Abstract
Twenty-three estimates of soil subsidence rates arising under the influence of local hydrologic changes from flap-gates, weirs, dikes, and culverts in tidal wetlands were compared to 75 examples of subsidence in drained agricultural wetlands. The induced subsidence rates from these hydrologic modifications in tidal wetlands can continue for more than 100 years, and range between 1.67 to 0.10 cm yr−1 within 1 to 155 years after the hydrologic modifications commence. These subsidence rates are lower than in freshwater wetlands drained for agricultural purposes, decline with age, and are significant in comparison to the rates of global sea level rise or the average soil accretion rates. The elevation change resulting from local hydrologic manipulations is significant with respect to the narrow range of flood tolerances of salt marsh plants, especially in microtidal environments.
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Eugene Turner, R. Coastal wetland subsidence arising from local hydrologic manipulations. Estuaries 27, 265–272 (2004). https://doi.org/10.1007/BF02803383
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DOI: https://doi.org/10.1007/BF02803383