Chapter
Dec 31, 2015
Variability of Longshore Currents
Authors: R. T. Guza and E. B. ThorntonAuthor Affiliations
Publication: Coastal Engineering 1978
Abstract
Simultaneous measurements were made of the offshore directional spectra of gravity waves, and longshore currents within the surf zone. The goal was to test theories which suggest a direct relationship between mean longshore currents ( ) in the surf zone and offshore values of the offaxis component of radiation stress (SXY). Seventeen minute averages of both SXY and showed considerable temporal variation, and little or no tendency to vary together. There was also considerable longshore spatial variability of the longshore" current. Attempts to measure gradients of SXY in the surf zone failed because of small errors in instrument orientation. The measurements suggest that considerable temporal and spatial averaging will generally be required to obtain a representative picture of longshore currents, even if no rip currents are present, due to the presence of “eddy” motions or long edge waves.
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© 1978 American Society of Civil Engineers.
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Published online: Dec 31, 2015
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R. T. Guza
Asst. Professor, Shore Processes Lab, Scripps Inst. Oceanography, La Jolla, California
E. B. Thornton
Assoc. Professor, Naval Postgraduate School, Monterey, CA
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