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首页> 外文期刊>Journal of Hydrology >Hydrogeological investigation for assessment of the sustainability of low-arsenic aquifers as a safe drinking water source in regions with high-arsenic groundwater in Matlab, southeastern Bangladesh
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Hydrogeological investigation for assessment of the sustainability of low-arsenic aquifers as a safe drinking water source in regions with high-arsenic groundwater in Matlab, southeastern Bangladesh

机译：水文地质调查，以评估孟加拉国东南部Matlab的高砷地下水地区低砷含水层作为安全饮用水源的可持续性

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Exploitation of groundwater from shallow, high prolific Holocene sedimentary aquifers has been a main element for achieving safe drinking water and food security in Bangladesh. However, the presence of elevated levels of geogenic arsenic (As) in these aquifers has undermined this success. Except for targeting safe aquifers through installations of tubewells to greater depth, no mitigation option has been successfully implemented on a larger scale. The objective of this study has been to characterise the hydrostratigraphy, groundwater flow patterns, the hydraulic properties to assess the vulnerability of low-arsenic aquifers at Matlab, in south-eastern Bangladesh, one of the worst arsenic-affected areas of the country. Groundwater modelling, conventional pumping test using multilevel piezometers, hydraulic head monitoring in piezometer nests, ~(14)C dating of groundwater and assessment of groundwater abstraction were used. A model comprising of three aquifers covering the top 250 m of the model domain showed the best fit for the calibration evaluation criteria. Irrigation wells in the Matlab area are mostly installed in clusters and account for most of the groundwater abstraction. Even though the hydraulic heads are affected locally by seasonal pumping, the aquifer system is fully recharged from the monsoonal replenishment. Groundwater simulations demonstrated the presence of deep regional flow systems with recharge areas in the eastern, hilly part of Bangladesh and shallow small local flow systems driven by local topography. Based on modelling results and ~(14)C groundwater data, it can be concluded that the natural local flow systems reach a depth of 30 m b.g.l. in the study area. A downward vertical gradient of roughly 0.01 down to 200 m b.g.l. was observed and reproduced by calibrated models. The vertical gradient is mainly the result of the aquifer system and properties rather than abstraction rate, which is too limited at depth to make an imprint. Although irrigation wells substantially change local flow pattern, targeting low-As aquifers seems to be a suitable mitigation option for providing people with safe drinking water. However, installing additional irrigation- or high capacity production wells at the same depth is strongly discouraged as these could substantially change the groundwater flow pattern. The results from the present study and other similar studies can further contribute to develop a rational management and mitigation policy for the future use of the groundwater resources for drinking water supplies. Keywords: Bangladesh; Arsenic; Groundwater; Flow-modelling; Drinking water source; Hydrogeology
机译：在孟加拉国，浅层高产全新世沉积含水层的地下水开采已成为实现安全饮用水和粮食安全的主要因素。但是，这些含水层中高水平的地质砷（As）的存在破坏了这一成功。除了通过将管井安装到更大深度来锁定安全含水层外，还没有成功实施大规模的缓解措施。这项研究的目的是表征水文地层，地下水流型，水力特性，以评估孟加拉国东南部马特普拉（Matlab）低砷含水层的脆弱性，该国是该国受砷影响最严重的地区之一。使用了地下水建模，使用多级压差计的常规抽水测试，压差计巢内的水头监测，地下水的〜（14）C年代测定和地下水抽取评估。由覆盖模型域顶部250 m的三个含水层组成的模型显示出最适合校准评估标准。 Matlab地区的灌溉井大部分安装在集群中，占地下水抽取的大部分。即使季节性的抽水对液压头造成了局部影响，含水层系统也已从季风补给中完全充满。地下水模拟表明，在孟加拉国东部，丘陵地带有补给区的深层区域流动系统，以及由当地地形驱动的浅层小型局部流动系统。根据模拟结果和〜（14）C地下水数据，可以得出结论，自然局部流动系统的深度达到30 mb.g.l。在研究区域。向下的垂直梯度大约为0.01至200 mb.g.l。观察并通过校准模型进行复制。垂直梯度主要是含水层系统和性质的结果，而不是提取率，提取率在深度上太受限制而无法形成印迹。尽管灌溉井大大改变了当地的水流模式，但针对低砷含水层似乎是向人们提供安全饮用水的合适缓解方法。但是，强烈建议不要在相同深度安装更多的灌溉井或高产能的生产井，因为这些井会大大改变地下水的流向。本研究和其他类似研究的结果可进一步有助于制定合理的管理和缓解政策，以供将来将地下水资源用于饮用水供应。关键词：孟加拉国;砷;地下水;流程建模;饮用水源;水文地质

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