Nonlinear four-wave interactions influence the statistical properties of deep-water extreme waves such as a freak wave. However, it is still not clear the characteristics of deep-water generated freak wave shoaling to shallow water region. In this study, the experiments with several bathymetry model are conducted to uni-directional random waves. The maximum wave height increases with an increase in kurtosis by third-order nonlinear interactions in deep water. The dependence of the kurtosis on the freak wave occurrence weaken by second-order nonlinear interactions associated with wave shoaling when the dimensionless depth kh < 1.36.
