Transformation of surface waves over a bottom step
Article
Article Title | Transformation of surface waves over a bottom step |
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ERA Journal ID | 1918 |
Article Category | Article |
Authors | Kurkin, A. A. (Author), Semin, S. V. (Author) and Stepanyants, Yu A. (Author) |
Journal Title | Russian Academy of Sciences, Izvestiya: Atmospheric and Oceanic Physics |
Journal Citation | 51 (2), pp. 214-223 |
Number of Pages | 10 |
Year | 2015 |
Place of Publication | Russian Federation |
ISSN | 0001-4338 |
1023-6317 | |
1555-628X | |
Digital Object Identifier (DOI) | https://doi.org/10.1134/S0001433815020097 |
Web Address (URL) | http://link.springer.com/article/10.1134%2FS0001433815020097 |
Abstract | We analyze in detail the problem of the transformation of surface gravity waves over a bottom step in a basin of arbitrary depth in the linear approximation. We found that strict analytical results can be obtained only when a denumerable set of modes condensed near the step is taken into account. At the same time, one can use the formulas suggested in this work for the practical calculations. They provide an accuracy of 5% for the wave transmission coefficient. The specific peculiarities of transformation coefficients are discussed, including their nonmonotonic dependence on the parameters, asymptotic behavior at strong depth variations, etc. The data of a direct numerical simulation of wave transformation over a step are presented, which are compared with the exact and approximate formulas. The coefficients of excitation of modes condensed near the step by an incident quasi-monochromatic wave are found. A relationship between the transformation coefficients that follows from the conservation law of wave energy flux is found. |
Keywords | surface waves, wave transformation, transmission coefficient, reflection coefficient, oceanic shelf, bottom step, evanescent modes |
ANZSRC Field of Research 2020 | 401207. Fundamental and theoretical fluid dynamics |
370803. Physical oceanography | |
490109. Theoretical and applied mechanics | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Nizhny Novgorod State Technical University, Russia |
School of Agricultural, Computational and Environmental Sciences | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q309z/transformation-of-surface-waves-over-a-bottom-step
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