Morphodynamics of beach-dune systems laden with large woody debris: Haida Gwaii (Queen Charlotte Islands), British Columbia

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dc.contributor.author Anderson, Jeffrey
dc.date.accessioned 2010-02-22T16:21:22Z
dc.date.available 2010-02-22T16:21:22Z
dc.date.copyright 2009 en
dc.date.issued 2010-02-22T16:21:22Z
dc.identifier.uri http://hdl.handle.net/1828/2252
dc.description.abstract This thesis explores the geomorphic implications of large woody debris (LWD) residing in the backshore of beach-dune systems along the northeastern coasts of Haida Gwaii (Queen Charlotte Islands), British Columbia, Canada. Detailed topographic surveys were employed to quantify seasonal mass balance of the beach-dune systems along two distinctly different coastlines. Erosion and accretion potential models were applied to characterize sediment transport conditions. Holman’s (1986) R2% wave runup model was superimposed on total water levels, to model wave runup exceedence of the beach-dune junction elevation (6.5 m aCD). Modelled ‘erosion potential’ hours were demonstrated to correspond with observed erosion including removal of the LWD zone, resulting in decreased mass balance. Similarly, Fryberger and Dean’s (1979) Drift Potential model was used to model accretion potential hours. Modelled accretion potential hours were also able to effectively describe conditions when actual accretion occurred. The presence of LWD in the backshore offered two functions to the above processes: it acted effectively as an ‘accretion anchor’, promoting increased mass balance and rebuilding of the incipient foredune; and, it offered a mass of sediment fronting the foredune to protect the beach-dune system from storm wave attack and subsequent erosion. en
dc.language English eng
dc.language.iso en en
dc.rights Available to the World Wide Web en
dc.subject Coastal Geomorphology en
dc.subject Beach-Dune Processes en
dc.subject Wave Runup en
dc.subject Coastal Erosion en
dc.subject Large Woody Debris en
dc.title Morphodynamics of beach-dune systems laden with large woody debris: Haida Gwaii (Queen Charlotte Islands), British Columbia en
dc.type Thesis en
dc.contributor.supervisor Walker, Ian J.
dc.degree.department Dept. of Geography en
dc.degree.level Master of Science M.Sc. en

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