Numerical Simulation Study On The Formation And The Propagation Characteristics Of Landslide-generated Waves In The Different Reservoir Section

In the last years,with the continuous construction of giant hydraulic and hydro-power projects,the construction of the dam project is also increasing.Most giant hydraulic and hydro-power projects are being,built in the mountain valley,the complex geological structure and some of the activity intensity area.Most of them are under the threat slope instability and landslide.Then,studying the landslide surge problem especially the swell and propagation law for landslide surge disasters prevention and related engineering consrtruction has important theoretical significance and practical value.There are many influencing factors of landslide surge,and the present study is inadequate.In this paper,it is through three-dimensional numerical simulation to study two kinds of reservoir section(V and U)and contain cormer cases of landslide surge problem,and establish these two section of numerical model so as to analysis the two sections of initial surge height,on the other side of the climb height,propagation characteristices and rule of attenuation speed.It aimed to explore the influence of the factors of landslide surge propagation characteristics of area.The main research contents are as follow’s:(1)This paper has carried on the induction summary of the existing empirical formula method analysis,and the numerical calculation compare of the model.We get that Pan Jiazheng method has a high accuracy when calculating the surge waves.It has extensive applicability similar to actual simulated results.(2)The study indicate the largest initial surge height characteristics of landslide surge.The U shape of the cross section of the wave height is higher than V in the same slider same speed into the water.And the height of initial wave and second wave is nearly same.The height ofspreading to the other side is heigher than the wave upward and downstream propagation height in the V shape cross section area.And it is opposite that the U shaped cross section area.It is obvious that the climb height of V shaped cross section of the surge reached the other side,and the climb is higher.The climb height of the U shape cross section is very small.The range is larger that the climb height to the erosion on both sides of the curve on the scope.(3)The study reveals the decay rule of wave.The speed of spreading to the other side is faster than the wave upward and downstream propagation speed in the V shape cross section area.And it is opposite that the U shaped cross section area.We divide the wave into stages of formation and propagation.The wave height during the period of formation attenuate slower than on the period of propagation,that is more slowly in particular cases with curve attenuation.The attenuation speed is more fast,and range is larger in the V shape cross section area,and it is opposite that the U shaped cross section area.It will form reflected waves swell when the waves spread to the other side of the convex bank.It will form huge fan reflection wave propagation in a corner under the condition.