Chapter
Apr 26, 2012
An Approach to Measuring Turbulent Stresses in the Nearshore Region
Publication: Coastal Engineering 2000
Abstract
The velocity field is modeled for sea waves propagating over a sloping bottom covered by megaripples. The flow is assumed to be irrotational, and long waves of small amplitude are considered. The analysis has been carried out to investigate whether an appropriate rotation of the coordinate system exists such that the cross-correlation of the velocity components due to waves vanishes, allowing an estimate of turbulent Reynolds stresses from the correlation between tilt corrected vertical and horizontal velocity components. The results show that such a system exists, and that the tilting angle depends on the bottom profile and on the characteristics of the wave field. As suggested by Stanton and Thornton (1996), the angle can be computed by minimizing the measured cross-correlation. However the present analysis suggests that the procedure should consider different wave components separately and should be applied sequentially at different heights from the bottom.
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© 2001 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Paolo Blondeaux
Environmental Engineering Department — University of Genova, Via Montallegro 1, 16145 Genova, Italy
Timothy Stanton
Department of Oceanography — Naval Postgraduate School Monterey, 93940 California, U.S.A.
Edward Thornton
Department of Oceanography — Naval Postgraduate School Monterey, 93940 California, U.S.A.
Giovanna Vittori
Environmental Engineering Department — University of Genova, Via Montallegro 1, 16145 Genova, Italy
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