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Fixed absorbing semi-immersed breakwater
AbstractExperiments have been performed in a wave flume to analyse the interaction between regular gravity waves and a fixed absorbing semi-immersed breakwater. This breakwater is an improved design of a semi-immersed structure, equipped with impermeable walls at the two ends, by addition of an absorbing caisson at the seaside end of the structure in order to reduce the reflection. A comparison between the two types of breakwater is proposed. The experiments exhibit the great efficiency of such an absorbing breakwater on the reflection characteristics. It is clearly shown that the absorbing caisson also has a profitable effect on the transmission coefficient. The effects of both the immersion and the width of the structure are examined. For the absorbing breakwater it is demonstrated that an increase in the immersion is more efficient than an increase in the width of the structure for both reflection and transmission coefficients. The analysis of the results gives information to choose the dimensions of the absorbing caisson in relation to the wave characteristics. The accurate determination of the higher harmonics travelling in the wave flume is used to analyse the nonlinear behaviour of the interaction between the waves and the structure. The results exhibit a reflected second harmonic with a very large amplitude correlated to the evolution of the reflection coefficient as a function of the relative water depth.
Fixed absorbing semi-immersed breakwater
AbstractExperiments have been performed in a wave flume to analyse the interaction between regular gravity waves and a fixed absorbing semi-immersed breakwater. This breakwater is an improved design of a semi-immersed structure, equipped with impermeable walls at the two ends, by addition of an absorbing caisson at the seaside end of the structure in order to reduce the reflection. A comparison between the two types of breakwater is proposed. The experiments exhibit the great efficiency of such an absorbing breakwater on the reflection characteristics. It is clearly shown that the absorbing caisson also has a profitable effect on the transmission coefficient. The effects of both the immersion and the width of the structure are examined. For the absorbing breakwater it is demonstrated that an increase in the immersion is more efficient than an increase in the width of the structure for both reflection and transmission coefficients. The analysis of the results gives information to choose the dimensions of the absorbing caisson in relation to the wave characteristics. The accurate determination of the higher harmonics travelling in the wave flume is used to analyse the nonlinear behaviour of the interaction between the waves and the structure. The results exhibit a reflected second harmonic with a very large amplitude correlated to the evolution of the reflection coefficient as a function of the relative water depth.
Fixed absorbing semi-immersed breakwater
Brossard, J. (author) / Jarno-Druaux, A. (author) / Marin, F. (author) / Tabet-Aoul, E.H. (author)
Coastal Engineering ; 49 ; 25-41
2003-05-22
17 pages
Article (Journal)
Electronic Resource
English
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