卡拉巴尔大学校园(尼日利亚东南部)的地电、水文地质和水化学调查:对地下水可持续开发的影响

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Aniekan Edet, Ebenezer A. Kudamnya, Azubuike S. Ekwere
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引用次数: 0

摘要

人口的快速增长和基础设施的发展引发了无计划的地下水开发,导致地下水对地下水的严重压力,在尼日利亚卡拉巴尔的卡拉巴尔大学(University of Calabar)有几个不成功的钻孔或现有的破坏。因此,该大学利用垂直电测深(VES)进行了一项综合水文地质研究,以划定和描述含水层,并评估供饮用和灌溉用途的地下水质量,此外还进行了演变和人类健康风险评估。结果显示两个含水单元。第一层由厚度为3.6 ~ 118.8 m、电阻率为540 ~ 3500 Ω m的中粗砂层组成;第二层由黏性中细砂层组成,电阻率为44 ~ 2200 Ω m、厚度为50 ~ α。VES和抽水试验的含水层参数显示,第一含水层的平均水力传导率(K)和透射率(T)分别为180 m/天和25,740 m2/天,第二含水层为180 m/天和21,384 m2/天。从区域上看,学校的地下水流向南部。水化学数据表明,所有物理参数、主要和次要离子、微量元素和稀土元素都在饮用和农业用途的最大可接受限度内。主要水化学相为Na+-Ca2+-Cl—SO42-、Mg2+-Ca2+- hco3—Cl-和Ca2+-Mg2+- hco3—Cl-,硅酸盐风化、离子交换和反向离子交换是控制地下水化学的主要过程。经口腔(饮用)和皮肤(沐浴)途径的水体健康风险表明,所有微量元素(Al、As、Cd、Co、cr、Cu、Fe、Mn、Ni、Pb、Zn)的危害商(HQs)和危害指数(HI)值均小于1。这表明这些元素不会通过饮用和洗澡对当地人造成任何不利风险,但儿童比成人更敏感。本研究将为今后大学及其周边地区地下水资源的可持续发展和管理提供指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geoelectrical, Hydrogeological and Hydrochemical Investigations of the University of Calabar Campus (SE Nigeria): Implications for sustainable groundwater development

The rapid increase in population and infrastructural development has triggered unplanned groundwater development leading to severe stress on groundwater couple with several unsuccessful boreholes or failure of existing in the University of Calabar, Calabar (Nigeria). Hence, an integrated hydrogeological study was undertaken in the university using vertical electrical sounding (VES), to delineate and characterise aquifers and assess the groundwater quality for drinking and irrigation uses, in addition to evolution and human health risk assessment. The results reveal two water bearing units. The first is composed of medium-coarse-gravelly sand with thickness and resistivity in the range 3.6–118.8 m and 540–3500 Ω m, while the second underlying the first aquifer is composed of clayey, fine-medium sand with resistivity and thickness values in the range 44–2200 Ω m and 50 - α. Aquifer parameters from VES and pumping tests showed average hydraulic conductivity (K) and transmissivity (T) of 180 m/day and 25,740 m2/day for the first aquifer and 180 m/day and 21,384 m2/day for the second aquifer. Regionally, the groundwater flow in the university occurs toward the south. Hydrochemical data show that all the physical parameters, major and minor ions, trace and rare earth elements are within the maximum acceptable limits for drinking and agricultural uses. The dominant hydrochemical facies are Na+-Ca2+-Cl--SO42-, Mg2+-Ca2+-HCO3--Cl- and Ca2+-Mg2+-HCO3--Cl- with silicate weathering, ion exchange and reverse ion exchange as the major processess controlling the groundwater chemistry. Health risk of water through oral (drinking) and dermal (bathing) pathways showed that values of hazard quotients (HQs) and hazard index (HI) of all the trace elements (Al, As, Cd, Co, cr, Cu, Fe, Mn, Ni, Pb, Zn) were less than one. This suggests that these elements does not pose any adverse risks to the local people through drinking and bathing, but children are more sensitive than adults. This study will serve as a guide for future sustainable development and management of groundwater resource in the university and its environs.

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来源期刊
Solid Earth Sciences
Solid Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.60
自引率
5.00%
发文量
20
审稿时长
103 days
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