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dc.contributor.authorAbreu, T.pt_BR
dc.contributor.authorMichallet, H.pt_BR
dc.contributor.authorSilva, P. A.pt_BR
dc.contributor.authorSancho, F. E.pt_BR
dc.contributor.authorVan der A, D. A.pt_BR
dc.contributor.authorRuessink, B. G.pt_BR
dc.description.abstractWe 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.pt_BR
dc.subjectBed shear stresspt_BR
dc.subjectMobile bedpt_BR
dc.subjectOscillatory flow tunnelpt_BR
dc.subjectAcceleration skewnesspt_BR
dc.subjectVelocity skewnesspt_BR
dc.subjectSand transportpt_BR
dc.titleBed shear stress under skewed and asymmetric oscillatory flowspt_BR
dc.description.magazineCoastal Engineeringpt_BR
Appears in Collections:DHA/NEC - Comunicações a congressos e artigos de revista

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