• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>Heliyon >Origin and residence time of shallow groundwater resources in Lagos coastal basin south-west Nigeria: An isotopic approach
【2h】

Origin and residence time of shallow groundwater resources in Lagos coastal basin south-west Nigeria: An isotopic approach

机译：尼日利亚西南部拉各斯沿海盆地浅层地下水的起源和停留时间：同位素方法

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Knowledge of the source of water in the Lagos coastal basin (LCB) groundwater system was to be found vital to the future development and management of the system. Stable and radioactive isotopic measurements have been employed to unravel the source of recharge and residence time of the shallow groundwater system, based on the sampling conducted in 2016 and 2017 on groundwater, surface water and rainfall. The concentration of tritium in the groundwater samples were very low and ranged from less than 1 to 2.8 TU, while measured 14C contents ranged from 59.1 to 88 pMC. The δ18O values of groundwater samples ranged from 4.81 and 3.98 ‰, while the δ2H values ranged from -24.75 and -19.70 ‰ for the wet and dry seasons, respectively. The obtained results indicated non-existence of paleo recharge; rather all groundwater in the basin were found to be essentially of meteoric origin with intermittent surface water contributions. Moreover, shallow groundwater and surface water have considerable variations in isotopic compositions, reflecting evaporation and preservation of seasonal fluctuation. Though there was an observed generally low tritium content, however, it proved useful in the identification of recent active recharge taking place across the basin. The deduced radiocarbon age reflected the presence of “modern water” and thus supports the presence of present recharge to the groundwater system. Therefore, the source of the shallow groundwater recharge was actively renewable particularly during the wet season and thus water exploitation is potentially sustainable in the basin.
机译：人们发现，对拉各斯沿海盆地（LCB）地下水系统中水源的了解对于该系统的未来开发和管理至关重要。根据2016年和2017年对地下水，地表水和降雨进行的采样，已采用稳定的放射性同位素测量方法来揭示浅层地下水系统的补给源和停留时间。地下水样品中的ium浓度非常低，范围小于1至2.8 TU，而测得的 14 C含量范围为59.1至88 pMC。在干湿季，地下水样品的δ 18 O值分别为4.81和3.98‰，而δ 2 H值则为-24.75和-19.70‰。分别。所得结果表明不存在古土壤补给。而是发现流域中的所有地下水基本上都是陨石来源的，具有间歇性地表水贡献。此外，浅层地下水和地表水的同位素组成也有很大差异，反映出蒸发和保留了季节性波动。尽管观察到的generally含量普遍较低，但事实证明，它可用于识别整个盆地最近发生的活跃补给。推断的放射性碳年龄反映了“现代水”的存在，因此支持了目前向地下水系统补给的存在。因此，特别是在雨季期间，浅层地下水补给的源头可以积极地再生，因此该盆地的水开采潜力可持续。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号