Sediment transport due to veering of mean velocity in seabed boundary layer in coastal areas

Monday 29 june 2015

17:45 - 17:48h at Mississippi (level 1)

Themes: (T) Sediment management and morphodynamics, (ST) Sediment transport mechanisms and modelling, Poster pitches

Parallel session: Poster pitch: 3A. Sediment - Erosion

Effect on sediment transport due to veering of mean velocity in the seabed boundary layer has been investigated using numerical simulations. The effect on veering and hence the sediment transport pattern due to varying angle between the waves and current and variation of bottom roughness is presented.The flow results from an interaction between the classical wave-current seabed interaction and the veering of mean velocity. Thus the classical wave-current interaction is responsible for the reduction of the mean velocity relative to current alone, while the veering causes the mean flow to retard more in the direction in which the current and the waves complement each other than when they oppose each other. The mean Eulerian velocities co-directional and perpendicular to the current, respectively, are presented. The resulting sediment dynamics have been investigated and results for both suspended load and bedload are presented. There is no veering effect for 0 and 90 degrees between the waves and the current due to the symmetrical nature of the problem. It appears that the net transport of suspended sediments and bedload depend upon the angle between the waves and current. For wave-dominated situations the net sediment transport is also affected by the veering.

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