National Oceanic and
Atmospheric Administration
United States Department of Commerce


 

FY 1980

Normal modes of oscillation in relation to storm surge and tsunami in Osaka Bay, Japan (2)

Nakamura, S., and H.G. Loomis

La Mer, 18(2), 28–33 (1980)


Normal modes of oscillation in the area including Osaka Bay and Kii Channel were studied numerically by using Loomis' method for determining normal modes of irregular bodies of water with variable depth. The lowest four modes are 7.34, 3.43, 2.97 and 2.51 hours respectively, and those modes are illustrated to show their patterns of wave height distribution in the area. Any one of these modes might appear if an incident disturbance has an approximately same period to that of the mode, especially in case of a landfall storm inducing a storm surge in the area of Kii Channel and Osaka Bay. Adding to the above, a possible mode, which might be produced by an incident tsunami, is also considered in order to have an understanding of the period at the peak of the tsunami spectra at Osaka.



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