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Enhanced recharge rates by altered recharge sensitivity to climate variability through subsurface heterogeneity

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)2842-2847
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume114
Issue number11
Early online date27 Feb 2017
DOIs
DateAccepted/In press - 16 Sep 2016
DateE-pub ahead of print - 27 Feb 2017
DatePublished (current) - 14 Mar 2017

Abstract

Our environment is heterogeneous. In hydrological sciences, the heterogeneity of subsurface properties, such as hydraulic conductivities or porosities, exerts an important control on water balance. This notably includes groundwater recharge, which is an important variable for efficient and sustainable groundwater resources management. Current large-scale hydrological models do not adequately consider this subsurface heterogeneity. Here we show that regions with strong subsurface heterogeneity have enhanced present and future recharge rates due to a different sensitivity of recharge to climate variability compared with regions with homogeneous subsurface properties. Our study domain comprises the carbonate rock regions of Europe, Northern Africa, and the Middle East, which cover ∼25% of the total land area. We compare the simulations of two large-scale hydrological models, one of them accounting for subsurface heterogeneity. Carbonate rock regions strongly exhibit “karstification,” which is known to produce particularly strong subsurface heterogeneity. Aquifers from these regions contribute up to half of the drinking water supply for some European countries. Our results suggest that water management for these regions cannot rely on most of the presently available projections of groundwater recharge because spatially variable storages and spatial concentration of recharge result in actual recharge rates that are up to four times larger for present conditions and changes up to five times larger for potential future conditions than previously estimated. These differences in recharge rates for strongly heterogeneous regions suggest a need for groundwater management strategies that are adapted to the fast transit of water from the surface to the aquifers.

    Research areas

  • groundwater recharge, subsurface heterogeneity, water resources, climate variability, climate change

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via PNAS at http://www.pnas.org/content/114/11/2842. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 6.52 MB, PDF document

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