Title: Mass flux Transported by Breaking Wave Rollers Over Submerged Breakwaters
Abstract: Shore parallel-submerged breakwaters/reefs are increasingly being used to manage coastal erosion without spoiling coastal landscape. The functional design knowledge of such structures and their impacts on wave transmission, currents, sediment processes and shoreline response is however still developing. Laboratory 2D experiments have been carried out in 3 m wide wave flume to investigate wave transmission, wave induced-setup and current over wide submerged breakwater/reef structures. Overtopping flow has a significant role in the generation of currents and beach profile changes in the protected area behind such structures. The experiments using monochromatic waves have been carried out in a central 1m wide channel so as to minimize/prevent return flow over the structure. The model provided by Symonds et al. (1995) is investigated for calculating current passing over the breakwater/reef due to wave breaking. With adjustment to the calibration factors, the model provides reasonable agreement with the experimental data for wide reefs. Analysis of the data into five dimensionless terms reveals their relative influence. Wave-induced current is highly sensitive to crest width and submergence ratio (B/L, h/H) whilst dimensionless overtopping discharge q/√gH13 is seen to have a limiting maximum value with respect to crest width. Results are compared to other models and less extensive but specific data from other sources.
Publication Year: 2005
Publication Date: 2005-01-01
Language: en
Type: article
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