NUMERICAL STUDY ON FACTORS INFLUENCING RESERVOIR SURGE BY LANDSLIDE

Study on the hazard of water surge induced by landslide is an important content in the chain of reservoir landslide hazard. The surge hazard is a difficult and hot problem in landslide and hydropower project fields. In this paper, the coupling of Euler and Lagrange (CEL) algorithm and the orthogonal numerical method are used to study the influence of landslide body shape, landslide front morphology, landslide volume, friction factor of slide surface and the water surface width on the surge. The results are as follows. For the slide body with the same volume, the wedge shape formats the largest surge. The larger of the front angle of the wedge the higher of the surge height. This kind of effect is more significant in the near field. Secondly, the volume of landslide has a greater influence on the surge height. With the increasing of the volume the surge height increases too. Thirdly, under the same conditions, the surge height decreases with the increasing of the friction coefficient of sliding surface. Fourthly due to the blocking effect, as the water surface width decreases, the surge height shows an increasing tendency. Especially the climbing height of the surge increases significantly.