关键词: 坐落式崩塌, 滑坡涌浪, 简化数值模型, 初始涌浪产生模型, 三峡库区

Abstract: There are columnar collapse in many reservoir gorges and coastal zones, these collapse may be exhibited by situated collapse due to the failure of weak base rock mass. The debris will impact into the water and form impulse waves. It is a challenge to predict and analyze the large area and long-distance impulse wave quickly and accurately. The coupling process of collapse body and water body is black boxed, a high-precision initial surge generation model is formed by using the physical test formula, and the Boussinesq model is used to control the propagation of initial surge event wave. A simplified surge numerical model 3D-LWBM with similar calculation accuracy to the physical test is constructed. The results show that: 1) The timing sequence and accuracy of 3D-LWBM simulation of pseudo-two-dimensional numerical liquid level and measured point water level are in good agreement with the physical experiment results, and the accuracy is high. 2) The generation and propagation of impulse waves are predicted by 3D-LWBM in the complicated topographic channel of Longmenzhai dangerous rock mass in the Three Gorges Reservoir area. Compared with the results of fluid-landslide full coupled simulation, 3D-LWBM has better calculatiion accuracy and faster calculation speed. 3) When the mesh size is 1/6?1/4 of the initial wave length, 3D-LWBM can obtain a more accurate and resonable result. At the same time, 3D-LWBM has its own scope of application. This study can provide technical support for disaster prevention and mitigation of relevant impulse waves.

Key words: situated collapse, landslide-induced impulse wave, simplified numerical model, initial impulse wave generation model, the Three Gorges Reservoir area