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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/3078

Title: Modification of a linear bar-trough system by a standing edge wave
Authors: Bauer, Bernard O.,
Greenwood, Brian,
Issue Date: 1990
Publisher: Elsevier Science
Citation: Marine Geology 92 (1990) 177-204
Abstract: Detailed fluid motions and bathymetric changes in the lacustrine nearshore zone at Wymbolwood Beach, Georgian Bay, Canada were monitored during storms to test theoretical postulates about the importance of low-frequency wave motions to nearshore circulation of water and sediments. Eighteen continuous-resistance wave staffs and two electromagnetic current meters were deployed along one shore-normal and two shore-parallel instrument arrays over a period of two months. During one intense storm, a mode 3, standing edge wave at 0.035 Hz was the predominant low-frequency motion. Prior to the storm, the bathymetry was characterized by linear bar-trough systems, and during the storm, these features migrated onshore and became rhythmic in response to the length scales and relatively fixed locations of nodal and antinodal lines of the standing edge wave. However, a well-defined crescentic bar, as predicted by the model under the condition of zero net sediment flux divergence, did not evolve because the hydrodynamic forcing ceased before an equilibrium condition could be attained. Nevertheless, the location of scour and accretion features demonstrated the tendency towards such a crescentic form. The offshore and alongshore irregularities of the post-storm bathymetry are not readily explained by alternative hydrodynamic interactions.
URI: http://hdl.handle.net/1807/3078
Appears in Collections:Environmental Science

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