Modeling shallow autocompaction in coastal marshes using cesium-137 fallout: Preliminary results from the Trinity River Estuary, Texas

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dc.acquisition-srcDownloaded from-Web of Scienceen_US
dc.call-noen_US
dc.contract-noen_US
dc.contributor.authorWilliams Hen_US
dc.contributor.otherJournal of Coastal Researchen_US
dc.date.accessioned2010-02-15T17:18:05Z
dc.date.available2010-02-15T17:18:05Z
dc.date.issued2003 WINen_US
dc.degreeen_US
dc.description180-188en_US
dc.description-otheren_US
dc.description.abstractAccurate prediction of changes in the relative elevation of coastal marsh surfaces has gained considerable importance in light of global-warming-induced sea-level rise. Shallow autocompaction is an important component of elevation change that acts to decrease relative elevation. Unlike vertical accretion, which can be determined from repeated surveys of artificial marker horizons, autocompaction is difficult to measure. This report presents the results of a preliminary study that uses cesium-137 dating and down-core measurements of sediment bulk density to numerically model vertical accretion, shallow autocompaction and surface elevation change. The models produce vertical accretion rates that are comparable to rates derived from artificial marker horizons, and long-term surface elevation changes that are in close agreement with sedimentation rates based on cesium-137 dating of well-compacted sediment. The model results suggest that average annual vertical accretion may be higher than average annual surface elevation change by a factor of 1.6 to 21. Sedimentation rates derived from cesium-137 dating also are higher than average annual surface elevation change by a factor of 1.1 to 4.7. These findings suggest that sedimentation rates based on cesium-137 dating will tend to be lower than vertical accretion and higher than long-term surface elevation change. The results of the study re-emphasize the importance of fully accounting for shallow autocompaction when attempting to predict marsh surface elevation changeen_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.historyen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/23582
dc.latitudeen_US
dc.locationen_US
dc.longitudeen_US
dc.notesTimes Cited: 0ArticleEnglishWilliams, HUniv N Texas, Dept Geog, Denton, TX 76203 USACited References Count: 36669WU810 EAST 10TH STREET, LAWRENCE, KS 66044 USALAWRENCEen_US
dc.placeen_US
dc.publisheren_US
dc.relation.ispartofseries51237.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesen_US
dc.subjectACCRETIONen_US
dc.subjectbulk densityen_US
dc.subjectCOASTALen_US
dc.subjectcoastal marshen_US
dc.subjectCS-137en_US
dc.subjectDELTAen_US
dc.subjectDYNAMICSen_US
dc.subjectelevationen_US
dc.subjectestuariesen_US
dc.subjectESTUARYen_US
dc.subjectLOUISIANAen_US
dc.subjectMARSHen_US
dc.subjectmodelingen_US
dc.subjectPATTERNSen_US
dc.subjectpredictionen_US
dc.subjectRATESen_US
dc.subjectRIVER ESTUARYen_US
dc.subjectSALT-MARSHen_US
dc.subjectSEA-LEVELen_US
dc.subjectsea-level riseen_US
dc.subjectSEDIMENT ACCUMULATION RATESen_US
dc.subjectSEDIMENTATIONen_US
dc.subjectsedimentation rateen_US
dc.subjectSURFACEen_US
dc.subjectsurveyen_US
dc.subjectTEXASen_US
dc.subjectTIDAL MARSHen_US
dc.subjectTrinity Riveren_US
dc.subjectTXen_US
dc.subjectUSAen_US
dc.subjectvertical accretionen_US
dc.titleModeling shallow autocompaction in coastal marshes using cesium-137 fallout: Preliminary results from the Trinity River Estuary, Texasen_US
dc.typeJournalen_US
dc.universityen_US
dc.vol-issue19(1)en_US

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