Numerical Study Of Wave Climb Of Slope Embankment

The climb of the waves on the dike is one of the most important parameters to determine the elevation of the crest of a breakwater and structural form of the breakwater.The determination of the wave climbing is an important task in the feasibility study and design of the revetment and breakwater works.The traditional research method of wave climbing is mainly based on experiments,which simulates wave climbing by wave flume,creating wave by wave maker and constructing slope dykes with different structural plane forms.However,physical experiments will take a lot of manpower,material resources and time.At the same time,the waves used in physical experiments are mostly regular waves and random waves.There are only few experimental studies on nonlinear waves.With the rapid development of computer technology,the use of numerical simulation methods to study wave climbing has gradually become a hotspot in research.Therefore,it is meaningful to establish a reliable and effective numerical wave flume to analyze the wave climbing.In this paper,tracing the free surface based on the k-? turbulence model and the VOF method,making waves by the boundary condition method,and using the sponge layer damping method to eliminating waves.We also create a three-dimensional numerical wave trough and construct a wave climbing model,and the numerical value is used to generate different types of waves and simulate the climb of different types of waves on the mound breakwater,which used to evaluate the accuracy of the wave climbing on different types of protection surfaces and the accuracy of the canonical calculation formula.The main work and conclusions of the thesis are as follows:1.Verify the validity of the numerical wave flume established in this paper by comparing wave surface and spectrum.The results show that the linear wave,stokes wave,elliptic cosine wave,solitary wave and random wave generated by numerical simulation are consistent with the theoretical value of wave,indicating that the numerical wave flume established in this paper has certain accuracy and reliability in wave generation,propagation and wave elimination simulation,which lays a foundation for the following research.2.Based on the numerical wave flume,numerical simulation was carried out on the climbing height of regular waves on smooth slope breakwater and random waves on composite section sea breakwater.The result of comparing with the physical experiment showed that the average relative error of the climbing mathematical model of regular waves and random waves was no more than 10%,which means the model had high accuracy.3.By simulating the climb of the regular wave and random wave with different nonlinear degrees on the slope of the special-shaped prefabricated block revetment slope,the comparison between climb numerical simulation value and physical test and the calculated value of the standard indicated that the calculated value of climb the average relative error of the specialshaped prefabricated block revetment slope is less than 10%,and the numerical simulation results are good,which meets the engineering design accuracy requirements.The numerical water tank established in this paper is suitable for the study of the wave height climbing of smooth slopes and special-shaped prefabricated block revetment slope.4.Numerical simulation of the climb of different nonlinear strength regular waves on the mound breakwater.The comparison between the numerical simulation results and the calculation results of the standard wave climb formula of "Code for Design of Sea Embankment Engineering" shows that in the case of strong nonlinear waves,the stronger the wave nonlinear degree is,the greater the deviation of the code calculation value will be;and in the extremely shallow water range,the deviation of the calculated value of the specification is generally large.The accuracy of wave climbing formula recommended by the code for calculating the wave height of the strong nonlinear wave climbing and the accuracy of wave climbing in extremely shallow water needs to be further defined.According to the “Code for Design of Sea Embankment Engineering” and other regulations,the climbing value of slope embankment with different protective surface structure forms can be calculated by climbing height of smooth slope embankment and roughness coefficient of different protective surface structure forms,and the climbing value of wave on slope embankment with corresponding protective surface structure forms can be obtained.The mathematical model method in this paper can be applied to the determination of the climbing height of slope embankment with different structural forms in practical engineering design.Formulae for wave climbing,such as the “Code for Design of Seawall Engineering Embankment”,should be used cautiously in cases of strong non-linearity or very shallow waves.