Estimation of Overwash Bore Velocities Using Video Techniques

by K. Todd Holland, Oregon State Univ, Corvallis, United States,
Robert A. Holman, Oregon State Univ, Corvallis, United States,
Asbury H. Sallenger, Jr., Oregon State Univ, Corvallis, United States,

Document Type: Proceeding Paper

Part of: Coastal Sediments


Overwash data were collected at a site on the Isles Dernieres, LA barrier island chain during Hurricane Gilbert in September 1988. A video technique was applied that allowed the quantification of overwash bore celerity vectors along several cross-shore transects. Maximum celerities were found to exceed 2 m/sec. The cross-beach velocity structure can be generally characterized as having a maximum celerity at the berm crest with a linear decrease in velocity across the washover flat. Using the celerity results, a simple model of cross-beach overwash sediment transport is discussed.

Subject Headings: Sediment transport | Wave velocity | Barrier islands | Hurricanes and typhoons | Beaches | Erosion | Imaging techniques

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