Author(s): LIU Huan-wen, School of Naval Architecture and Ocean Engineering, Zhejiang Ocean University
Pages: 459-471
Year: 2016 Issue:  5
Journal: Applied Mathematics and Mechanics
Keyword:  sinusoidal sandbar; artificial sandbar; surface wave; reflection coefficient; Bragg resonance;
Abstract: On natural beaches nearly periodic shore-parallel sand ripples and sandbars can be often found in bays or on open coasts.When surface waves coming from the ocean propagate over patches of sand ripples and sandbars,once the Bragg condition is met,that is,the wavelength of surface waves is twice of the sandbar spacings,the Bragg resonant reflection may occur to cause a large portion of the incident wave energy to be reflected back to the ocean.Inspired by the Bragg resonant reflection phenomenon of natural sand ripples and sandbars,some pioneering scientists proposed the socalled Bragg submerged breakwater consisting of a series of small-size,low-height,shore-parallel artificial bars placed just outside the surf zone to shelter the coast and near-shore facilities from the attack of storm waves.A brief summary of the advances in research on Bragg resonance between ocean surface waves and natural sandbars as well as Bragg submerged breakwaters since 1980s was presented.