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UBC Theses and Dissertations

Seiche excitation in a coastal bay by edge waves travelling on the continental shelf Lemon, David Douglas


Short period ( <1 hour ) oscillations are often seen superimposed on tidal curves at Port Renfrew, B.C. In order to determine the nature of these oscillations, time-series of sea-level variation were obtained in Port San Juan; their analysis revealed energy peaks at periods of 34.7 min. and 13.5 min. A theoretical model of wave excitation of a basin of variable depth fitted to Port San Juan by edge waves travelling on the shelf accounts reasonably for the observed frequencies. Bottom friction was taken into account to investigate the dependence of seiche amplitude on the amplitude of the shelf waves.

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