188 / 2024-02-27 11:00:49

Numerical Study on the Hydrodynamic Characteristics of Coastal Freak Wave using on a CIP- based model

wave,coastal zone,numerical simulation model,Hydraulic Characteristics

In this study, the hydrodynamic characteristics of coastal freak wave are numerically investigated. An in-house code, named a constraint interpolation profile (CIP)-based model is employed. The freak wave is generated by the spatial-temporal focusing mechanism in which a number of water waves occurred at a specific point in space and time to produce a large transient wave. First, the accuracy of present model to simulate the nearshore evolution process of coastal freak wave is validated by comparing the previous experimental data. Following, the hydrodynamic characteristics of coastal freak wave under different coastal topography, wave parameters and the occurrence position of freak wave are comprehensively discussed. In the end, the empirical formulas that can quickly predict the breaking and run up of coastal freak wave are summarized. In addition, the differences between coastal freak waves and other waves including regular, irregular and solitary wave are compared. It is found the nearshore run up of freak wave is smaller than that of solitary wave (the range of relative ratio is 0.33-0.5), but larger than that of irregular wave and regular wave (the range of relative ratio is about 1.25 and 3.3), which indicates that the disaster characteristics of coastal freak wave can be evaluated by solitary wave in coastal engineering.