Open AccessRESONANCES OF COASTAL WATERS BETWEEN PERTH AND GERALDTON (WESTERN AUSTRALIA)
Author(s) -
H. Allison,
A. Grassia,
R. Litchfield
Publication year - 1980
Publication title -
proceedings of conference on coastal engineering/proceedings of ... conference on coastal engineering
Language(s) - English
Resource type - Journals
eISSN - 2156-1028
pISSN - 0589-087X
DOI - 10.9753/icce.v17.16
Subject(s) - shore , resonance (particle physics) , reef , amplitude , oceanography , range (aeronautics) , structural basin , geology , physics , geomorphology , materials science , optics , particle physics , composite material
Sea-level oscillations along the Western Australian coast, with periods in the range of 20-40 mins, have considerably greater amplitudes between Perth and Geraldton than at other locations along the coastline. It is shown that amplification of these oscillations is due to resonance in the near shore basin formed by the shore and a submerged reef-chain parallel to and 5 km from the shore. The rigorous analytical solution for the resonance frequencies is obtained for the two-dimensional hydrodynamic model. Comparison with results from spectral analysis of recorded oscillations indicates a satisfactorily agreement with the theory. Statistical estimation of damping of the observed oscillations indicates that the predominant resonance in the first mode is sharp, having the quality factor Q=10.