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首页> 外文期刊>Proceedings of the International Association of Hydrological Sciences >Spatio-temporal variations of hydrochemical and isotopic patterns of groundwater in hand-dug wells: the Cuvelai-Etosha Basin, Namibia
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Spatio-temporal variations of hydrochemical and isotopic patterns of groundwater in hand-dug wells: the Cuvelai-Etosha Basin, Namibia

机译：手工挖井中地下水的水化学和同位素模式的时空变化：纳米比亚库维莱-埃托沙盆地

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摘要

The rural population in parts of the Cuvelai-Etosha Basin (CEB) in Namibia depends on groundwater as a source for drinking and livestock watering. The aim of this study is to investigate spatial-temporal patterns for understanding water origins and recharge processes of perched aquifers in the CEB. The study uses hydrochemical data and water stable isotope signatures ( sup18/sup O and sup2/sup H) of samples collected during (10) ten field campaigns over a three-year period (from 2014 to 2016) originating from two regions within the basin (Ohangwena and Omusati). A clear distinction between the shallow groundwater in the Omusati and Ohangwena regions documented by TDS values, hydrochemical water types as well as the isotopic compositions of water. These differences are influenced mainly by their location in the landscape, depth to water table, the type of well infrastructure and aquifer material. Spatial and temporal variations indicate that even though these perched aquifers are both within the same basin, they are chemically different because of the rock materials in which their flow. Therefore, these differences in the water hydrochemical composition as well as the processes governing perched aquifers must be taken into account when planning groundwater management in the basin.
机译：纳米比亚Cuvelai-Etosha盆地（CEB）部分地区的农村人口依靠地下水作为饮用水和牲畜浇水。这项研究的目的是调查时空格局，以了解CEB栖息的含水层的水源和补给过程。该研究使用在三年（2014年以来）的十次野战中收集的样品的水化学数据和水稳定同位素特征（ 18 O和 2 H）至2016年）来自盆地内的两个地区（Ohangwena和Omusati）。通过TDS值，水化学水类型以及水的同位素组成，可以清楚地区分Omusati和Ohangwena地区的浅层地下水。这些差异主要受其在景观中的位置，地下水位的深度，井基础设施的类型和含水层材料的影响。时空变化表明，即使这些栖息的含水层都在同一个盆地内，但由于其流动的岩石材料，它们在化学上也有所不同。因此，在规划流域的地下水管理时，必须考虑到水中水化学成分的差异以及治理栖息含水层的过程。

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