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MODEL STUDIES OF LONG WAVE AMPLIFICATION BY CIRCULAR ISLANDS AND SUBMARINE SEAMOUNTS.
HAWAII INST OF GEOPHYSICS HONOLULU
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The amplification of periodic gravity waves around circular cylinders, around model islands composed of a seamount base and a cylindrical cap, and over submerged seamounts was studied in a ripple tank. Theoretical predictions of long-wave amplification by circular cylinders and by islands were verified for a limited range of frequencies. Tests on seamounts with peaks submerged to about 12 percent of the undisturbed water depth showed that particular waves are more sharply focused than others over the peak. For a conical seamount this occurred at a wave length of pi2 times its base diameter, and for the parabolic seamount, at a wave length of pi1.7 times its base diameter. The amplification factors for these two cases are 2.1 and 3.5, respectively. Theoretical predictions for the longest wave sharply focused by the conical seamount agree with the experimental results. Predicted amplitudes, however, are generally smaller and not in agreement with experimental results. Author
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