孟加拉盆地冲积含水层中砷的补救潜力:模拟和时间估算的启示

Water Supply Pub Date : 2024-06-03 DOI:10.2166/ws.2024.128
Xinyi Chen
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引用次数: 0

摘要

在冲积含水层中发现了大量的砷。孟加拉国严重依赖孟加拉盆地的冲积含水层作为灌溉和饮用水的来源。由于地形平坦,含水层中的砷不易被冲出系统。此外,持续、无节制的抽水会导致砷从较深的含水层向较浅的含水层迁移。本研究结合使用 MODFLOW、MODPATH 和 MT3DMS,模拟了孟加拉盆地冲积含水层中的地下水和污染物迁移情况,比较了人类干预前不同海平面下的两种情况。模拟结果表明,在海平面相当低的时期,水力梯度和流速比现在要高。此外,在一个 100 米厚的受污染含水层中,全新世含水层需要 5,600 年,末次冰川期含水层需要 3,300 年才能将砷冲刷到孟加拉国饮用水标准浓度。这意味着,如果海平面随着气候变化继续上升,将很难通过自然冲刷清除孟加拉盆地冲积含水层中的砷,这意味着为了国家的健康,需要在该地区进行人工干预。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Remediation potential of arsenic in the alluvial aquifers in the Bengal Basin: insights from simulations and time estimates
Arsenic is found in significant quantities within the alluvial aquifers. Bangladesh heavily relies on the alluvial aquifers of the Bengal Basin as a source of irrigation and drinking water. Due to the flat topography, arsenic within an aquifer is not easily flushed out of the system. Additionally, continuous, unregulated pumping causes arsenic from deeper aquifers to migrate to shallower levels. This study simulates groundwater and contaminant transport in the alluvial aquifers of the Bengal Basin by comparison between two scenarios prior to human intervention with different sea levels, employing a combination of MODFLOW, MODPATH and MT3DMS. The simulations demonstrate that the hydraulic gradient and flow rates were higher during periods of considerably lower sea levels than they are at present. Additionally, it would require 5,600 years for the Holocene aquifer and 3,300 years for the Last Glacial Period aquifer to flush arsenic to the Bangladesh standard concentrations in drinking water in a 100-m-thick contaminated aquifer. This implies that if the sea level continues to rise with climate change, it will be difficult to remove arsenic from the alluvial aquifers in the Bengal Basin by natural flushing, which means artificial interventions need to be done in that region in the interest of the nation's health.
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