Journal
COASTAL ENGINEERING
Volume 56, Issue 3, Pages 363-370Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.coastaleng.2008.11.002
Keywords
Bed morphology; Breakwaters; Deposition; Standing waves; Steady streaming; Turbulence modelling; Waves; Scour
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Funding
- European Commission [EVK3-Cr-2000-00041]
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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. (C) 2008 Elsevier B.V. All rights reserved.
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