fissile Phyllite Unit. Geology influenced groundwater flow in boreholes. The BDT confirmed the geology by showing a stratified flow system with preferential flow pathways. The Hilly/recharge area borehole shows relatively low downward flow, whereas the Valley/transition area borehole is dominated by the concentrated diffuse horizontal flow. These flow patterns are in agreement with the borehole locations and their dominant geologies. The estimated hydraulic conductivity, transmissivity, and storage coefficient ranged between 5.1 × 10−4–7.7 × 10−2 m/d, 4.0 × 10−2–3.2 m2/d, and 10−7–10−5, respectively. The cheap integrated hydrogeophysical methods used in this study are applicable for characterising, protecting, and managing other crystalline aquifers in the West African sub-region and other tropical terrains.
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使用综合水文物理方法描绘加纳Tarkwa热带结晶岩含水层中的优先流动路径
在加纳,具有次要水力特征和优先流动路径的结晶岩含水层是非常重要的含水层。保护和管理这些地质多孔介质需要确定优先的流动路径和水力特征。在本研究中,通过综合使用钻孔稀释测试(BDT)、段塞测试和地质测绘,对位于加纳Tarkwa的两个钻孔(Hilly和Valley)的优先流动路径和水力参数进行了表征。地质实地调查绘制了一个相对稀疏的断裂砂岩单元,该单元覆盖着一个严重的叶理和易裂变的千枚岩单元。地质影响了钻孔中的地下水流量。BDT通过显示具有优先流动路径的分层流动系统来确认地质情况。丘陵/补给区钻孔显示出相对较低的向下流量,而山谷/过渡区钻孔则以集中的扩散水平流为主。这些流动模式与钻孔位置及其主要地质相一致。估计的导水率、透射率和蓄水系数分别在5.1×10−4–7.7×10−2 m/d、4.0×10−2-3.2 m2/d和10−7–10−5之间。本研究中使用的廉价综合水文物理方法适用于西非次区域和其他热带地形的其他结晶含水层的特征描述、保护和管理。
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来源期刊
Hydrology Research
Hydrology Research Environmental Science-Water Science and Technology
CiteScore
5.30
自引率
7.40%
发文量
70
审稿时长
17 weeks
期刊介绍: Hydrology Research provides international coverage on all aspects of hydrology in its widest sense, and welcomes the submission of papers from across the subject. While emphasis is placed on studies of the hydrological cycle, the Journal also covers the physics and chemistry of water. Hydrology Research is intended to be a link between basic hydrological research and the practical application of scientific results within the broad field of water management.
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