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Strongly heterogeneous patterns of groundwater depletion in northwestern India

Joshi, S.K. and Gupta, S. and Sinha, R. and Densmore, A.L. and Rai, S.P. and Shekhar, S. and Mason, P.J. and van Dijk, W.M. (2021) 'Strongly heterogeneous patterns of groundwater depletion in northwestern India.', Journal of hydrology., 598 . p. 126492.

Abstract

Northwestern India has been identified as a significant hotspot of groundwater depletion, with major implications for groundwater sustainability caused by excessive abstraction. We know relatively little about the detailed spatial and temporal changes in groundwater storage in this region, nor do we understand the interplay of factors controlling these changes. Groundwater managers and policymakers in India require such information to monitor groundwater development and make strategic decisions for the sustainable management of groundwater. Here, we characterise high resolution spatio-temporal variability in groundwater levels and storage change across northwestern India through analysis of in situ measurements of historical groundwater level data. We note a slow gain in groundwater storage of +0.58 ± 0.35 km3 for the pre-monsoon and +0.40 ± 0.35 km3 for the post-monsoon period between 1974 and 2001. However, from 2002 to 2010, groundwater storage was rapidly depleted by -32.30 ± 0.34 km3 in the pre-monsoon and -24.42 ± 0.34 km3 in the post monsoon period. Importantly, we observe marked spatial heterogeneity in groundwater levels and storage change and distinct hotspots of groundwater depletion with lateral length scales of tens of kilometers. Spatial variability in groundwater abstraction partially explains the depletion pattern, but we also find that the sedimentological heterogeneity of the aquifer system correlates broadly with long-term patterns of groundwater-level change. This correlation, along with the spatial agreement between groundwater level change and water quality, provides a framework for anticipating future depletion patterns and guiding groundwater monitoring and domain-specific management strategies.

Item Type:Article
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Available under License - Creative Commons Attribution Non-commercial No Derivatives 4.0.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1016/j.jhydrol.2021.126492
Publisher statement:© 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Date accepted:23 May 2021
Date deposited:25 May 2021
Date of first online publication:26 May 2021
Date first made open access:02 June 2021

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