Studying On Interactions Between Wave And The Double Row Of Trapezoidal Permeable Submerged Breakwater On Complex-type Slop

Submerged is the common wave absorbing structures in coastal engineering and port projects. It is play a very important role in the protection of the coastline as well as the job security from the wave attack. In order to avoid too much sediment into the channel or port ,but also to reduce the quantities of project, also reduce the projects'cost, types of anti-submerged breakwater dike structure more and more applied to engineering practice. Research on the breakwater has been widely expand abroad as well as in the country and also achieved some results, however , because there are many types of submerged, we need the help of physical model test in many cases in the actual project, especially in the wave propagation and breaking in the Submerged breakwater, further studies are still necessary. Moreover, a lot of research is based on the physical model, study the deformation of the wave,obtained Wave height transmission coefficients empirical formula or chart by fitting testing data; And some directly derived Transmission coefficients of the theoretical wave height based on the wave theory. Therefore, research on submerged breakwater, should pay more attention to the physical model test and numerical models combined.Based on the slope gradient of 1:35 on the double wave flume tests, study the wave absorbing characteristics, fragmentation patterns and wave height changes along the slope bed surface when the linear wave and cnoidal wave pass through the trapezoidal permeable submerged breakwater which is set on the bed surface of slope. Using Goda's two-point method depart test data from the height of the incident wave and the reflected wave height in front of the submerged breakwater, and the transmission wave height after the submerged breakwater. Discuss the wave properties of submerged breakwater through by seeking the appropriate reflection coefficient, transmission coefficient. May affect the double-ladder against permeable submerged breakwater wave properties of the various factors,in this paper, we investigate the relative crest depth R/H, porosity K△, wave steepness H/L, Relative wave height H/h effect the transmission coefficient and reflection coefficient of the double trapezoidal permeable submerged breakwater, a comparative analysis of wave effects, and model the performance of wave factors analyzed in further. Meanwhile, established two-dimensional mathematical model of wave successfully in this paper, based on the VARANS equation, we use the VOF method to track the free surface of wave to simulate the interaction between the Linear wave as well as conidal wave and the double-ladder against permeable submerged breakwater on the surface of the slop. Validate is correct by compared the numerical results and experimental data. At last use this two-dimensional mathematical model to analyze the flow field of the nearby Permeable submerged breakwater also within the submerged breakwater, vortex and turbulence kinetic energy and other characteristics near the submerged breakwater.