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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/npg-2017-35
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
01 Aug 2017
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Nonlinear Processes in Geophysics (NPG).
Laboratory and numerical experiments on stem waves due to monochromatic waves along a vertical wall
Sung Bum Yoon1, Jong In Lee2, Young Taek Kim3, and Choong Hun Shin1 1Department of Civil and Environmental Engineering, Hanyang University, EIRCA Campus, Ansan, Gyeonggi, 15588, South Korea
2Department of Marine and Civil Engineering, Chonnam National University, Yeosu Campus, Yeosu, Jeonnam, 59626, South Korea
3River and C oastal Research Division, Korea Institute of Civil Engineering & Building Technology, Goyang, Gyeonggi, 10223, South Korea
Abstract. In this study, both laboratory and numerical experiments are conducted to investigate stem waves propagating along a vertical wall developed by the incidence of monochromatic waves. The results show the following features: For small amplitude waves, the wave heights along the wall show a slowly varying undulation. Normalized wave heights perpendicular to the wall show a standing wave pattern. Thus, overall wave pattern in the case of small amplitude waves show a typical diffraction pattern around a semi-infinite thin breakwater. As the amplitude of incident waves increases, both the undulation intensity and the asymptotic normalized wave height decrease along the wall. For larger amplitude waves with smaller angle of incidence, the measured data show clearly stem waves. Numerical simulation results are in good agreement with the results of laboratory experiments. It is found from a simple geometric relationship of wave pattern that the lengthening of wave length due to the nonlinearity of waves is responsible for the development of stem waves along the wall. The existence and the properties of stem waves for sinusoidal waves found theoretically based on numerical simulations are fully supported by the physical experiments conducted in this study.

Citation: Yoon, S. B., Lee, J. I., Kim, Y. T., and Shin, C. H.: Laboratory and numerical experiments on stem waves due to monochromatic waves along a vertical wall, Nonlin. Processes Geophys. Discuss., https://doi.org/10.5194/npg-2017-35, in review, 2017.
Sung Bum Yoon et al.
Sung Bum Yoon et al.
Sung Bum Yoon et al.

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Short summary
· Laboratory and numerical experiments are conducted to investigate stem waves due to incidence of monochromatic waves. · For larger amplitude waves with smaller angle of incidence, the measured data show clearly stem waves. · Increase of wave length due to nonlinearity is responsible for the development of stem waves. · Existence and properties of stem waves found theoretically are fully supported by the physical experiments.
· Laboratory and numerical experiments are conducted to investigate stem waves due to incidence...
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