WAVE INTERACTIONS WITH SUBMERGED HORIZONTAL FLEXIBLE BREAKWATERS

With the ongoing sea-level rise associated with climate changes, coastline protection is among the top priorities of national interest for many countries across the globe, and particularly those in Southeast Asia with extended shorelines, and submerged horizontal plate breakwaters (SHPB) have been proposed as a possible measure for shoreline protection in the literature. Most of the earlier research works considers the material for the SHPB to be either rigid or elastic sheets (with and without perforations) (Patarapanich, 1984, Heins 1950). The wave modulation due to the presence of such structures is thus predominantly due to wave interactions, edge reflection and turbulence. In this paper, we extend the earlier works and consider the viscoelastic properties for the flexible SHPB (which can better represent the possible damping introduced in the field conditions) both experimentally and analytically.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/l92umh2KnYY

An Experimental Investigation of Wave Forces on a Submerged Horizontal Plate over a Simple Slope

We experimentally investigated the forces induced by monochromatic and solitary waves on a submerged horizontal plate in a wave flume. The experimental results of two-dimensional wave forces on the plate over a 1:10 simple slope and a flat bottom are presented. The effects of the uneven bottom on wave loads are discussed by comparing the results with those in a constant water depth. The measured nonlinear wave forces exhibited considerable discrepancies with the theoretical results from the linear wave theory. The wave forces on the plate induced by monochromatic waves over the simple slope in intermediate water showed no appreciable difference with the flat-bottom results. The solitary wave forces in terms of the downward vertical force and overturning moment significantly decreased in the existence of the simple slope. Furthermore, the dependency of the wave length, wave height and the submergence depth on the wave loads is also discussed.