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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/43271

Title: Harmonic decomposition by HHT on regular waves propagating over a rectangular submerged obstacle upon a fluidized bed
Authors: Yung-Lung Chen;Shiaw-Yih Tzang;Shan-Hwei Ou
Contributors: 國立臺灣海洋大學:河海工程學系
Keywords: harmonic;wave decay;HHT;submerged obstacle;fluidized bed
Date: 2011
Issue Date: 2017-06-15T01:20:43Z
Publisher: Journal of Marine Science and Technology
Abstract: Abstract:The experimental measurements of surface waves over a submerged rectangular obstacle upon a sandy bed reported by Tzang et al. (2008) have further been analyzed in detail by Hilbert-Huang transform (HHT). The harmonic components of regular waves at 5 sites in the vicinity of the obstacle are decomposed into the intrinsic mode functions (IMFs) by the ensemble empirical mode decomposition (EEMD) with postprocessing scheme using masking signal EMD (MSEMD). The results of Hilbert spectrum of waves derived by the HHT illustrate that considerable decay of harmonic amplitude occurs at all 5 sites when the sandy bed have been fluidized but is not observed in any of the unfluidized tests. Much more reductions of amplitude due to the fluidization response are found in the fundamental harmonic particularly during the building-up of excess pore pressure than in higher harmonics.
Relation: 19(6), pp.514-524
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/43271
Appears in Collections:[河海工程學系] 期刊論文

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