| Title: | EXPERIMENTAL VERIFICATION OF THE RELATIVE TROUGH FROUDE NUMBER (RTFN) METHOD FOR WAVE BREAKING IN BOUSSINESQ MODELS |
| DOI No: | 10.1142/9789812701916_0027 |
| Source: | COASTAL ENGINEERING 2004 (pp 357-369)
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| Author(s): | TAKASHI OKAMOTO
Coastal Engineering Centre, Old Dominion University, Norfolk, VA 23508, USA
DAVID R. BASCO
Coastal Engineering Centre, Old Dominion University, Norfolk, VA, 23508, USA
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| Abstract: | The Relative Trough Froude Number (RTFN) theory is a new wave breaking criteria introduced by Utku (1999). Theoretical analysis for the critical condition of wave breaking initiation is performed with non-linear wave theories both for deep and shallow water. A least square, cross-correlation method (Misra et al., 2003) is employed for the calculation of wave celerity in a numerical model of Boussinesq type. Wave breaking initiation locations are compared between the numerical model and wave tank experiments. From the analysis, the critical condition of wave breaking initiation, 1.45, is valid even with non-linear wave properties. Wave breaking termination in the trough region is also important for nearshore hydrodynamics. The termination condition of wave breaking is calculated by using a stable wave height condition after breaking reported by Horikawa and Kuo (1966). Wave tank experiments are conducted to confirm the critical condition and it is found that the experimental data shows strong evidence that the critical condition of the wave breaking termination is about 1.15, which is very close to the theoretical value. |
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