Study On The Influence Of Slope On Wave Statistical Characteristics

With the development of offshore engineering project,the propagation characteristics of irregular waves in a variety of topography got the attention of many scholars.The slope is the most common topography in offshore engineering.However,there are few studies considering the influence of slope on wave propagation and statistical characteristics.Therefore it is of great significance to understand the influence of slope on wave statistical properties.In this paper,FUNWAVE-1D model based on the Boussinesq equation is used to simulate the irregular wave propagation on two-dimensional slope.According to the existing research of irregular waves propagation on two-dimensional slopes,wave propagation on different slopes are numerically simulated.With the dimensionless analysis,the variation of nonlinear wave parameters along different slopes has been carried out.The results show that skewness will increase with the decrease of water depth,and the change of slope will influence its change rate.Asymmetry will increase and kurtosis will decrease with the increase of the slope when the wave propagation to shallow water,while Ursell parameter does not change significantly with the change of slope.At the same time,the variation of wave height and its distribution are studied for different slopes.The wave height distributions are compared for different slopes.The results show that the probability of high waves will increase when the slope increase,and the empirical formula which can be used to calculate the wave height probability is given by using Weibull distribution and Composite Weibull distribution.The accuracy of the formula is verified by calculating different characteristic wave heights according to the empirical formula.