Kinematics of nonlinear random waves near free surface

Document Type

Article

Date of Original Version

1-1-1992

Abstract

In recent years, considerable research effort has been devoted to improving the accuracy of the assessment of wave kinematics near the ocean surface. After obtaining accurate predictions for wave kinematics, to calculate the wave kinematics acting on a cylinder for points in the vicinity of the still-water level, one needs to further consider the intermittency effect due to the fluctuations of the free surface. Using a second-order random wave theory and taking account of the intermittency effect, the present study analytically calculates the first four moments of wave velocity and wave acceleration. A major improvement of the present study over earlier works is that the bandwidth of wave spectrum can be arbitrary. Numerical studies are conducted for both linear and nonlinear random waves, in which the wave spectrum is characterized by a Pierson-Moskowitz (P-M) formulation. It is found that linear and nonlinear solutions are noticeably different. © ASCE.

Publication Title, e.g., Journal

Journal of Engineering Mechanics

Volume

118

Issue

10

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