Calculation of Irregular Wave Reflection From Perforated-Wall Caisson Breakwaters Using a Regular Wave Model

Suh, Kyung Duck; Son, Sang Young; Lee, Jong In; Lee, Tae Hwan

doi:10.1142/9789812791306_0144

Cited by 5 publications

(9 citation statements)

References 13 publications

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“…Both used only regular waves. Recently, on the other hand, Suh et al (2002) compared the regular wave approximation and spectral wave approximation to compute the reflection of irregular waves from a perforated-wall caisson breakwater. They concluded that the spectral wave approximation is more adequate but the root-mean-squared wave height should be used for all the component waves to compute the energy dissipation at the perforated wall.…”

Section: Introductionmentioning

confidence: 99%

Wave reflection from partially perforated-wall caisson breakwater

Suh

Park²,

Park

2006

Ocean Engineering

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In 1995, Suh and Park developed a numerical model that computes the reflection of regular waves from a fully-perforated-wall caisson breakwater. This paper describes how to apply this model to a partially-perforated-wall caisson and irregular waves. To examine the performance of the model, existing experimental data are used for regular waves, while a laboratory experiment is conducted in this study for irregular waves. The numerical model based on a linear wave theory tends to over-predict the reflection coefficient of regular waves as the wave nonlinearity increases, but such an over-prediction is not observed in the case of irregular waves. For both regular and irregular waves, the numerical model slightly over-and under-predicts the reflection coefficients at larger and smaller values, respectively, because the model neglects the evanescent waves near the breakwater.

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Section: Introductionmentioning

confidence: 99%

Wave reflection from partially perforated-wall caisson breakwater

Suh

Park²,

Park

2006

Ocean Engineering

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“…Therefore, the real part of G" corresponds to the resistance of the barrier, and the imaginary part of G" is associated with the phase differences between the velocity and the pressure because of inertial effects. Suh et al (2002) showed that the jet length I is related to the blockage coefficient C by:…”

Section: Velocity Potential and Boundary Conditionsmentioning

confidence: 99%

“…Park et al (2000) applied the method of Mei, Liu, and Ippen (1974) to develop an analytical model that can predict the scattering of irregular waves from a slotted barrier. Cox (2005, 2006) developed the method and trend of Isaacson, Premasiri, and Yang (1998) and applied the procedure of Kim (1998) and Suh et al (2002) to calculate the main parameters of the permeability parameter. Sun, Jung, and Pyun (2007), by adoption of the method proposed by Isaacson, Premasiri, and Yang (1998), computed hydrodynamic characteristics of curtain-wall pile breakwaters.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Model for Hydrodynamic Behavior of an Array of Vertical Cylindrical Piles Used as a Breakwater

Nejadkazem

Gharabaghi

2012

Journal of Coastal Research

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I www.JCRonline.org Nejadkazem, 0. and Gharahaghi, A.R.M., 2012. Mathematical model for hydrodynamic behavior of an array of vertical cylindrical piles used as a breakwater.A mathematical model is developed to study hydrodynamic behavior of an array of vertical cylindrical piles used as a breakwater (VPB) under irregular waves that impinge normally. The numerical calculation is based on an eigenfunction method and utilizes matched asymptotic boundary conditions. The concept of energy spectra has been used for modeling real hydrodynamic sea wave characteristics, and evanescent modes were considered for each wave component. A new empirical formula for estimation of the contraction coefficient is proposed that includes hydrodynamic wave characteristics in addition to the geometry of a breakwater. The formula models effects of hoth vena contracta and nonpropagating waves and is advantageous from the prospect of effectiveness and efficiency. Consequently, few evanescent terms are necessary for the eigenfunction expansion method to be confident about the accuracy of results. Results are given for reflection, transmission, and dissipation, and the theoretical value was found to agree quite well with experimental data available in literature. It is concluded that an efficient range of porosity may be located in [0.1, 0.2], and the steeper wave reflects more and transmits less. Also, in shallow and intermediate water depth, the VPB operates optimally and dissipates the energy of waves effectively. The VPB is recommended for significant wave periods of more than 2.0 seconds and performs better for a wave steepness of less than 0.025.

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“…(7), ' is the length of the jet flowing through the slot and represents the inertial resistance at the barrier. Suh et al (2002) showed that the jet length ' is related to the blockage coefficient C by Flagg and Newman (1971) proposed the blockage coefficient as…”

Section: Derivation Of Kim (1998) Solutionmentioning

confidence: 99%