Hurricane Signals in Salt Marsh Sediments: Inorganic Sources and Soil Volume

The inorganic content of 51 dated sediment cores from Mississippi River deltaic plain salt marsh wetlands peaks with the landfall of hurricanes. Variations in the inorganic sediment content demonstrate no temporal coherence with changes in either the Mississippi River suspended matter concentration...

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Veröffentlicht in:Limnology and oceanography 2007-05, Vol.52 (3), p.1231-1238
Hauptverfasser: Turner, R. Eugene, Swenson, Erick M., Charles S. Milan, James M. Lee
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container_title Limnology and oceanography
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creator Turner, R. Eugene
Swenson, Erick M.
Charles S. Milan
James M. Lee
description The inorganic content of 51 dated sediment cores from Mississippi River deltaic plain salt marsh wetlands peaks with the landfall of hurricanes. Variations in the inorganic sediment content demonstrate no temporal coherence with changes in either the Mississippi River suspended matter concentration or discharge, or with wetland losses on this coast. The inorganic matter brought to wetlands during hurricanes is sufficient to account for the accumulated inorganic sediment, and the volume averages 9% of the soil volume. A "sediment deficit" hypothesis, which makes a causal connection between a changing inorganic supply and the dramatically high wetland losses on this coast, is therefore rejected. Our results support the hypothesis that wetlands of an undeveloped coast receive the majority of their inorganic sediments from offshore and not from overbank flooding or through crevasses. Restoration and wetland maintenance (prevention) goals should be implemented with this in mind: the coastal wetland losses of the last century along this coast appear to be a consequence of the diminished accumulation of organic matter and not from variations in inorganic sediment loading.
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source Wiley Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; JSTOR Archive Collection A-Z Listing; Wiley Online Library (Open Access Collection); Alma/SFX Local Collection
subjects Brackish
Coasts
Delta soils
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Estuaries
Exact sciences and technology
Freshwater
Hurricanes
Marine
Marine and continental quaternary
Natural hazards: prediction, damages, etc
River basins
Salt marshes
Sedimentary soils
Sediments
Surficial geology
Suspended solids
Wetlands
title Hurricane Signals in Salt Marsh Sediments: Inorganic Sources and Soil Volume
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