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Megacity pumping and preferential flow threaten groundwater quality

Mahfuzur R. Khan; Mohammad Koneshloo; Peter Knappett; Kazi Matin Ahmed; Benjamin C. Bostick; Brian Justin Mailloux; Rajib Hassan Mozumder; Anwar Zahid; Charles F. Harvey; Alexander van Geen; Holly A. Michael

Title:
Megacity pumping and preferential flow threaten groundwater quality
Author(s):
Khan, Mahfuzur R.
Koneshloo, Mohammad
Knappett, Peter
Ahmed, Kazi Matin
Bostick, Benjamin C.
Mailloux, Brian Justin
Mozumder, Rajib Hassan
Zahid, Anwar
Harvey, Charles F.
van Geen, Alexander
Michael, Holly A.
Date:
Type:
Articles
Department(s):
Lamont-Doherty Earth Observatory
Environmental Science (Barnard College)
Volume:
7
Persistent URL:
Book/Journal Title:
Nature Communications
Geographic Area:
Bangladesh--Dhaka
Abstract:
Many of the world’s megacities depend on groundwater from geologically complex aquifers that are over-exploited and threatened by contamination. Here, using the example of Dhaka, Bangladesh, we illustrate how interactions between aquifer heterogeneity and groundwater exploitation jeopardize groundwater resources regionally. Groundwater pumping in Dhaka has caused large-scale drawdown that extends into outlying areas where arsenic-contaminated shallow groundwater is pervasive and has potential to migrate downward. We evaluate the vulnerability of deep, low-arsenic groundwater with groundwater models that incorporate geostatistical simulations of aquifer heterogeneity. Simulations show that preferential flow through stratigraphy typical of fluvio-deltaic aquifers could contaminate deep (>150 m) groundwater within a decade, nearly a century faster than predicted through homogeneous models calibrated to the same data. The most critical fast flowpaths cannot be predicted by simplified models or identified by standard measurements. Such complex vulnerability beyond city limits could become a limiting factor for megacity groundwater supplies in aquifers worldwide.
Subject(s):
Groundwater--Management
Groundwater--Pollution
Municipal water supply
Aquifers
Publisher DOI:
https://doi.org/10.1038/ncomms12833
Item views
20
Metadata:
text | xml
Suggested Citation:
Mahfuzur R. Khan, Mohammad Koneshloo, Peter Knappett, Kazi Matin Ahmed, Benjamin C. Bostick, Brian Justin Mailloux, Rajib Hassan Mozumder, Anwar Zahid, Charles F. Harvey, Alexander van Geen, Holly A. Michael, , Megacity pumping and preferential flow threaten groundwater quality, Columbia University Academic Commons, .

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