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Indexed by:Journal Papers

Date of Publication:2015-09-15

Journal:OCEAN ENGINEERING

Included Journals:SCIE、EI、Scopus

Volume:106

Page Number:415-423

ISSN No.:0029-8018

Key Words:Mild slope; Barred beach; Bimodal feature; Second peak; POM model; Wave roller

Abstract:A detailed description is given of the results of laboratory experiments on bimodal velocity profile of longshore currents over two mild-slope barred beaches. The objective is to examine the bimodal longshore current velocity profile for purely wave-driven currents, with emphasis on the second peak and ratio of two peaks. The research focus is on the locations, values and ratios of two velocity peaks for the cases of mild slope beaches. The dependence of its bimodal feature on wave height, wave period and beach slope on the longshore currents are discussed. The 2-D model based on vertically integrated equations (external mode) of Nearshore POM was performed to compute the measured velocity profile. The depth-varying wave-induced residual momentum, the surface rollers, and the lateral mixing the bottom friction are considered, and the effects of lateral mixing, surface rollers and bottom friction on numerical model are discussed. (C) 2015 Elsevier Ltd. All rights reserved.