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Submarine Groundwater Discharge and Seawater Intrusion: Two sides of the same coin that are rarely studied simultaneously
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  • Daniel Kretschmer,
  • Holly A Michael,
  • Nils Moosdorf,
  • Gualbert Oude Essink,
  • Marc F.P. Bierkens,
  • Thorsten Wagener,
  • Robert Reinecke
Daniel Kretschmer
Johannes Gutenberg-University Mainz

Corresponding Author:[email protected]

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Holly A Michael
University of Delaware
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Nils Moosdorf
Leibniz Center for Tropical Marine Research (ZMT)
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Gualbert Oude Essink
Deltares - Subsurface and Groundwater Systems
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Marc F.P. Bierkens
Department of Physical Geography, Utrecht University
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Thorsten Wagener
University of Potsdam
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Robert Reinecke
University Mainz
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Fresh submarine groundwater discharge (SGD) and seawater intrusion (SWI) are complementary processes at the interface of coastal groundwater and oceans. Multiple common drivers enable or limit SGD and SWI. However, we find that SGD and SWI are rarely studied simultaneously. In this meta-analysis, we synthesize 1298 publications, examining drivers of SGD and SWI, where and why they are studied, and at which scales they are impacted by their drivers. Studies of SGD and SWI accumulate in urban coastal basins with high gross domestic product (GDP), and high permeabilities, where measurable groundwater fluxes are expected. We find, that studies investigate various drivers, but rarely assess the scales they act at. Effects of temporally recurring processes (e.g., tides) are studied more often and are better known than effects of spatial variability (e.g., permeability). Future studies should investigate SGD and SWI simultaneously, report impact scales of drivers explicitly and explore unchartered coastlines.
09 Jun 2023Submitted to ESS Open Archive
11 Jun 2023Published in ESS Open Archive