Hydrogeological Properties of the Rocks in Adansi Mining Area, Ghana

A. Asante-annor, A. Ewusi
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引用次数: 1

Abstract

Groundwater is an important resource in the Adansi mining area as some communities in the area are not connected to the Ghana national water network. These communities therefore utilise groundwater for potable water supply. The hydrogeological properties of an aquifer coupled with climatic conditions and geomorphology determines how much groundwater exists in that location. A hydrogeological study of the rocks in the Adansi area was carried out to obtain the aquifer hydraulic properties. Drilling and pumping test analysis information were used to assess these properties. The average borehole depth in the area was 44.3 m whilst the average static water level is 10.75 m. There is a general decrease in yield with an increase in borehole total depth. There is also no strong correlation between aquifer saturated thickness, yield and drawdown. Transmissivity of the aquifer decreases from the phyllite, argillitc sediments, granites to sandstone. Three hydrogeological regimes (> 0.9 m/day, 0.9 – 0.09 m/day and < 0.09 m/day) were also realised based on the hydraulic conductivity. The spatial distribution of the hydraulic properties suggests the influence of geological structures on the occurrence of groundwater in the area. Keywords : Hydrogeological Properties, Mining, Hydraulic, Drilling, Groundwater
加纳Adansi矿区岩石水文地质性质
地下水是Adansi矿区的重要资源,因为该地区的一些社区没有连接到加纳国家水网。因此,这些社区利用地下水作为饮用水供应。含水层的水文地质特性与气候条件和地貌相结合,决定了该地点存在多少地下水。对阿丹寺地区的岩石进行了水文地质研究,获得了含水层的水力特性。钻井和泵送测试分析信息用于评估这些属性。该区平均钻孔深度为44.3 m,平均静水位为10.75 m。随着井眼总深度的增加,产量普遍下降。含水层饱和厚度、含水率和含水率之间也没有很强的相关性。含水层透过率由千层岩、泥质沉积、花岗岩到砂岩依次递减。基于水力导率,还实现了三种水文地质状态(> 0.9 m/day, 0.9 - 0.09 m/day和< 0.09 m/day)。水力学性质的空间分布反映了地质构造对区内地下水赋存的影响。关键词:水文地质性质,采矿,水力,钻井,地下水
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