CGRG Bibliography of Canadian Geomorphology
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Author : Dharma, S.; and Hall, K.
Date : 2003.
Title : Diffraction effect on wave transmission at submerged breakwaters.
Publication : Abstracts - Canadian Coastal Conference 2003. Queen’s University. Kingston, Ontario, Canada. 15-17 October 2003.
Issue :
Page(s) :
Abstract
Submerged rubblemound breakwaters can be used to protect a beach from wave action. Structures with a wide crest can be built parallel to the shoreline and the crest can be set below the water level. The primary function of these structures is to protect coastal areas from wave action by reducing the incoming waves or by acting as a barrier to the waves. These structures are usually desirable in situations where only partial attenuation of the incoming waves is desirable. A study of wave transmission processes at submerged breakwaters was undertaken in the wave basin at Queen's University Coastal Engineering Research Laboratory, Kingston, Ontario, Canada. The basin is approximately 30m x 35m x 1.2m and is equipped with a wave generator that is capable of generating regular and irregular waves. A number of wide crested structures were tested under a wide range of design conditions. The interaction of waves and the structure in a 3-D mode is more complex than in a 2-D model. The complex, three dimensional wave-structure interactions include diffraction of the wave passing by the tip of the structure. The results show that relative crest height, relative wave height and crest width of the structure are the most important parameters. A model to predict transmission was developed using statistical analysis methods. The wave transmission includes parameters that are considered to be representing physical processes such as water depth fluctuation; hence it is related to wave breaking, wave overtopping, dissipation due to surface friction, and transmission through the breakwater. The effect of diffraction is also represented.
Bibliography of Canadian Geomorphology