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Dec 31, 2015
Field Investigations of Suspended Sediment Transport in the Nearshore Zone
Authors: R. W. Sternberg, N. C. Shi, and John P. DowningAuthor Affiliations
Publication: Coastal Engineering 1984
Abstract
The suspended sediment distribution and longshore sediment transport characteristics at Leadbetter Beach, Santa Barbara, California were investigated using a series of miniature optical backscatter sensors which can measure particle concentrations as high as 180 gm/l and have 10 Hz frequency response. Vertical arrays of sensors were maintained at up to four positions across the surf zone during 7-25 February 1980 and were operated concurrently with pressure sensors and current meters. Data were collected on a daily basis over 2-4 hour periods.
The data were analyzed to reveal concentration profiles of suspended sediment, the average suspended sediment loads, and the longshore particle flux in relation to varying wave conditions. Results show that sediment transport occurs as individual suspension events related to incident wave motions and infragravity motion oscillations within the surf zone; suspended sediment concentration decreases approximately logarithimically away from the seabed; the maximum values of longshore transport rates occur in the mid-surf zone; and the measured suspended sediment longshore transport rate is equal to the total longshore transport rate as predicted by existing transport equations.
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Published In
Coastal Engineering 1984
Pages: 1782 - 1798
Copyright
© 1985 American Society of Civil Engineers.
History
Published online: Dec 31, 2015
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Authors
Affiliations
R. W. Sternberg
School of Oceanography, University of Washington, Seattle, WA 98195
N. C. Shi
Virginia Institute of Marine Science, Gloucester Point, VA 23062
John P. Downing
Northern Technical Services, 117 Lake Street South, Kirkland, HA 98033
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