2024-03-29T10:09:09Z
https://soar-ir.repo.nii.ac.jp/oai
oai:soar-ir.repo.nii.ac.jp:00012390
2022-12-14T04:30:10Z
1221:1222
Effect of groundwater flow on forming arsenic contaminated groundwater in Sonargaon, Bangladesh
Nakaya, Shinji
Natsume, Haruyasu
Masuda, Harue
Mitamura, Muneki
Biswas, Dipak Kumar
Seddique, Ashraf A.
Arsenic
Groundwater
Flow path
Contamination
Bangladesh
Hotspots
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.
Article
JOURNAL OF HYDROLOGY. 409(3-4):724-736 (2011)
ELSEVIER SCIENCE BV
2011-11-09
eng
journal article
AM
http://hdl.handle.net/10091/16078
https://soar-ir.repo.nii.ac.jp/records/12390
https://doi.org/10.1016/j.jhydrol.2011.09.006
10.1016/j.jhydrol.2011.09.006
0022-1694
AA00699543
JOURNAL OF HYDROLOGY
409
3-4
724
736
https://soar-ir.repo.nii.ac.jp/record/12390/files/Effect_groundwater_flow_forming_arsenic_contaminated2.pdf
application/pdf
3.7 MB
2015-09-28