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dc.contributor.authorMcGuire, Luke A.
dc.contributor.authorKean, Jason W.
dc.contributor.authorStaley, Dennis M.
dc.contributor.authorRengers, Francis K.
dc.contributor.authorWasklewicz, Thad A.
dc.date.accessioned2017-03-03T18:21:16Z
dc.date.available2017-03-03T18:21:16Z
dc.date.issued2016-11
dc.identifier.citationConstraining the relative importance of raindrop- and flow-driven sediment transport mechanisms in postwildfire environments and implications for recovery time scales 2016, 121 (11):2211 Journal of Geophysical Research: Earth Surfaceen
dc.identifier.issn21699003
dc.identifier.doi10.1002/2016JF003867
dc.identifier.urihttp://hdl.handle.net/10150/622763
dc.description.abstractMountain watersheds recently burned by wildfire often experience greater amounts of runoff and increased rates of sediment transport relative to similar unburned areas. Given the sedimentation and debris flow threats caused by increases in erosion, more work is needed to better understand the physical mechanisms responsible for the observed increase in sediment transport in burned environments and the time scale over which a heightened geomorphic response can be expected. In this study, we quantified the relative importance of different hillslope erosion mechanisms during two postwildfire rainstorms at a drainage basin in Southern California by combining terrestrial laser scanner-derived maps of topographic change, field measurements, and numerical modeling of overland flow and sediment transport. Numerous debris flows were initiated by runoff at our study area during a long-duration storm of relatively modest intensity. Despite the presence of a well-developed rill network, numerical model results suggest that the majority of eroded hillslope sediment during this long-duration rainstorm was transported by raindrop-induced sediment transport processes, highlighting the importance of raindrop-driven processes in supplying channels with potential debris flow material. We also used the numerical model to explore relationships between postwildfire storm characteristics, vegetation cover, soil infiltration capacity, and the total volume of eroded sediment from a synthetic hillslope for different end-member erosion regimes. This study adds to our understanding of sediment transport in steep, postwildfire landscapes and shows how data from field monitoring can be combined with numerical modeling of sediment transport to isolate the processes leading to increased erosion in burned areas.
dc.description.sponsorshipNational Geographic Society [Proposal002929-2009-0046-1]; National Science Foundation [02-39749, 09-34131]; U.S. Geological Survey (USGS) Landslide Hazards Programen
dc.language.isoenen
dc.publisherAMER GEOPHYSICAL UNIONen
dc.relation.urlhttp://doi.wiley.com/10.1002/2016JF003867en
dc.rights©2016. American Geophysical Union. All Rights Reserved.en
dc.subjectwildfireen
dc.subjectsediment transporten
dc.subjectnumerical modelen
dc.subjecterosionen
dc.subjectdebris flowen
dc.titleConstraining the relative importance of raindrop- and flow-driven sediment transport mechanisms in postwildfire environments and implications for recovery time scalesen
dc.typeArticleen
dc.contributor.departmentUniv Arizona, Dept Geoscien
dc.identifier.journalJournal of Geophysical Research: Earth Surfaceen
dc.description.note6 month embargo; First Published: 22 November 2016en
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal published versionen
dc.contributor.institutionU.S. Geological Survey; Denver Colorado USA
dc.contributor.institutionU.S. Geological Survey; Denver Colorado USA
dc.contributor.institutionU.S. Geological Survey; Denver Colorado USA
dc.contributor.institutionU.S. Geological Survey; Denver Colorado USA
dc.contributor.institutionDepartment of Geography; East Carolina University; Greenville North Carolina USA
refterms.dateFOA2017-05-23T00:00:00Z
html.description.abstractMountain watersheds recently burned by wildfire often experience greater amounts of runoff and increased rates of sediment transport relative to similar unburned areas. Given the sedimentation and debris flow threats caused by increases in erosion, more work is needed to better understand the physical mechanisms responsible for the observed increase in sediment transport in burned environments and the time scale over which a heightened geomorphic response can be expected. In this study, we quantified the relative importance of different hillslope erosion mechanisms during two postwildfire rainstorms at a drainage basin in Southern California by combining terrestrial laser scanner-derived maps of topographic change, field measurements, and numerical modeling of overland flow and sediment transport. Numerous debris flows were initiated by runoff at our study area during a long-duration storm of relatively modest intensity. Despite the presence of a well-developed rill network, numerical model results suggest that the majority of eroded hillslope sediment during this long-duration rainstorm was transported by raindrop-induced sediment transport processes, highlighting the importance of raindrop-driven processes in supplying channels with potential debris flow material. We also used the numerical model to explore relationships between postwildfire storm characteristics, vegetation cover, soil infiltration capacity, and the total volume of eroded sediment from a synthetic hillslope for different end-member erosion regimes. This study adds to our understanding of sediment transport in steep, postwildfire landscapes and shows how data from field monitoring can be combined with numerical modeling of sediment transport to isolate the processes leading to increased erosion in burned areas.


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