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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/52243

Title: Bragg reflection of water waves due to submerged wavy plate breakwater
Authors: Ching-Yun Yueh
Shih-Hsuan Chuang
Chun-Chiang Wen
Contributors: 國立臺灣海洋大學:河海工程學系
Keywords: Submerged breakwater
Horizontal plate
Wavy plate
Bragg reflection
Dual boundary element method (DBEM)
Date: 2018-04
Issue Date: 2019-06-14T01:52:02Z
Publisher: Journal of Hydro-environment Research
Abstract: Abstract: In this paper, the dual boundary element method (DBEM) is formulated and applied to study the reflection coefficient of a submerged, impermeable, wavy plate breakwater, which is modeled as a thin or non-thickness structure. The concept of the Bragg reflection is adapted to the design of a submerged wavy plate breakwater. The performance is more effective than the other types of horizontal plate breakwaters. In the theory, two-dimensional motion with the wave crests parallel to the submerged wavy plate and the linearized irrotational flow are assumed. The accuracy of the solution obtained using the numerical technique is demonstrated by comparing the numerical values with those obtained from experiments and with other analytical solutions. In addition, the numerical results of wave reflection for both a submerged, impermeable horizontal plate and a wavy plate breakwater are presented and discussed. The results reveal that the wavy plate is a better reflector than the single submerged, horizontal plate breakwater and that the wavy plate breakwater with a relative ripple amplitude is more effective. The numerical results also shows that when choosing a reasonable 2Lr/Lw′ (Lr: the ripple lengths, Lw′: the wavelength of the wave above the submerged plate), the reflection coefficients of the wavy plate can be controlled to approximate the total reflection.
Relation: 21 pp.52-59
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/52243
Appears in Collections:[河海工程學系] 期刊論文

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