孤立的非対称波の一波形表現

概要

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Characteristics of waves on the sea are usually expressed by the wave height H and the wave length W_L. And the steepness of waves is traditionally represented by the quotient H/W_L. But, these wave factors are not enough to express real wave characteristics, and are not enough to consider wave excitation forces acting on floating structures. Because the shape of waves are generally asymmetric, and extreme waves which cause marine accidents may be clearly asymmetric. In this paper, in order to standardize the wave form of asymmetric waves it is attempted to describe this wave form simply and mathematically by using a deformation function and regular waves, such as the sinusoidal wave, the trochoidal wave and the Stoke's wave. The deformation function f_d is defined to be f_d=A・exp(B(η-A_0)), where A and B are deformation factors, η is the wave surface elevation and A_0 is the wave amplitude H/2. It is confirmed that the described wave forms are in good agreement with geometric characteristics of extreme waves measured in the ocean and with a numerically calculated wave form.
社団法人日本航海学会の論文
1995-03-25