CGRG Bibliography of Canadian Geomorphology
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Author : Anderson, J. and Walker, I.J.
Date : 2005.
Title : Coastal erosion, wave setup and rebuilding of a beach- dune system: Northeast Graham Island, British Columbia, Canada.
Publication : Annual Meeting of the Western Division, Canadian Association of Geographers. March 11-13, 2005. University of Lethbridge, Lethbridge, Alberta.
Issue :
Page(s) :
Abstract
The beach-dune system in Haida Gwaii (Queen Charlotte Islands) was heavily scarped during an on-shore windstorm in the fall of 2003 (100 year event). High astronomical tides (+/- 7.5 m), increased significant wave height (avg. 2.8 m) and high wind speeds (avg. 9.6 ms-1) produced wave setup conditions (7.9 m water level) to erode 1.4 m3 of sediment from the foredune toe and ramp, North Beach, northeast Graham Island. Wave set up was calculated for the region using a formula developed by Holman (1986). A time series of wave setup wave conditions, wind speed and direction were analyzed to identify the presence of more than one wave-scarping event. Rebuilding of the foredune toe and ramp was modeled using a modified approach to ‘the Fryberger method’. While further analysis revealed that the presence of a driftwood-sand matrix (DRM) in the backshore reduced sediment loss, acting to buffer the beach-dune system from further erosion.
Bibliography of Canadian Geomorphology