VULNERABILITY OF LOW-ARSENIC AQUIFERS TO MUNICIPAL PUMPING IN BANGLADESH.
VULNERABILITY OF LOW-ARSENIC AQUIFERS TO MUNICIPAL PUMPING IN BANGLADESH.
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DOI：
10.1016/j.jhydrol.2016.05.035
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发表时间：
2016-08
影响因子：
6.4
通讯作者：
van Geen A
中科院分区：
文献类型：
--
作者：
Knappett PSK;Mailloux BJ;Choudhury I;Khan MR;Michael HA;Barua S;Mondal DR;Steckler MS;Akhter SH;Ahmed KM;Bostick B;Harvey CF;Shamsudduha M;Shuai P;Mihajlov I;Mozumder R;van Geen A
超过 12,000 年前沉积的沙质含水层（有些浅至 30 m）为孟加拉国农村地区提供了可靠的低砷 (As) 饮用水供应。这项研究涉及达卡市周边地区这些含水层污染的潜在风险，由于市政抽水，超过 150 m 深的含水层的水头在几十年内下降了 70 m。 2012 年至 2014 年对 12 个深水井（>150 m）、3 个中水井（90-150 m）和 6 个浅水井（< 90 m）、1 个私人浅水井和 1 个河流测压计连续测量的水位显示，所产生的水位下降锥体向达卡以东延伸了 15-35 公里。距离达卡最近的 62-147 m 深度范围内的 4 个低砷社区水井在一年中多达三分之一的时间无法通过抽吸达到水位。深层含水层系统的横向水力梯度范围为 1.7×10−4 至 3.7×10−4，表明 2012-2014 年流向达卡。水位下降锥边缘的垂直补给量估计为 0.21±0.06 m/年。数据表明，达卡持续的市政抽水最终可能会污染一些相对较浅的社区水井。
Sandy aquifers deposited >12,000 years ago, some as shallow as 30 m, have provided a reliable supply of low-arsenic (As) drinking water in rural Bangladesh. This study concerns the potential risk of contaminating these aquifers in areas surrounding the city of Dhaka where hydraulic heads in aquifers >150 m deep have dropped by 70 m in a few decades due to municipal pumping. Water levels measured continuously from 2012 to 2014 in 12 deep (>150m), 3 intermediate (90–150 m) and 6 shallow (<90 m) community wells, 1 shallow private well, and 1 river piezometer show that the resulting drawdown cone extends 15–35 km east of Dhaka. Water levels in 4 low-As community wells within the 62–147 m depth range closest to Dhaka were inaccessible by suction for up to a third of the year. Lateral hydraulic gradients in the deep aquifer system ranged from 1.7×10−4 to 3.7×10−4 indicating flow towards Dhaka throughout 2012–2014. Vertical recharge on the edge of the drawdown cone was estimated at 0.21±0.06 m/yr. The data suggest that continued municipal pumping in Dhaka could eventually contaminate some relatively shallow community wells.
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