CGRG Bibliography of Canadian Geomorphology
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Author : Cumming, B.; and Walker, I.
Date : 2006.
Title : Fetch length and driftwood-induced roughness effects on airflow dynamics over a macro-tidal beach-dune system: NE Graham Island, British Columbia, Canada.
Publication : Annual Meeting, Western Division of the Canadian Association of Geographers, March 10-11, 2006. Thompson Rivers University, Kamloops, British Columbia.
Issue : Abstract Volume.
Page(s) : 7.
Abstract
Interactions between wind speed and direction, backshore surface roughness (e.g., driftwood, vegetation), and beach-dune topography play a key role in the morphodynamics of macrotidal beach-dune systems by influencing rates of sand transport. This study examines detailed measurements of near-surface, three-dimensional airflow over a shore-normal transect of a macrotidal, forest-backed beach-dune system with a distinct backshore driftwood jam (DWJ). \r\n The DWJ poses an abrupt roughness change on near-surface flow that extracts momentum and sediment, largely during onshore winds with shorter beach fetch length. Although the ability to calculate shear stress and predict sand transport using single instruments is limited, implications for sand transport and dune maintenance are discussed. This study provides new evidence on the influence of anthropogenic and ecological factors (e.g., DWJ and colonizing trees) on airflow dynamics that may have important implications for beach-dune sediment transport and morphodynamics.
Bibliography of Canadian Geomorphology