Utilize este identificador para referenciar este registo:
http://hdl.handle.net/10773/23663
Título: | Bed shear stress under skewed and asymmetric oscillatory flows |
Autor: | Abreu, Tiago Michallet, Hervé Silva, Paulo A. Sancho, Francisco Van Der A, Dominic A. Ruessink, B. G. |
Palavras-chave: | Acceleration skewness Bed shear stress Mobile bed Oscillatory flow tunnel Sand transport Velocity skewness |
Data: | 2013 |
Editora: | Elsevier |
Resumo: | We present a new formulation to predict the bed shear stress under skewed/asymmetric oscillatory flows (with or without a co-linear mean current), extending the work of Nielsen (1992). The nonlinearity of the oscillatory flow is incorporated through the use of two parameters: the index of skewness or nonlinearity, and the waveform parameter. The new formulation is tested against the bed shear stress estimated from the log-fit and momentum-integral methods, using oscillatory data from oscillating water tunnel experiments. The new formulation and the momentum-integral method agree well, but differ from those with the log-fit method, possibly because both methodologies lead to different results for the phase lead between the bed shear stress and the free-stream velocity. The new bed shear stress formulation is incorporated in a quasi-steady bedload formula, and accurately reproduces net transport rates under non-linear, nonbreaking waves with and without an opposing current. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/23663 |
DOI: | 10.1016/j.coastaleng.2012.10.001 |
ISSN: | 0378-3839 |
Aparece nas coleções: | CESAM - Artigos DFis - Artigos |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Abreu et al. - 2013 - Bed shear stress under skewed and asymmetric oscil.pdf | 912.25 kB | Adobe PDF |
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