Title: <b>89.</b> MODELING THE EFFECT OF WAVE SHAPE ON SEDIMENT TRANSPORT
Abstract: Proceedings of Coastal Dynamics 2009, pp. 1-11 (2009) No AccessMODELING THE EFFECT OF WAVE SHAPE ON SEDIMENT TRANSPORTTom J.J. van den Berg, B.G. Ruessink, and Leo C. van RijnTom J.J. van den BergDepartment of Physical Geography, Faculty of Geosciences, Institute for Marine and Atmospheric Research Utrecht, Utrecht University, P.O. Box 80.115, 3508 TC Utrecht, the Netherlands, B.G. RuessinkDepartment of Physical Geography, Faculty of Geosciences, Institute for Marine and Atmospheric Research Utrecht, Utrecht University, P.O. Box 80.115, 3508 TC Utrecht, the NetherlandsCorresponding author., and Leo C. van RijnDepartment of Physical Geography, Faculty of Geosciences, Institute for Marine and Atmospheric Research Utrecht, Utrecht University, P.O. Box 80.115, 3508 TC Utrecht, the Netherlandshttps://doi.org/10.1142/9789814282475_0091Cited by:0 (Source: Crossref) PreviousNext AboutSectionsView chapterSupplemental MaterialPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack CitationsRecommend to Library ShareShare onFacebookTwitterLinked InRedditEmail View chapterAbstract: The net sediment transport rate beneath waves that possess both velocity and acceleration skewness is explored using a one-dimensional model solving the Reynolds-averaged Navier-Stokes and advection-diffusion equations in conjunction with a k-ε model for turbulence closure. The model is forced with a parameterization of free-stream oscillatory flow in which the degree of velocity versus acceleration skewness, the magnitude of the total wave non-linearity, the oscillatory flow amplitude, and the wave period can be varied. For conditions that the near-bed concentrations are predicted to vary (nearly) in-phase with the oscillatory flow, the resulting transport rates are in the direction of wave advance and are largest under velocity-skewed oscillatory flow that contains some acceleration skewness. When the grain size is less than about 200 µm, however, sediment stirred during a particular wave half-cycle has not completely settled before flow reversal and tends to be transported during the next half-cycle. Consistent with earlier work, these phase-lag effects reduce transport rates under oscillatory flow dominated by velocity skewness (sometimes even leading to transport rates opposing wave advance), while they enhance net transport rates under oscillatory flow dominated by acceleration skewness. When phase-lag effects are important, the largest transport rates are thus found under acceleration-skewed waves. Our work suggests that nearshore sediment transport equations based on the instantaneous bed shear stress may be restricted in applicability to situations when the grain size exceeds about 200 µm. Keywords: sediment transportvelocity skewnessacceleration skewnessnumerical modelingsheet flow FiguresReferencesRelatedDetails Recommended Proceedings of Coastal Dynamics 2009Supplemental MaterialsMetrics History Keywordssediment transportvelocity skewnessacceleration skewnessnumerical modelingsheet flowPDF download
Publication Year: 2009
Publication Date: 2009-07-29
Language: en
Type: article
Indexed In: ['crossref']
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