TY - JOUR

T1 - Flow under standing waves Part 2. Scour and deposition in front of breakwaters

A1 - Gislason,Kjartan

A1 - Fredsøe,Jørgen

A1 - Sumer,B. Mutlu

AU - Gislason,Kjartan

AU - Fredsøe,Jørgen

AU - Sumer,B. Mutlu

PB - Elsevier BV

PY - 2009

Y1 - 2009

N2 - A 3-D general purpose Navier-Stokes solver was used to calculate the 2-D flow in front of the breakwater. The k-omega, SST (shear-stress transport) model was selected as the turbulence model. The morphologic model of the present code couples the flow solution with a sediment transport description and routines for, updating the computational mesh based on the mass balance of sediment. Laboratory experiments of scour also were conducted in a wave flume to obtain data for model verification. Both in the numerical simulations and in the laboratory experiment, two kinds of breakwaters were used: A vertical-wall breakwater; and a sloping-wall breakwater (Slope: 1:1.5). Numerically obtained scour-deposition profiles were compared with the experiments. The numerical results show that the equilibrium scour depth normalized by the wave height decreases with increasing water-depth-to-wave-length ratio. Although the numerical results obtained for vertical-wall breakwaters are consistent with the existing experimental data (including the present experiment), the numerical results for the sloping-wall case appear to be not very satisfactory.

AB - A 3-D general purpose Navier-Stokes solver was used to calculate the 2-D flow in front of the breakwater. The k-omega, SST (shear-stress transport) model was selected as the turbulence model. The morphologic model of the present code couples the flow solution with a sediment transport description and routines for, updating the computational mesh based on the mass balance of sediment. Laboratory experiments of scour also were conducted in a wave flume to obtain data for model verification. Both in the numerical simulations and in the laboratory experiment, two kinds of breakwaters were used: A vertical-wall breakwater; and a sloping-wall breakwater (Slope: 1:1.5). Numerically obtained scour-deposition profiles were compared with the experiments. The numerical results show that the equilibrium scour depth normalized by the wave height decreases with increasing water-depth-to-wave-length ratio. Although the numerical results obtained for vertical-wall breakwaters are consistent with the existing experimental data (including the present experiment), the numerical results for the sloping-wall case appear to be not very satisfactory.

KW - Breakwaters

KW - Steady streaming

KW - Standing waves

KW - Scour

KW - Deposition

KW - Bed morphology

KW - Waves

KW - Turbulence modelling

U2 - 10.1016/j.coastaleng.2008.11.002

DO - 10.1016/j.coastaleng.2008.11.002

JO - Coastal Engineering

JF - Coastal Engineering

SN - 0378-3839

IS - 3

VL - 56

SP - 363

EP - 370

ER -