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Cross-shore variations of wave groupiness by wavelet transform
Authors:Guo-hai Dong  Yu-xiang Ma  Xiao-zhou Ma  
Institution:aState Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116023, PR China
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.
Keywords:Wave breaking  Wave group  Groupiness factor  Continuous wavelet transform  Local wavelet energy density  Surf zone
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