期刊
JOURNAL OF HYDROLOGY
卷 539, 期 -, 页码 674-686出版社
ELSEVIER
DOI: 10.1016/j.jhydrol.2016.05.035
关键词
Arsenic; Urban groundwater pumping; Deep aquifer; Regional hydrogeology; Asia; Delta
资金
- NIEHS Superfund Research Program [P42 ES010349]
- NSF [IIA 0968354, ONR - MURIN00014-11-1-0683]
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 (>150 m), 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 x 10(-4) to 3.7 x 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. (C) 2016 Elsevier B.V. All rights reserved.
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