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Indexed by:期刊论文

Date of Publication:2008-05-01

Journal:OCEAN ENGINEERING

Included Journals:SCIE、EI

Volume:35

Issue:7

Page Number:676-684

ISSN No.:0029-8018

Key Words:wave breaking; wave group; groupiness factor; continuous wavelet transform; local wavelet energy density; surf zone

Abstract:This paper proposes a new definition of groupiness factor (GF) based on the local wavelet energy density of the wave time series to describe the groupiness degree of waves. The main advantage of this new GF is that the effect of the operational definition on it is smaller than that on SIWEH-based GF or envelop-based GF. Then, the new GF is used to study the groupiness variations of mechanically generated irregular waves in a wave flume propagating on a slope of 1:45. The results of present study show that the decrease of groupiness in the coast is triggered by breaking. And energy distribution along the record time for the first harmonics of waves in the surf zone, which becomes more uniform than that out the surf zone, is the main reason causing the decrease of groupiness. (C) 2008 Published by Elsevier Ltd.