| China is a country with a wide range of geological disasters, frequent disasters and complex types of disasters, of which the landslide disaster is the most widely distributed and the most serious one. Especially in case of high speed landslide, its high sliding velocity, fierce and spread in the water will bring heavy and even devastating disasters to ships, residents and engineering buildings.In order to study the movement of the surge caused by the decline of the bank slope, the law of propagation, the characteristics of the surge and the possible height of the surge in the reservoir area to prevent the potential instability and surge harm to the lower part of plant buildings. Based on the geological environment and reservoir characteristics of the GUOBU bank of the Laxiwa Hydropower Station, The numerical simulation is based on the RNCG model,the VOF method tracks the free surface, The physical model experiment is verified and combined with the empirical formula method. In this paper, the characteristics of the surge, the initial surge height, the climbing height, the propagation and the attenuation law of the landslide in the reservoirs of the Laxiwa Hydropower Station are studied. The main research results are as follows:(1)The physical model was used to test the collapse of the bank slope in the reservoir water level at 190m and 202m. The results show that the velocity of the sliding body is 13.01 m/s?23.66m/s and the maximum surge height is 22m ? 47m, 28 ~ 88m.(2)The process of landslide and surge formation is calculated by numerical simulation.From the start point of the landslide in the reservoir, as the landslide into the water,the shape of the water body showed splashing, before and after the collapse of the three basic forms. The test data indicates that the attenuation of surge near the point of entry of the landslide area is the fastest and the farther away from the disturbance point the slower the attenuation.(3) Revealing the wave height characteristics of landslide surge. According to the arrival time of the first wave, we found that the longer the distance, the shorter the time the first wave occurred. The simulation results show that with the landslide into the water speed increases, the first wave height increases, and the corresponding wave height increases. When the height and the angle of water entering of the landslide, the height of the first wave increases with the increase of the depth of the reservoir.(4) The landslide surge will produce climb on the other side, when the water level is in the same area, the climbing height increases with the increase of the height of landslide; At the same inlet speed, the height of the other side of the slope increases with the increase of water depth. The landslide generated by the slab is the fastest decaying in the range of 100m downstream of the other shore. After that, due to the change of the topography of the other side,it is slow to decay on a stable wave height value, and it will keep the stable value when it reaches the upper of the 600m. Comparing the experimental data with the numerical simulation,the error is less than 5%. The simulation model established in this paper can be used to reproduce the whole process of the interaction of the wave, the superposition and the reflection of the surge wave generated by the landslide. |
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