Experimental Studies on Wave Transmission of a Permeable Breakwater Constructed by Artificial Blocks
- 1 December 1970
- journal article
- research article
- Published by Taylor & Francis in Coastal Engineering in Japan
- Vol. 13 (1) , 25-29
- https://doi.org/10.1080/05785634.1970.11924107
Abstract
When a breakwater is composed of artificial blocks, waves can pass easily through it. However, wave energy is dissipated and the wave height is decreased by permeation. This paper deals with the transmission rate of wave height, that is the ratio of the transmitted wave height Ht to the incident wave height Hi, and the rate of energy dissipation. It was found by experiments that Ht/Hi depended only upon incident wave steepness for the breakwater of which the crest height above the still water level hc was larger than Hi. However, when hc was smaller than Hi, Ht/Hi depended not only upon the incident wave steepness but also Reynolds number defined by Umax·hc/v, in which U/max was the maximum horizontal velocity at S.W.L. The energy dissipation was expressed as a function of the incident wave steepness, but its expression was different from each other for the above two cases. The Reynolds number had nothing to do with the energy dissipation.Keywords
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