CGRG Bibliography of Canadian Geomorphology
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Author : Armstrong, D.
Date : 1990
Title : Spatial and temporal beach profile variation associated with a longshore sandwave.
Publication : Unpublished Masters thesis. University of Guelph, Guelph.
Issue :
Page(s) : 191 p.
Abstract
A total of twenty-three days of data was collected from three study sites associated with a longshore sandwave between June and September 1988. Five lines of metal stakes, spanning a 40 m. wide section of the swash zone, were used to obtain hourly measurements of beach profile change at each site. Simultaneous measurement of wind, wave, lake level, run-up, and beach water table changes provided information which aided in the interpretation of the observed profile changes. Wind velocity, in particular, was recognized as a driving force in beach profile change and was used to delineate three environmental scenarios in order to group the data. Subsequently, six categories of beach change were identified: bar welding, profile accretion, profile flattening, berm overtopping and steepening, dynamic equilibrium and three-dimensional beach change. These beach changes were not unrelated but, rather, represented a suite of beach responses from which an eight stage model of two-dimensional beach profile change was developed. This non-tidal model was found to complement the tidal model of Sonu and Van Beek (1971). Finally, because the data were collected hourly, it was possible to present detailed information about the process of bar welding. It was also discovered that run-up in a non-tidal environment may control water table slope in much the same way as a tide.
Bibliography of Canadian Geomorphology