The performance of two vertical wave screens formed by pipes on the reducing the pressures due to waves on a vertical wall placed on its leeward side has been investigated through an experimental program. The variations in the reflection characteristics of the wall are also studied. Of the two screens the porosity of the seaward side screen was maintained constant, while, the porosity of the one in between this screen and the wall was varied. Thus, four different screen porosity combinations in a random wave field were studied. The effects of the screen porosity on the reflection from the wall and the dynamic pressures on the vertical wall have been reported as a function of relative dissipating chamber width. The details of models, instrumentation, analysis of the data and the results are presented and discussed in this paper. Provision of double chamber screen system with appropriate porosity combination is very effective in reducing the reflection from a vertical wall.

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