A simple system for laser-illuminated video imaging of sedimentsuspension and bed topography |
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| Authors: | Crawford AM Hay AE |
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| Institution: | Dept. of Phys. & Phys. Oceanogr., Memorial Univ. of Newfoundland, St. John's, Nfld.; |
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| Abstract: | A simple underwater video system has been developed for simultaneously imaging sediment suspension and monitoring bed profiles under waves and combined wave-current flows. This consists of a diode-laser-generated light plane and a black-and-white underwater video camera. The laser light illuminates suspended material in section and also provides a bed profile at the bottom. Orthogonal laser/camera pairs are used to obtain both cross-shore and alongshore views. During deployments, the system has been augmented by acoustic backscatter devices for measurement of sediment concentration. As with all video techniques, visibility is a limiting factor, but where turbidity is low to moderate, the results are encouraging. Results on cross-shore and alongshore bed elevation variations and suspension event stales obtained with the video/laser system are presented for two experiments: one at the National Research Council Wave Research Flume in Ottawa, Canada, and the other in the field at Queensland Beach, N.S., Canada, |
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