Author(s)

A. C. Neves, F. Veloso Gomes & F. Taveira Pinto

Abstract

The use of submerged breakwaters against coastal erosion problems has some advantages when compared, for example, with the use of similar emerged coastal protection structures and for that reason their use in coastal protection is becoming popular all over the world. Their effect in the wave field and especially in the wave-induced velocities has been analysed by several authors though there is still a lack of knowledge on the wave-flow interaction. The aim of this study was to analyse the behaviour of submerged breakwaters and especially the wave induced velocity field, which can have great impact in the stability of the structures and in the sediment circulation. Two-dimensional scaled physical tests were carried out in the Hydraulics Laboratory wave tank of the University of Porto, in order to understand with more accuracy the influence of the permeability and of the submergence of the breakwaters in the wave-structure interaction. For that reason, tests were performed with the same wave conditions (regular waves), with two different models with the same geometry, one with permeable and one with impermeable rough slopes, and with two water depths (leading to two different freeboards of the structure). Keywords: submerged breakwater, wave-flow interaction. 1 Introduction Several investigations have been performed in relation to submerged breakwaters. Although much is already known in what concerns to the stability of these structures, it is believed that there is a lack of information about the hydrodynamics in their vicinity, namely in the velocity field.

Keywords

submerged breakwater, wave-flow interaction.