This paper summarized recent efforts to predict measured deep water wave kinematics in regular and irregular seas. While the theoretical foundation for prediction of water wave kinematics is sold for regular waves in deep water, no theory presently exits which can consistently predict the kinematics for irregular waves, a problem of major importance for design of deep water offshore structures. A study of nonlinear interaction between a long wave and a short wave riding on the long wave, however, holds considerable promise for bridging this gap between understanding regular wave kinematics and irregular wave kinematics. Recommendations regarding wave kinematics models for engineering purpose are given in the paper.
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