Abstract
Numerical algorithms are formulated for the prediction of seiche modes (eigen frequencies and mode shapes) in elongated natural basins. Confirmation is provided by an analytical solution for a basin with a linear variation in surface width and a parabolic variation in cross-section. Spatial variations in geometry are shown to have a significant influence on modal frequencies and especially modal shapes. In particular, local modal amplitudes are significantly enhanced by extensive regions of shallower water. Applications are given to the Caspian Sea and the Adriatic Sea.
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