Potential Groundwater Recharge Sites Mapping in a Typical Basement Terrain: a GIS Methodology Approach
Potential Groundwater Recharge Sites Mapping in a Typical Basement Terrain: a GIS Methodology Approach
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DOI：
10.1007/s41651-019-0028-z
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发表时间：
2019-02
影响因子：
4
通讯作者：
O. F. Olabode
中科院分区：
文献类型：
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作者：
O. F. Olabode
Akoko地区的人口和基础设施发展逐渐增加，其下面是典型的地下室地形的岩石，需要寻找潜在的地下水补给点，以满足未来水需求的挑战。地下水补给指标，如岩性，地形，地貌，线性密度，土壤，降雨量，排水密度，土地利用/土地覆被进行了这项研究。这些补给指标的重新分类栅格层是从所获得的数据集生成的。然后，根据Saaty的方法（Saaty Eur J Oper Res 48：9-26，1990），根据对研究区域的当地地质和水文地质的了解，对这些指标进行了描绘、加权和分类。这些指标被集成到一个地理信息系统的环境，以产生一个潜在的地下水补给图的Akoko地区。地下水潜在补给分为5类（较差、一般、中等、良好和非常好），其面积覆盖率分别为446.42 km 2（26%）、772.65 km 2（45%）、291.89 km 2（17%）、154.53 km 2（9%）和51.51 km 2（3%）。所生成的地下水补给图经现有钻孔记录验证，确定了地下水补给图绘制地区与地下含水层之间的关系。这些补给区的绘图有助于更好地了解Akoko地区地下水动态和适当的水资源管理，以达到预期目的，并可适用于任何几个地下室地形。
The area of Akoko with a progressively increasing population and infrastructural development, underlain by rocks typified of a basement terrain, was subjected to the search for potential groundwater recharge sites, to meet the challenge of water demand in the future. Groundwater recharge indicators such as lithology, topography, geomorphology, lineament density, soil, rainfall, drainage density, and land use/land cover were employed for this study. Reclassified raster layers of these recharge indicators were generated from the acquired datasets. These indicators were then delineated, weighted, and classified on the basis of understanding of the local geology and hydrogeology of the study area using Saaty’s approach (Saaty Eur J Oper Res 48:9–26, 1990). These indicators were integrated into a GIS environment to produce a potential groundwater recharge map for the Akoko area. Five classes of potential groundwater recharge (poor, fair, moderate, good, and very good, with the following area coverage of 446.42 km2(26%), 772.65 km2(45%), 291.89 km2(17%), 154.53 km2(9%), and 51.51 km2(3%), respectively, were delineated. The generated groundwater recharge map was validated with available borehole records that established a relationship between the groundwater recharge mapped areas and basement aquifers. The mapping of these recharge areas aided better understanding of the groundwater dynamics and proper water resource management for anticipated purposes in the Akoko area, and can be applied to any several basement terrains.