Bottom friction and bedload sediment transport caused by boundary layer streaming beneath random waves

Myrhaug, Dag; Holmedal, Lars Erik; Rue, Håvard

doi:10.1016/j.apor.2005.05.001

Cited by 8 publications

(3 citation statements)

References 25 publications

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“…(see e.g. Myrhaug et al, 2004a). The Shields parameter of interest in the present context is obtained by using the results in the Appendix A as (e.g.…”

Section: Shields Parametermentioning

confidence: 99%

Burial and scour of short cylinders under combined random waves and currents including effects of second order wave asymmetry

Myrhaug

Ong

2009

Coastal Engineering

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“…(see e.g. Myrhaug et al, 2004a). The Shields parameter of interest in the present context is obtained by using the results in the Appendix A as (e.g.…”

Section: Shields Parametermentioning

confidence: 99%

Burial and scour of short cylinders under combined random waves and currents including effects of second order wave asymmetry

Myrhaug

Ong

2009

Coastal Engineering

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“…In the interest of brevity, details of the derivation of this expression are not given here. The total bedload transport rate due to both a) and b) above is taken to be that for wave asymmetry alone multiplied by a factor derived from the analysis of Myrhaug et al (2004).…”

Section: Wave-induced Sediment Transportmentioning

confidence: 99%

Lagrangian Model for Simulating the Dispersal of Sand-Sized Particles in Coastal Waters

Soulsby

Mead

Wild

et al. 2011

J. Waterway, Port, Coastal, Ocean Eng.

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A model, SandTrack, has been established to simulate movements of sand-sized particles in coastal waters within a Lagrangian framework. The model can be applied to assess the dispersal of contaminated particulate material, such as may be associated with industrial discharges, or the dispersal of dredged spoil. For such applications, the Lagrangian approach is essential, as the identity of the particles is important. Although Lagrangian models existed previously which could simulate fine sediment constantly in suspension, there are certain applications, such as dealing with the movement of bed particles, in which intermittent physical processes are critical. SandTrack has been tested against field observations from the coastal waters near Dounreay, United Kingdom. The tests strengthened confidence in the model predictions, and enabled appropriate values of some of the model's main physical parameters to be set. Some features of the particle distributions simulated by SandTrack are consistent with field observations, and are not achievable with simpler sediment transport models. The model's run times are sufficiently short for simulations of particle movement in moderately large coastal areas over several decades to be practical.

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“…The pattern of surf zone currents varies with the angle of waves approaching the shore as well as with bathymetric heterogeneities, leading to longshore and rip currents. Sediment is usually carried shoreward during low wave conditions, mainly due to the asymmetry of waves in shallow waters (Myrhaug et al, 2004). The sediment accumulated during these periods may be eroded very rapidly under high wave conditions during a major storm.…”

Section: Introductionmentioning

confidence: 99%

Modelling of sediment transport and morphological evolution under the combined action of waves and currents

Franz¹,

Delpey²,

Brito³

et al. 2017

Preprint

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Abstract. Coastal defence structures are often constructed to prevent beach erosion. However, poorly designed structures may cause serious erosion problems in the downdrift direction. Morphological models are useful tools to predict such impacts and assess the efficiency of defence structures for different scenarios. Nevertheless, morphological modelling is still a topic under intense research effort. The processes simulated by a morphological model depend on model complexity. For instance, undertow currents are neglected in coastal area models (2DH), which is a limitation for simulating the evolution of beach profiles for long periods. Model limitations are generally overcome by predefining invariant equilibrium profiles that are allowed to shift offshore or onshore. A more flexible approach is described in this paper, which can be generalised to 3D models. The present work is based on the coupling of the MOHID modelling system and SWAN wave model. The impacts of different designs of detached breakwaters and groynes were simulated in a schematic beach configuration following a 2DH approach. The results of bathymetry evolution are in agreement with the patterns found in the literature for several existing structures. The model was also tested in a 3D test case to simulate the formation of sandbars by undertow currents. The findings of this work confirmed the applicability of the MOHID modelling system to study sediment transport and morphological changes in coastal zones under the combined action of waves and currents. The same modelling methodology was applied to a coastal zone (Costa da Caparica) located at the mouth of a mesotidal estuary (Tagus Estuary, Portugal) to evaluate the hydrodynamics and sediment transport in calm water conditions and during events of highly energetic waves.

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Bottom friction and bedload sediment transport caused by boundary layer streaming beneath random waves

Cited by 8 publications

References 25 publications

Burial and scour of short cylinders under combined random waves and currents including effects of second order wave asymmetry

Burial and scour of short cylinders under combined random waves and currents including effects of second order wave asymmetry

Lagrangian Model for Simulating the Dispersal of Sand-Sized Particles in Coastal Waters

Modelling of sediment transport and morphological evolution under the combined action of waves and currents

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