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首页> 外文会议>Symposium on Water Resources Systems - Water Availability and Global Change; Jun 30-Jul 11, 2003; Sapporo, Japan >Groundwater pollution vulnerability and groundwater protection strategy for the Owerri area, southeastern Nigeria
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Groundwater pollution vulnerability and groundwater protection strategy for the Owerri area, southeastern Nigeria

机译：尼日利亚东南部Owerri地区的地下水污染脆弱性和地下水保护策略

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The vulnerability to pollution of the Owerri regional water supply in, Nigeria, was assessed as the basis for proposing an appropriate strategy for protecting the groundwater resources. The vulnerability assessment was accomplished using the LeGrand, GOD, SIGA, and DRASTIC computer models. The model techniques generally involve parameter rating and point-count systems, based on evaluation of various hydrogeological parameters in relation to their capacity to influence the flow of contaminants in the groundwater system. The Owerri area is generally flat and groundwater recharge is relatively high. The area is underlain by predominantly sandy strata in the north, which grade into gravelly sequences towards the southwest. The southeastern part of the area is underlain in part by a thick clayey faces that thins and interfingers into the gravelly strata. Effective hydraulic conductivity ranges from 5.6 x 10~(-9) to 1.44 x 10~(-3) m s~(-1), the higher value being in the coarse sand and gravel units. The depth to the water table is about 60 m in the north decreasing southward to less than 20 m; the hydraulic-head gradient is 9-22%. The southwestern part of the Owerri area including the Owerri conurbation has a high vulnerability to groundwater pollution and therefore waste disposal sites should not be located there. The northern and southeastern areas have moderate and low vulnerabilities, respectively, and carefully selected and engineered sites within those areas could be considered for future waste disposal. Policies should be instituted to facilitate the closing of pollution sources in the area of high vulnerability such as open disposal pits, leaking petrol stations, effluent discharge from industries, and use of pit latrines, and to locate future disposal site in areas of lower vulnerability.
机译：尼日利亚Owerri地区供水的污染脆弱性被评估为提出保护地下水资源的适当战略的基础。漏洞评估是使用LeGrand，GOD，SIGA和DRASTIC计算机模型完成的。基于对各种水文地质参数影响地下水系统污染物流量的能力的评估，模型技术通常涉及参数评估和点计数系统。 Owerri地区通常是平坦的，地下水补给量相对较高。该地区的北部主要是砂质地层，向西南逐渐形成砾石层。该地区的东南部分被厚厚的粘土表面所覆盖，该表面变薄并相互干涉进入砾石地层。有效水力传导率范围为5.6 x 10〜（-9）至1.44 x 10〜（-3）m s〜（-1），较高的值是在粗砂和砾石单元中。北部的地下水位深度约为60 m，向南减少至20 m以下；液压头的坡度为9-22％。 Owerri地区的西南部分（包括Owerri市区）极易受到地下水污染的影响，因此不应在该处设置废物处理场。北部和东南部地区分别具有中等和较低的脆弱性，可以考虑在这些区域内精心选择和精心设计的地点用于将来的废物处理。应制定政策，以便利关闭高脆弱性地区的污染源，例如露天处置场，加油站泄漏，工业废水排放和使用坑厕，并在脆弱性较低的地区确定未来的处置场所。

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