Source, transport, and evolution of saline groundwater in a shallow Holocene aquifer on the tidal deltaplain of southwest Bangladesh
Source, transport, and evolution of saline groundwater in a shallow Holocene aquifer on the tidal deltaplain of southwest Bangladesh
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DOI：
10.1002/2014wr016262
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发表时间：
2015-07
影响因子：
5.4
通讯作者：
S. Worland;G. Hornberger;S. Goodbred
中科院分区：
文献类型：
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作者：
S. Worland;G. Hornberger;S. Goodbred
三角洲地下水资源往往容易因海水入侵或与咸水古水体相互作用而退化。位于孟加拉国和印度西孟加拉邦的恒河-布拉马普特拉河-梅克纳河三角洲是一个特别脆弱的地区，估计有2000万沿海居民直接受到含盐饮用水的影响。沿海地区的浅层地下水主要是半咸淡水，其中含有少量淡水。为了探索浅层含水层中水盐度分布的可能的水文地质解释，对堤岸潮汐海峡岛地下的地下水盐度进行了小规模的水文调查。本研究采用3H和14C测年、电磁地下测绘和二维溶质输运模型相结合的方法。作者得出结论，浅层地下水盐度最好的解释是，在全新世早期至中期沉积的古咸淡水中，大气水的缓慢渗透。
Deltaic groundwater resources are often vulnerable to degradation from seawater intrusion or through interaction with saline paleowaters. The Ganges‐Brahmaputra‐Meghna River delta, in Bangladesh and West Bengal, India, is a particularly vulnerable area with an estimated 20 million coastal inhabitants directly affected by saline drinking water. The shallow groundwater of the coastal regions is primarily brackish with pockets of fresher water. A small‐scale hydrologic investigation of groundwater salinity beneath an embanked tidal channel island was undertaken to explore possible hydrogeological explanations of the distribution of water salinities in the shallow aquifer. This study employs a combination of 3H and 14C dating, electromagnetic subsurface mapping, and a 2‐D solute transport model. The authors conclude that the shallow groundwater salinity can best be explained by the slow infiltration of meteoric water into paleo‐brackish estuarine water that was deposited during the early‐mid Holocene.