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Open AccessReview

Salt Marsh Hydrogeology: A Review

1
Department of Civil and Resource Engineering, Dalhousie University, Halifax, NS B3H 4R2, Canada
2
Department of Geological Sciences, University of Delaware, Newark, DE 19716, USA
3
Department of Ocean and Earth Sciences, Old Dominion University, Norfolk, VA 23529, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Carlos Duque
Water 2021, 13(4), 543; https://doi.org/10.3390/w13040543
Received: 15 December 2020 / Revised: 5 February 2021 / Accepted: 9 February 2021 / Published: 20 February 2021
Groundwater–surface water exchange in salt marsh ecosystems mediates nearshore salt, nutrient, and carbon budgets with implications for biological productivity and global climate. Despite their importance, a synthesis of salt marsh groundwater studies is lacking. In this review, we summarize drivers mediating salt marsh hydrogeology, review field and modeling techniques, and discuss patterns of exchange. New data from a Delaware seepage meter study are reported which highlight small-scale spatial variability in exchange rates. A synthesis of the salt marsh hydrogeology literature reveals a positive relationship between tidal range and submarine groundwater discharge but not porewater exchange, highlighting the multidimensional drivers of marsh hydrogeology. Field studies are heavily biased towards microtidal systems of the US East Coast, with little global information available. A preliminary estimate of marsh porewater exchange along the Mid-Atlantic and South Atlantic Bights is 8–30 × 1013 L y−1, equivalent to recirculating the entire volume of seawater overlying the shelf through tidal marsh sediments in ~30–90 years. This review concludes with a discussion of critical questions to address that will decrease uncertainty in global budget estimates and enhance our capacity to predict future responses to global climate change. View Full-Text
Keywords: salt marshes; groundwater–surface water exchange; submarine groundwater discharge; coastal wetlands; porewater exchange salt marshes; groundwater–surface water exchange; submarine groundwater discharge; coastal wetlands; porewater exchange
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MDPI and ACS Style

Guimond, J.; Tamborski, J. Salt Marsh Hydrogeology: A Review. Water 2021, 13, 543. https://doi.org/10.3390/w13040543

AMA Style

Guimond J, Tamborski J. Salt Marsh Hydrogeology: A Review. Water. 2021; 13(4):543. https://doi.org/10.3390/w13040543

Chicago/Turabian Style

Guimond, Julia; Tamborski, Joseph. 2021. "Salt Marsh Hydrogeology: A Review" Water 13, no. 4: 543. https://doi.org/10.3390/w13040543

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