LOCALLY CONCENTRATED DAMAGE AT SHIMONIIKAWA COAST, TOYAMA BAY, JAPAN DUE TO GIANT SWELL WAVES
Proceedings of the 32nd International Conference
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Keywords

swell waves
spectral density
nonlinear interactions
Boussinesq-type model
wave-current interaction

How to Cite

Ranasinghe, R. S., Fukase, Y., Sato, S., & Tajima, Y. (2011). LOCALLY CONCENTRATED DAMAGE AT SHIMONIIKAWA COAST, TOYAMA BAY, JAPAN DUE TO GIANT SWELL WAVES. Coastal Engineering Proceedings, 1(32), waves.25. https://doi.org/10.9753/icce.v32.waves.25

Abstract

This paper summarizes results of the preliminary research work, which was completed on identifying and assessing the details of locally concentrated damage along the Shimoniikawa coast, Toyama Bay, Japan due to high swell waves (Yorimawari waves, in Japanese), which occurred on 24th February 2008. A comprehensive analysis has been performed on water surface elevations converted from the total water pressure data, which were obtained at Tanaka observation point from 14th February - 29th February 2008 to investigate the strength of these waves. The spectrum analysis showed a perceptible development of long wave components during this event, which was generated by the nonlinear (secondary) interactions of free waves. Several other mechanisms were also found to be in existence, which were responsible for the high wave overtopping and damage due to concentration of waves at some sites along the Shimoniikawa coast. Furthermore, numerical simulations have been performed to verify the wave transformation and concentration of waves at damaged sites using a model developed based on Nwogu (1993) Boussinesq-type equations.
https://doi.org/10.9753/icce.v32.waves.25
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References

Hamada, T. [1964] "Secondary interactions of surface waves," in Proc. Coastal Engineering, JSCE, 12(1) 12-18.

Ishii, T., Isobe, M., Watanabe, A. [1994] "Improved boundary conditions to a time-dependent mild slope equation for random waves," in Proc. 24th Int. Conf. Coastal Engineering, ASCE, pp. 272-284.

Kennedy, A.B., Chen, Q., Kirby, J.T., Dalrymple, R.A. [2000] "Boussinesq modeling of wave transformation, breaking and run-up, I:1D," Journal of Waterways, Port, Coastal and Ocean Engineering, ASCE, 126 (1), 39-47. http://dx.doi.org/10.1061/(ASCE)0733-950X(2000)126:1(39)

Nwogu, O.J. [1993] "Alternative form of Boussinesq equations for nearshore wave propagation," Journal of waterways, Port, Coastal and Ocean Engineering, ASCE, 119 (6), 618-638. http://dx.doi.org/10.1061/(ASCE)0733-950X(1993)119:6(618)

Nwogu, O.J. [1996] "Numerical prediction of breaking waves and currents with Boussinesq model," in Proc. 25th Int. Conf. Coastal Engineering, ASCE, pp. 31-45.

Ranasinghe, R. S. [2009] "Modelling waves and currents around submerged breakwaters and over complex bathymetries," Doctoral thesis submitted to Department of Civil Eng, The University of Tokyo.

Ranasinghe, R.S., Fukase, Y., Sato, S., Tajima, Y. [2010] "Local concentration of waves due to abrupt alongshore variation of nearshore bathymetry," Coastal Engineering Journal (under review).

Tajima, Y., Sato, S. [2009] "Numerical investigations of locally concentrated damages on Seisho coast due to Typhoon T0709," in Proc. 5th Int. Conf. on Asian and Pacific Coasts, pp. 164-170.

Tick, L.J. [1959] "A non-linear model of gravity I," Journal of Mathematics and Mechanics, 8(5), 643-652.

Nwogu, O.J., Demirbilek, Z. [2001] "BOUSS-2D: A Boussinesq wave model for coastal regions and harbours," ERDC/CHL TR-01-25.

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