Spectral Description of Energy Dissipation in Breaking Wave Groups

Kaihatu, James M.; Safty, Hoda M. El

doi:10.9753/icce.v32.waves.19

Cited by 3 publications

(4 citation statements)

References 13 publications

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“…A possible explanation for this is that due to the more energetic wave conditions for Case 1 there is stronger grouping of waves for Case 1 than for Case 2. Research by Kaihatu and Safty (2010) shows that wave groups undergo a greater degree of dissipation than equivalent random waves. Thus, for the stronger wave grouping that appears in Case 1 the model must be provided with a stronger dissipation given by a lower value of the parameter gamma, while for Case 2 gamma had to be slightly higher.…”

Section: Wave Modelmentioning

confidence: 99%

Observations and modelling of nearshore sediment sorting processes along a barred beach profile

Broekema

Giardino

Werf

et al. 2016

Coastal Engineering

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Section: Wave Modelmentioning

confidence: 99%

Observations and modelling of nearshore sediment sorting processes along a barred beach profile

Broekema

Giardino

Werf

et al. 2016

Coastal Engineering

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“…A more detailed and robust model for estimating bulk dissipation offers more insight into the nature of energy dissipation. Kaihatu and El Safty (2011) formulated a bulk dissipation mechanism based on a summation of the detailed dissipation rate estimations, as seen below:…”

Section: Bulk Dissipationmentioning

confidence: 99%

“…The resulting frequency dependent dissipation rate can be integrated over the spectrum (Kaihatu and El Safty 2011;hereafter KE11) to derive a bulk dissipation estimate that is comparable to the previously mentioned empirically-based methods but which are instead based on a population of instantaneous dissipation events rather than assumed probability distributions. With suitable adjustment of breaking parameters through comparison to bulk models, the result offers both the proper energy decay rate over the steep reef face and a view of the individual breaking waves.…”

Section: Introductionmentioning

confidence: 99%

Long Wave Effects on Breaking Waves Over Fringing Reefs

Goertz

Kaihatu

Sheremet

et al. 2012

Int. Conf. Coastal. Eng.

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Modeling of wave energy transformation and breaking on fringing reefs is inherently difficult due to their unique topography. Prior methods of determining dissipation are based on empirical data from gently sloping beaches and offer only bulk energy dissipation estimates over the entire spectrum. Methods for deducing a frequency dependent dissipation have been limited to hypothesized linkages between dissipation and wave shape in the surf, and have used bulk dissipation models as a constraint on the overall dissipation for mild sloping beaches. However, there is no clear indication that the constraint on the overall level of dissipation is suitable for the entire reef structure. Using these constraints the frequency dependent dissipation rate can be deduced from laboratory data, taken at the Coastal and Hydraulics Laboratory, of wave transformation over reefs. The frequency dependent dissipation rate can then be integrated over the spectrum to derive an empirically-based counterpart to energy flux dissipation. Comparing the bulk energy dissipation estimates for the reef system to the frequency based method allows for the modification of wave breaking parameters in the frequency estimation, to better estimate total dissipation. Since this method is based on the Fourier transform of the time series data, it allows the dissipation to be found as a function of the frequency. This analysis shows that there is a correlation between the amount of energy in the low frequencies of the wave spectrum and certain characteristics of the frequency dependent dissipation coefficient.

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“…However, this dependence does not hold for wave groups. It was noted that, apparently, wave groups on the whole are subject to dissipation to a greater extent than waves, equivalent in spectral parameters without a group structure [15].…”

Section: Introductionmentioning

confidence: 99%

Wave Energy Dissipation of Spilling and Plunging Breaking Waves in Spectral Models

Saprykina

Aydoğan

Ayat

2022

JMSE

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On the basis of field experiments and modeling, the dependence of the dissipation of the energy of waves breaking by plunging and spilling on the frequency of wave spectra was investigated. It was shown that the modeling of wave breaking should take into account the compensation of the nonlinear growth of higher wave harmonics, which occurs in different ways for waves breaking with different types and for different methods of modeling a nonlinear source term. The study revealed that spilling breaking waves have a frequency selectivity of energy dissipation at frequencies of second and third harmonics for the Boussinesq and SWAN models for any method of modeling a nonlinear source term. Plunging breaking waves have a quadratic dependence of the dissipation coefficient on frequency in the Boussinesq model and SWAN model with the SPB approximation for a nonlinear source term. The SWAN model with default LTA approximation for plunging breaking waves also assumes frequency-selective energy dissipation. The discrepancy between the LTA default method and others can be explained by the overestimation of the contribution of the second nonlinear harmonic and by inaccurate approximation for the biphase. It is possible to improve the accuracy of LTA and SPB methods by tuning SWAN model coefficients.

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Spectral Description of Energy Dissipation in Breaking Wave Groups

Cited by 3 publications

References 13 publications

Observations and modelling of nearshore sediment sorting processes along a barred beach profile

Observations and modelling of nearshore sediment sorting processes along a barred beach profile

Long Wave Effects on Breaking Waves Over Fringing Reefs

Wave Energy Dissipation of Spilling and Plunging Breaking Waves in Spectral Models

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