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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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. |
doi_str_mv | 10.4319/lo.2007.52.3.1231 |
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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.</description><identifier>ISSN: 0024-3590</identifier><identifier>EISSN: 1939-5590</identifier><identifier>DOI: 10.4319/lo.2007.52.3.1231</identifier><identifier>CODEN: LIOCAH</identifier><language>eng</language><publisher>Waco, TX: The American Society of Limnology and Oceanography</publisher><subject>Brackish ; Coasts ; Delta soils ; Earth sciences ; Earth, ocean, space ; Engineering and environment geology. 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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.</description><subject>Brackish</subject><subject>Coasts</subject><subject>Delta soils</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Engineering and environment geology. Geothermics</subject><subject>Estuaries</subject><subject>Exact sciences and technology</subject><subject>Freshwater</subject><subject>Hurricanes</subject><subject>Marine</subject><subject>Marine and continental quaternary</subject><subject>Natural hazards: prediction, damages, etc</subject><subject>River basins</subject><subject>Salt marshes</subject><subject>Sedimentary soils</subject><subject>Sediments</subject><subject>Surficial geology</subject><subject>Suspended solids</subject><subject>Wetlands</subject><issn>0024-3590</issn><issn>1939-5590</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2007</creationdate><recordtype>article</recordtype><recordid>eNqFUE1LAzEUDKJgrf4AwUMuets1n7sbwYMUtYVqD1WvIWyyNSXd1GQX6b83ZYsePb3hMTNv3gBwiVHOKBa3zucEoTLnJKc5JhQfgREWVGScC3QMRggRltGET8FZjGuEkOCcj8B82odga9UauLSrVrkIbQuXynXwRYX4CZdG241pu3gHZ60PK9XaGi59H2oToWp1wtbBD-_6jTkHJ01yMBeHOQbvT49vk2k2XzzPJg_zTDFW4qxqCEZYa0GLqjaYEqEaWhYGGa44abhgFaIN11gzWhlSCd1UGqmqSKkR05qOwc3guw3-qzexkxsba-NcesP3URJUYE45T0Q8EOvgYwymkdtgNyrsJEZy35t0Xu57k5xIKve9Jc31wVzFWrkmqLa28U9YlaLEKeAY3A-8b-vM7n9jOX9d7Dc84eHO1aBfx86HXz1jQhSC0h8_74fC</recordid><startdate>200705</startdate><enddate>200705</enddate><creator>Turner, R. 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Geothermics</topic><topic>Estuaries</topic><topic>Exact sciences and technology</topic><topic>Freshwater</topic><topic>Hurricanes</topic><topic>Marine</topic><topic>Marine and continental quaternary</topic><topic>Natural hazards: prediction, damages, etc</topic><topic>River basins</topic><topic>Salt marshes</topic><topic>Sedimentary soils</topic><topic>Sediments</topic><topic>Surficial geology</topic><topic>Suspended solids</topic><topic>Wetlands</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Turner, R. Eugene</creatorcontrib><creatorcontrib>Swenson, Erick M.</creatorcontrib><creatorcontrib>Charles S. Milan</creatorcontrib><creatorcontrib>James M. 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Eugene</au><au>Swenson, Erick M.</au><au>Charles S. Milan</au><au>James M. Lee</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Hurricane Signals in Salt Marsh Sediments: Inorganic Sources and Soil Volume</atitle><jtitle>Limnology and oceanography</jtitle><date>2007-05</date><risdate>2007</risdate><volume>52</volume><issue>3</issue><spage>1231</spage><epage>1238</epage><pages>1231-1238</pages><issn>0024-3590</issn><eissn>1939-5590</eissn><coden>LIOCAH</coden><abstract>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. 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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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