Plane Distribution Characteristics Of Irregular Waves In The Water Area In Front Of A Vertical Wall Numerical Experimental Study

The spatial distribution of wave height in front of a vertical wall refers to the wave height distribution at each spatial position(coordinate)in front of the vertical wall after the wave enters the vertical wall.When the wave propagates to the nearshore,due to the change of terrain and the obstruction of the building,the wave will be refracted,reflected,diffracted and broken.Reflection is the focus of discussion.The actual waves are usually irregular and change in direction.Compared with regular waves,unidirectional irregular waves and multidirectional irregular waves are more in line with the characteristics of natural waves.As an important form of port embankment construction,vertical wall construction is more common in offshore and nearshore engineering layouts.Therefore,in the marine engineering design process of the water area in front of the vertical wall,it is necessary to determine the horizontal distribution characteristics of the vertical wall formed by the external wave action and the vertical wall building.In summary,it is of great significance to study the spatial distribution of irregular waves reflected and superimposed in front of a vertical wall building.In order to accurately describe the spatial distribution of the wave height formed by the wave incident on the vertical wall,this paper constructs a constant-depth wave reflection numerical test pool based on Boussinesq equation to simulate unidirectional irregular waves and different main waves in the water with constant depth in front of the vertical wall.For multi-directional irregular waves with wave directions,the characteristic wave height is obtained through the statistics of the wave surface duration data of the measuring point,the spatial distribution is deeply analyzed,and the position distribution formula of the antinode and the node is given,and then the spectral parameters of different events The relationship between nonlinear parameters and wave height spatial distribution was discussed in depth,mainly including the following aspects:(1)Numerical simulation and accuracy verification of regular wave and irregular wave propagation are carried out in a numerical wave pool with constant water depth.The wave height duration curve is consistent with the theoretical value,and there is no obvious attenuation during the propagation process.Then,the actual terrain with accurate test values of the physical model was selected for modeling,which verified the reliability of the established wave mathematical model under offshore terrain.This model can be applied to the numerical calculation of irregular wave surface distribution characteristics in the water area in front of a vertical wall.Experimental Study.(2)After the unidirectional irregular wave enters the vertical wall,the spatial distribution of the wave height in front of the vertical wall is studied and discussed,which characterizes the irregular wave characteristics in the reflection of the vertical wall.The results show that the general characteristics of the plane space distribution curve of the wave height in front of the vertical wall are:the plane space distribution curve of the wave height in front of the vertical wall reaches the highest point on the straight wall,and it fluctuates continuously with the increase of the distance from the wall,and the trend of this fluctuation is also Increases as the distance from the wall increases.The larger the smaller;the antinodes and nodes are evenly distributed,and the distance between the antinodes or nodes is equal to the characteristic wavelength Lf of the curve;the fourth antinode of the curve and the place farther from the vertical wall can be spatially distributed in front of the vertical wall The curve of is regarded as a straight line,that is,when the distance from the wall reaches a certain value,the specific wave height tends to be HS/HSO=HS/SO≈1.4 in the space;(3)This paper uses the wavelengths corresponding to the four incident wave periods to describe the spatial distance,draws the wave height spatial distribution curve,and compares and analyzes the 4 vertical wall wave height plane spatial distribution curves.The results show that the local water depth wavelength LP corresponding to the incident wave spectral peak period TP is directly related to the plane spatial distribution curve of the vertical wall wave height.The characteristic wavelength of the curve is Lf=1/2LP,when discussing the curve with LP as the incident wavelength,compare the distribution positions of the antinodes and nodes of irregular waves with regular waves.The distribution positions of the antinodes and nodes of the standing wave completely reflected by the vertical wall are the same;(4)According to the fluctuation degree ΔH of the plane spatial distribution curve of the wave height in front of the vertical wall,the correlation is analyzed as 1/(2cosθ)LP.