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Evaluation of groundwater quality for drinking and irrigation purposes using GIS-based water quality index in urban area of Abaya-Chemo sub-basin of Great Rift Valley, Ethiopia
Applied Water Science ( IF 5.7 ) Pub Date : 2021-08-13 , DOI: 10.1007/s13201-021-01482-6
Tamru Tesseme Aragaw 1 , Gopalakrishnan Gnanachandrasamy 2, 3
Affiliation  

Groundwater is the major resource for drinking and irrigation purposes in urban areas of Abaya-Chemo sub-basin of Great Rift Valley, Ethiopia. There is an incredible increase in demand in the sub-basin for good-quality groundwater resources. However, the exhaustive irrigation and rapid urbanization has posed a serious threat to groundwater quality in the urban districts of sub-basin like Arba Minch town. The aim of the study was to evaluate the groundwater quality status and to map their spatial distribution with respect to the suitability for drinking and irrigation purposes in Arba Minch town, Ethiopia. Fourteen bore well samples were examined for geochemical variations and groundwater qualities. The spatial distribution maps of quality parameters were prepared using the kriging method in ArcGIS 10.3. Drinking water quality index, sodium adsorption ratio (SAR), percentage sodium (Na%), residual sodium carbonate (RSC), and permeability index (PI) were considered for drinking and irrigation suitability assessment. Comparison of the hydrochemical results with the World Health Organization (WHO) and Ethiopian drinking water standards (ES) and various classifications revealed that the current status of the groundwaters is suitable for drinking and irrigation purposes except for a few sites at the northwestern part of the study area. The WQI results revealed that 7% and 64% of samples fall from excellent to good classes for drinking categories. Irrigation indices also demonstrated that 80% of samples fall in good classes for irrigation purposes. About 75 percent of samples belong to Ca–Mg-HCO3 facies, and the reaming samples belong to Ca–Mg–Cl facies. The results of the study concluded that the proposed approach is reliable and efficient for the groundwater pollution status evaluation and can also be applied in decision making for effective groundwater resources monitoring in the study area.



中文翻译:

使用基于GIS的水质指数评估埃塞俄比亚大裂谷阿巴亚-切莫子流域市区用于饮用和灌溉的地下水质量

地下水是埃塞俄比亚东非大裂谷阿巴亚-切莫子盆地城市地区饮用和灌溉的主要资源。子流域对优质地下水资源的需求出现了惊人的增长。然而,在阿尔巴明奇镇等子流域城区,无序灌溉和快速城市化对地下水质量构成了严重威胁。该研究的目的是评估地下水质量状况,并根据埃塞俄比亚 Arba Minch 镇饮用水和灌溉目的的适宜性绘制其空间分布图。检查了 14 个钻孔样品的地球化学变化和地下水质量。质量参数的空间分布图使用ArcGIS 10.3 中的克里金法制作。饮用水水质指标 钠吸附率 (SAR)、钠百分比 (Na%)、残留碳酸钠 (RSC) 和渗透指数 (PI) 被考虑用于饮用水和灌溉适宜性评估。将水化学结果与世界卫生组织 (WHO) 和埃塞俄比亚饮用水标准 (ES) 和各种分类的比较表明,地下水的现状除了西北部的少数地点外,都适合饮用和灌溉。研究区。WQI 结果显示,7% 和 64% 的样本在饮酒类别中从优秀到良好。灌溉指数还表明,80% 的样本属于灌溉目的的良好类别。大约 75% 的样品属于 Ca-Mg-HCO 和渗透指数 (PI) 被考虑用于饮用水和灌溉适宜性评估。将水化学结果与世界卫生组织 (WHO) 和埃塞俄比亚饮用水标准 (ES) 和各种分类的比较表明,地下水的现状除了西北部的少数地点外,都适合饮用和灌溉。研究区。WQI 结果显示,7% 和 64% 的样本在饮酒类别中从优秀到良好。灌溉指数还表明,80% 的样本属于灌溉目的的良好类别。大约 75% 的样品属于 Ca-Mg-HCO 和渗透指数 (PI) 被考虑用于饮用水和灌溉适宜性评估。将水化学结果与世界卫生组织 (WHO) 和埃塞俄比亚饮用水标准 (ES) 和各种分类的比较表明,地下水的现状除了西北部的少数地点外,都适合饮用和灌溉。研究区。WQI 结果显示,7% 和 64% 的样本在饮酒类别中从优秀到良好。灌溉指数还表明,80% 的样本属于灌溉目的的良好类别。大约 75% 的样品属于 Ca-Mg-HCO 将水化学结果与世界卫生组织 (WHO) 和埃塞俄比亚饮用水标准 (ES) 和各种分类的比较表明,地下水的现状除了西北部的少数地点外,都适合饮用和灌溉。研究区。WQI 结果显示,7% 和 64% 的样本在饮酒类别中从优秀到良好。灌溉指数还表明,80% 的样本属于灌溉目的的良好类别。大约 75% 的样品属于 Ca-Mg-HCO 将水化学结果与世界卫生组织 (WHO) 和埃塞俄比亚饮用水标准 (ES) 和各种分类的比较表明,地下水的现状除了西北部的少数地点外,都适合饮用和灌溉。研究区。WQI 结果显示,7% 和 64% 的样本在饮酒类别中从优秀到良好。灌溉指数还表明,80% 的样本属于灌溉目的的良好类别。大约 75% 的样品属于 Ca-Mg-HCO WQI 结果显示,7% 和 64% 的样本在饮酒类别中从优秀到良好。灌溉指数还表明,80% 的样本属于灌溉目的的良好类别。大约 75% 的样品属于 Ca-Mg-HCO WQI 结果显示,7% 和 64% 的样本在饮酒类别中从优秀到良好。灌溉指数还表明,80% 的样本属于灌溉目的的良好类别。大约 75% 的样品属于 Ca-Mg-HCO3相,扩孔样品属于 Ca-Mg-Cl 相。研究结果表明,所提出的方法对于地下水污染状况评价是可靠和有效的,也可用于研究区有效地下水资源监测的决策。

更新日期:2021-08-19
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