评估高度人类活动地区的地下水质量和溶质来源。尼日利亚阿布贾联邦首都地区案例

IF 4.9 Q2 ENGINEERING, ENVIRONMENTAL

Groundwater for Sustainable Development Pub Date : 2025-02-19 DOI:10.1016/j.gsd.2025.101425

M. Etuk , V. Re , S. Viaroli , B. Raco , O. Igwe

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引用次数: 0

摘要

阿布贾联邦首都地区是一个严重人为化的含水层的例子，在那里，自然的水岩相互作用过程被人类污染所掩盖。因此，自然过程的表征特别困难，特别是将自然特征与人为特征区分开来。利用综合地球化学、统计和同位素方法，在2021年和2022年的雨季和旱季进行了两次调查。结果表明，地下水样品受Ca-HCO3相水（与天然水-岩相互作用过程有关）与污染水混合过程的影响。后者可以在雨季转向no3优势相的一些井中观察到。水分子的稳定同位素（δ18O和δ2H）表明存在多个补给带和强烈的季节变化。地下水同位素组成的变化表明雨季的二次蒸发和旱季局地降水的影响有限，深层含水层的贡献可能占主导地位。2021年氚（3H）的频率分布证实了干旱季节当地降水的影响有限（中位数为0.8 TU），进一步支持了深层含水层对地下水流动的主导作用。观察到雨水入渗的影响是对储存在不饱和带的污染物（农业和家庭来源）的再活化的主要贡献，而不是稀释效应。这导致雨季NO3−浓度逐渐增加（达到433 mg/L），强调需要更完整的特征，以支持在受人为压力增加和人口显著增长倾向的地区进行更明智的可持续环境管理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Assessing groundwater quality and solute sources in highly anthropized areas. The case of Abuja Federal Capital Territory, Nigeria

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Assessing groundwater quality and solute sources in highly anthropized areas. The case of Abuja Federal Capital Territory, Nigeria

The Abuja Federal Capital Territory is an example of a heavily anthropized aquifer, where natural water-rock interaction processes are masked by human pollution. As a result, the characterization of natural processes is particularly difficult, especially to disentangle the natural from the anthropogenic signature. Two surveys were conducted in the rainy and dry season in 2021 and 2022 using an integrated geochemical, statistical, and isotopic approach. Results show that groundwater samples are affected by mixing processes between water with a Ca-HCO₃ facies (associated to natural water-rock interaction processes) and contaminated waters. The latter can be observed in some wells with a shift to NO₃-dominant facies in the rainy season. The stable isotopes of the water molecule (δ¹⁸O and δ²H) suggest the presence of multiple recharge zones and strong seasonal variability. The shifts in groundwater isotopic composition suggest secondary evaporation in the rainy season and limited local precipitation influence during the dry season, with a possible domination of deep aquifer contributions.

The frequency distribution of tritium (³H) in 2021 confirms the limited impact of local precipitation during the dry season (median 0.8 TU), further supporting the dominance of deep aquifer contributions to groundwater flow. The influence of rainwater infiltration is observed as a main contribution to the remobilization of contaminants (of agricultural and domestic origin) stocked in the unsaturated zone, rather than a dilution effect. This results in a progressive increase of NO₃⁻ concentration in the rainy season (reaching 433 mg/L), highlighting the need for a more complete characterization to support a wiser sustainable environmental management in an area subject to increasing anthropogenic pressure and prone to significant population growth.

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来源期刊

Groundwater for Sustainable Development Social Sciences-Geography, Planning and Development

CiteScore

11.50

自引率

10.20%

发文量

152

期刊介绍： Groundwater for Sustainable Development is directed to different stakeholders and professionals, including government and non-governmental organizations, international funding agencies, universities, public water institutions, public health and other public/private sector professionals, and other relevant institutions. It is aimed at professionals, academics and students in the fields of disciplines such as: groundwater and its connection to surface hydrology and environment, soil sciences, engineering, ecology, microbiology, atmospheric sciences, analytical chemistry, hydro-engineering, water technology, environmental ethics, economics, public health, policy, as well as social sciences, legal disciplines, or any other area connected with water issues. The objectives of this journal are to facilitate: • The improvement of effective and sustainable management of water resources across the globe. • The improvement of human access to groundwater resources in adequate quantity and good quality. • The meeting of the increasing demand for drinking and irrigation water needed for food security to contribute to a social and economically sound human development. • The creation of a global inter- and multidisciplinary platform and forum to improve our understanding of groundwater resources and to advocate their effective and sustainable management and protection against contamination. • Interdisciplinary information exchange and to stimulate scientific research in the fields of groundwater related sciences and social and health sciences required to achieve the United Nations Millennium Development Goals for sustainable development.