Diffraction of waves past two vertical thin plates on the free surface: A comparison of theory and experiment

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Diffraction of waves past two vertical thin plates on the free surface is studied theoretically and experimentally. A particular attention is paid to the wave motions depending on the relationship between the wavelength (lambda) and the width (b) between the two plates for a given draft (d) and water depth (h). For d/h = 0.19, at resonance modes when b/lambda = 0.245 (first), 0.695 (second), 1.11 (third), 1.55 (fourth), etc., the overall transmission features the maximum with no reflection. In the first mode, the water column between the plates moves up and down with no wave motions. In the second mode, it shows the fundamental standing wave motion. In the remaining modes, it shows another standing wave motions with relatively higher frequencies. As d/h increases (0.1-0.4), the resonance points move to values b/lambda = 0, 0.5, 1, 1.5, etc., and, at those resonance points, the peaks of reflection and transmission coefficients become more sharp and narrow. The loss of energy of incoming waves is also observed at every transmission in the two plate system, and, in particular, more energy loss near a resonant frequency. In addition, it is found that energy is lost mainly due to the transmission process not the reflection process. (C) 2016 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2016-09
Language
English
Article Type
Article
Keywords

WATER-WAVES; BARRIERS; SCATTERING

Citation

OCEAN ENGINEERING, v.124, pp.274 - 286

ISSN
0029-8018
DOI
10.1016/j.oceaneng.2016.07.013
URI
http://hdl.handle.net/10203/213792
Appears in Collection
ME-Journal Papers(저널논문)
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