Reflection coefficient of regular waves over wavelike trapezoidal submerged breakwater using non-hydrostatic numerical model

Abstract

SWASH (Simulating WAves till SHore) is a non-hydrostatic numerical model used to investigate the reflection coefficient of three wavelike trapezoidal submerged breakwaters (Structure A, B, and C) in this study. The breakwater was configured in sections of crest and trough; Structure A has its crest and trough section on the sea-bed. Structure B was only a crest section placed on the sea-bed, while Structure C’s crest section is on the sea-bed with its trough section trenching into the sea-bed. Regular wave is propagated over the structures to examine their differences in reflecting wave energy. The result shows that Structure C of the three wavelike trapezoidal submerged breakwaters can effectively reflect more waves while covering less area on the sea-bed. The possibility of a dual peak on the resonant of the reflection coefficient is seen for all the three wavelike trapezoidal submerged breakwaters with a shift in their prominent peak along with the dual peak position. The variation of breakwater height and top widths directly affects the peak value of the reflection coefficient. However, the breakwater height will shift the positioning of the peak values occurrence.