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首页> 外文期刊>Journal of applied sciences and environmental management >Investigating the causes of water-well failure in the Gaotlhobogwe wellfield in southeast Botswana
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Investigating the causes of water-well failure in the Gaotlhobogwe wellfield in southeast Botswana

机译：博茨瓦纳东南部高特霍博格威井场水井衰竭原因调查

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In the management of groundwater resources, identifying determinants of borehole failure is useful in planning borehole and wellfield remedial measures as well identifying appropriate water treatment mechanisms if deteriorating water quality prevails as a result of decline of borehole yield and water level. A continually declining well yield in the Gaotlhobogwe wellfield, in south eastern Botswana, triggered this investigation. The determinants of groundwater level decline, which reaches about 80% in the wellfield were identified and their contribution assessed through multivariate analysis. Even though there is a 50% of decline in the specific capacity of pumping wells within 8 years period from 1995- 2003, another 30% of the decline was found to be attributed to chemical determinants, namely as Mn, Mg, Fe NO_3, HCO_3, CO_3 and SO_4 The potential physical determinants are found to be pH, EC and TDS. The geological and hydro-geological evidence of the possible causes of groundwater decline and the identified determinants is discussed in relation to borehole construction and completion guidelines for contractors and drillers.
机译：在地下水资源管理中，如果井眼产量和水位下降导致水质恶化，那么确定井眼故障的决定因素将有助于规划井眼和井场补救措施，以及确定适当的水处理机制。博茨瓦纳东南部的高特霍博格威井场的井产量持续下降，引发了这一调查。确定了地下水位下降的决定因素，该因素在井场达到了约80％，并通过多变量分析评估了其贡献。即使从1995年至2003年的8年内，抽水井的比容下降了50％，但发现另外30％的下降归因于化学决定因素，即Mn，Mg，Fe NO_3，HCO_3 ，CO_3和SO_4发现潜在的物理决定因素是pH，EC和TDS。讨论了有关地下水下降的可能原因的地质和水文地质证据以及已确定的决定因素，并与承包商和钻探人员的钻孔施工和完井指南相关。

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