A Numerical Study on Asymmetries of Obliquely Incident Waves over a Slope Bottom

摘要

Skewness and asymmetry of waves are always used to describe the shape of waves and quantify nonlinearity. Parameterization of skewness and asymmetry of random waves is an efficient way to describe the wave transformation process in shallow water. However, the previous studies mainly concentrated on conditions that waves are perpendicularly propagating to shorelines, neglecting the influence of incident angles. The well-known numerical model, FUNWAVE2D, was adopted to simulate obliquely incident random waves propagating over a beach with slope 1:30. It was found that the incident angles have significant influence on the evolution of asymmetries of waves. Additionally, empirical formulae were derived to reflect the relationship between the asymmetry parameters and the local Ursell number, combining the incident angle influence.