Wave-induced steady streaming, mass transport and net sediment transport in rough turbulent ocean bottom boundary layers

Holmedal, Lars Erik; Myrhaug, Dag

doi:10.1016/j.csr.2009.01.012

Cited by 53 publications

(75 citation statements)

References 24 publications

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“…Yatışkın hale ulaşılamayan veya üç boyutlu akıntıların etkin olduğu durumlarda ise, sonuçları tutarsız olmaktadır. Bu problem üç boyutlu bir model kullanılarak çözümlenebilmektedir [1][2][3][4][5][6][7]. Literatürde doğal veya insan kaynaklı etkenlere bağlı olarak oluşan aşınma problemini tanımlayabilmek amacıyla sediman taşınım modelleri çalışılmakta ve uygulanmaktadır [8][9][10].…”

Section: Gi̇ri̇ş (Introduction)unclassified

Alara, Türkiye denizel alanında sediman taşınımının modellenmesi

Genç¹

2016

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Section: Gi̇ri̇ş (Introduction)unclassified

Alara, Türkiye denizel alanında sediman taşınımının modellenmesi

Genç¹

2016

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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“…A more complete description is given by Holmedal and Myrhaug [12] including a detailed discussion of streaming-generating mechanisms and their physical implications.…”

Section: Introductionmentioning

confidence: 99%

Wave-induced steady streaming and net sediment transport in ocean bottom boundary layers

Holmedal¹,

Myrhaug²

2009

WIT Transactions on Ecology and the Environment

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The sediment transport resulting from the interaction between two important streaming-generating mechanisms has been investigated by numerical simulations of the seabed boundary layer beneath both sinusoidal waves and Stokes second order waves. These two mechanisms are streaming caused by turbulence asymmetry in successive wave half-cycles (beneath asymmetric forcing), and streaming caused by the presence of a vertical wave velocity within the seabed boundary layer.

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“…The mixing length model was also widely employed in early models (Bakker and Van Doorn, 1978;Bijker, 1967;O'Connor and Yoo, 1988;Yang et al, 2006). In the more refined modelling of the BBL, the focus has been put on the turbulence closure, which led to the development of several one-equation models (Davies et al, 1988;Madsen, 1994) and two-equation models (Henderson et al, 2004;Holmedal and Myrhaug, 2009;Kranenburg et al, 2013;Li and Davies, 1996); in particular, the k- model was widely used (Holmedal and Myrhaug, 2009;Kranenburg et al, 2013;). …”

Section: Numerical Simulation For Sediment Transport Under Combined Wmentioning

confidence: 99%

“…Previous work dealing with steady streaming within the ocean BBLs (Deigaard et al, 1999;Holmedal and Myrhaug, 2009;Hsu and Ou, 1994;Trowbridge and Madsen, 1984) …”

Section: Simplification Of the Advection Term (1dv-approach)mentioning

confidence: 99%

“…Intermediate transport models are also empirical transport formulas, but phase-lag effects are included in a parameterized way (Ahmed and Sato, 2003;Camenen and Larson, 2005;Dibajnia and Watanabe, 1992;Dohmen-Janssen et al, 2002). Full unsteady sediment transport models are based on a full time-dependent simulation of both velocities and concentrations during the wave cycle at different elevations above the bed (Fredsøe, 1984;Guizien et al, 2003;Hassan and Ribberink, 2010;Holmedal and Myrhaug, 2006;Holmedal and Myrhaug, 2009;Kranenburg et al, 2013;Ribberink and Al-Salem, 1995;Ruessink et al, 2009;Uittenbogaard et al, 2001). The process-based unsteady models are advanced approaches.…”

Section: Numerical Simulation For Sediment Transport Under Combined Wmentioning

confidence: 99%

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Modelling and Analysis of Fine Sediment Transport in Wave-Current Bottom Boundary Layer

Zuo¹

2018

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Although all care is taken to ensure integrity and the quality of this publication and the information herein, no responsibility is assumed by the publishers, the author nor IHE Delft for any damage to the property or persons as a result of operation or use of this publication and/or the information contained herein. A pdf version of this work will be made available as Open Access via http://repository.tudelft.nl/ihe. This version is licensed under the Creative Commons To my family AbstractThe evolution and utilization of estuarine and coastal regions are greatly restricted by sediment problems. Inspired by the Caofeidian sea area in Bohai Bay, China, this study aims to better understand silty sediment transport under combined action of waves and currents, especially in the wave-current bottom boundary layer (BBL), and to improve our modelling approaches in predicting estuarine and coastal sediment transport.Field observations were carried out in northwestern Caofeidian sea area of Bohai Bay and field data were collected on several other silt-dominated coasts. Analysis shows that silt-dominated sediments are sensitive to flow dynamics: the suspended sediment concentrations (SSCs) increase rapidly under strong flow dynamics (i.e., waves or strong tidal currents which can stir up sediments), and high concentrations cause heavy sudden back siltation in navigation channels. In the following, details of silty sediment transport are studied, focusing on the BBL and high concentration layer (HCL).From laboratory experiments and theoretical analysis, an expression for sediment incipient motion is proposed for silt-sand sediment under combined wave and current conditions. The Shields number was revised by adding the cohesive force and additional static pressure, leading to an extended Shields curve.To study the HCL, a process based 1DV model was developed for flow-sediment dynamics near the bed in combined wave-current conditions. Based on the physical processes, special approaches for sediment movement were introduced, including approaches for different bed forms (rippled bed and 'flat-bed'), hindered settling, stratification effects, mobile bed effects, reference concentration and critical shear stress. The HCL was simulated and sensitivity analysis was carried out by the 1DV model on factors that impact the sediment concentration in the HCL. The results show that the HCL is affected by both flow dynamics and bed forms; the thickness of the HCL is about twice the height of the wave boundary layer; bed forms determine the shape of the concentration profile near the bottom, and flow dynamics determine the magnitude. For finer sediment, stratification effects and mobile bed effects impact the sediment concentration greatly.Finally, based on the 1DV model, the formulations of the mean sediment concentration profile of silty sediments were studied. By solving the time-averaged diffusion equation for SSC and considering the effects of bed forms, stratification and hindered settling, expressions for time-averaged SSC profile...

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Wave-induced steady streaming, mass transport and net sediment transport in rough turbulent ocean bottom boundary layers

Cited by 53 publications

References 24 publications

Alara, Türkiye denizel alanında sediman taşınımının modellenmesi

Alara, Türkiye denizel alanında sediman taşınımının modellenmesi

Wave-induced steady streaming and net sediment transport in ocean bottom boundary layers

Modelling and Analysis of Fine Sediment Transport in Wave-Current Bottom Boundary Layer

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