Characterizing groundwater vulnerability in developing urban settings using DRASTIC-LuPa approach: A case study of Aba City, Nigeria

Dickson Ijioma Uche, Wendland Frank, Herd Rainer
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Abstract

The impact of certain unregulated land-use activities harms the quality of water resources and reduces the sufficiency of drinking water in many developing countries. This study aimed to capture the impact of such activities and evaluate the specific groundwater vulnerability using a modified DRASTIC approach. The DRASTIC-L u P a was proposed and implemented for Aba City, Nigeria by incorporating land-use and the impact of pumping layers to the “intrinsic” DRASTIC parameters. The results of the analysis revealed that the area classified as “low” was 15 and 79.1% as “medium” and 5.9% as “high” vulnerability classes for the DRASTIC. Whereas for the DRASTIC-L u P a model 3.2% for “low”, 54.3% for “medium”, 41.8% for “high” and 0.7% for “very high” were found. The transitions in the vulnerability classes of areas displaying “high” and “very high” found in the DRASTIC-L u P a model represent the impact of urban hotspots observed in the area. This result implies that groundwater protection measures should be implemented in the area designated with “low” and “medium” vulnerability classes and used for abstracting clean water for drinking purposes. The proposed model enhances the predictability and guarantees better transferability of the approach in urban settings with similar urban trends.
利用DRASTIC-LuPa方法分析发展中城市地下水脆弱性:以尼日利亚阿坝市为例
在许多发展中国家,某些不受管制的土地使用活动的影响损害了水资源的质量,减少了饮用水的充足性。本研究的目的是捕捉这些活动的影响,并利用改进的DRASTIC方法评价具体的地下水脆弱性。通过将土地利用和抽水层的影响纳入到“内在”DRASTIC参数中,在尼日利亚的Aba市提出并实施了DRASTIC- l u P。分析结果显示,被划分为“低”的区域占15%,被划分为“中等”和“高”漏洞的区域占79.1%和5.9%。而对于DRASTIC-L u P,发现3.2%的模型为“低”,54.3%为“中”,41.8%为“高”,0.7%为“非常高”。在DRASTIC-L u P a模型中发现的“高”和“非常高”脆弱性等级的转变代表了该地区观测到的城市热点的影响。该结果表明,应在“低”和“中”脆弱等级地区实施地下水保护措施,并用于抽取清洁水供饮用。所提出的模型提高了可预测性,并保证了该方法在具有类似城市趋势的城市环境中具有更好的可转移性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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