Tracing groundwater recharge sources in the northwestern Indian alluvial aquifer using water isotopes (δ18O, δ2H and 3H)

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Title: Tracing groundwater recharge sources in the northwestern Indian alluvial aquifer using water isotopes (δ18O, δ2H and 3H)
Author(s): Joshi, SK
Rai, SP
Sinha, R
Gupta, S
Densmore, AL
Rawat, YS
Shekhar, S
Item Type: Journal Article
Abstract: Rapid groundwater depletion from the northwestern Indian aquifer system in the western Indo-Gangetic basin has raised serious concerns over the sustainability of groundwater and the livelihoods that depend on it. Sustainable management of this aquifer system requires that we understand the sources and rates of groundwater recharge, however, both these parameters are poorly constrained in this region. Here we analyse the isotopic (δ18O, δ2H and tritium) compositions of groundwater, precipitation, river and canal water to identify the recharge sources, zones of recharge, and groundwater flow in the Ghaggar River basin, which lies between the Himalayan-fed Yamuna and Sutlej River systems in northwestern India. Our results reveal that local precipitation is the main source of groundwater recharge. However, depleted δ18O and δ2H signatures at some sites indicate recharge from canal seepage and irrigation return flow. The spatial variability of δ18O, δ2H, d-excess, and tritium reflects limited lateral connectivity due to the heterogeneous and anisotropic nature of the aquifer system in the study area. The variation of tritium concentration with depth suggests that groundwater above c. 80 mbgl is generally modern water. In contrast, water from below c. 80 mbgl is a mixture of modern and old waters, and indicates longer residence time in comparison to groundwater above c. 80 mbgl. Isotopic signatures of δ18O, δ2H and tritium suggest significant vertical recharge down to a depth of 320 mbgl. The spatial and vertical variations of isotopic signature of groundwater reveal two distinct flow patterns in the aquifer system: (i) local flow (above c.80 mbgl) throughout the study area, and (ii) intermediate and regional flow (below c. 80 mbgl), where water recharges aquifers through large-scale lateral flow as well as vertical infiltration. The understanding of spatial and vertical recharge processes of groundwater in the study area provides important base-line knowledge for developing a sustainable groundwater management plan for the northwestern Indian aquifer system.
Publication Date: 1-Apr-2018
Date of Acceptance: 18-Feb-2018
URI: http://hdl.handle.net/10044/1/57293
DOI: https://dx.doi.org/10.1016/j.jhydrol.2018.02.056
ISSN: 0022-1694
Publisher: Elsevier
Start Page: 835
End Page: 847
Journal / Book Title: Journal of Hydrology
Volume: 559
Sponsor/Funder: Natural Environment Research Council (NERC)
Funder's Grant Number: NE/I022604/1
Copyright Statement: © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/)
Keywords: Science & Technology
Technology
Physical Sciences
Engineering, Civil
Geosciences, Multidisciplinary
Water Resources
Engineering
Geology
Water isotopes
Recharge sources
Recharge zones
Groundwater flow
Northwestern Indian aquifer
STABLE-ISOTOPES
VEDIC SARASWATI
GLOBAL PROBLEM
SURFACE-WATER
PRECIPITATION
DEPLETION
HARYANA
SYSTEM
DELHI
BASIN
MD Multidisciplinary
Environmental Engineering
Publication Status: Published
Open Access location: https://doi.org/10.1016/j.jhydrol.2018.02.056
Online Publication Date: 2018-02-27
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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