Effect of groundwater flow on forming arsenic contaminated groundwater in Sonargaon, Bangladesh

JOURNAL OF HYDROLOGY

卷:409

Article

Nakaya, Shinji¹  Natsume, Haruyasu¹  Masuda, Harue²  Mitamura, Muneki²  Biswas, Dipak Kumar³  Seddique, Ashraf A.⁴ 

[1] Shinshu Univ, Dept Civil Engn, Nagano, Japan

[2] Osaka City Univ, Dept Geosci, Osaka 558, Japan

[3] Asian Arsen Network, Jessore, Bangladesh

[4] Jessore Sci & Technol Univ, Dept Petr & Min Engn, Jessore Sadar, Bangladesh

关键词: Arsenic;    Groundwater;    Flow path;    Contamination;    Bangladesh;    Hotspots;   

DOI  :  10.1016/j.jhydrol.2011.09.006

来源: Elsevier

【 摘 要 】

Three-dimensional groundwater flow in Sonargaon, Bangladesh is numerically simulated in order to evaluate the flow paths of As-contaminated drinking groundwater in the Holocene aquifer of the Ganges-Blamaptra-Meghna delta plain over a recent 30-year period. The model indicates that vertical infiltration of surface groundwater into the shallow Holocene aquifer occurs frequently in the Ganges-Blamaptra-Meghna delta plain. It predicts that the water recharged from ground surface moves approximately 10-20 m vertically downward beneath the flood plain, with a gradually increasing horizontal flow, toward the underlying Pleistocene middle mud layer (aquitard). The model also predicts that groundwaters containing highest As concentrations (>700 mu g/L) are formed on the vertical groundwater flow paths where surface water recharges the Holocene aquifer and not on the horizontal flow paths. Combining with the groundwater chemistry, reducing groundwater condition is not essential for the As-contaminated groundwater of the studied area in the Ganges delta plain. (C) 2011 Elsevier B.V. All rights reserved.

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