基于浅水波方程的滑坡涌浪分析研究

Study of Landslide Surge Analysis Based on Shallow Water Wave Equation

随着水电工程的不断发展,库区滑坡稳定性及涌浪灾害链是影响水库安全运行的重要因素之一。同时,滑坡涌浪问题也一直以来是地质灾害领域研究的热点和难点问题之一。从二维浅水波方程基本理论出发,从滑坡动力学及入水产生涌浪全过程的数值模拟方法进行系统分析,并在此基础上以贵州省索风营水电站近坝库区的卞家寨滑坡潜在的涌浪过程进行模拟分析。基于野外地质勘探成果,构建滑坡体的三维地质结构模型及库区和大坝模型。通过数值计算分析,涌浪产生的洪水虽然产生漫坝,但是持续时间短、峰值较小,加之大坝为重力坝,因此对大坝不会造成严重的危害,对下游河道产生较大洪水灾害的可能性不大。

With the continuous development of hydropower projects,the reservoir area landslide stability and surge hazard chain is one of the important factors affecting the safe operation of reservoirs.Meanwhile,landslide surge wave problem has been one of the hot and difficult problems of research in the field of geological hazards.Starting from the basic theory of two-dimensional shallow water wave equation,the numerical simulation method from landslide dynamics and the whole process of surge wave generated by entering water is systematically analyzed,and on this basis,the potential surge wave process of Bianjiazhai landslide in the near-dam reservoir area of Suofengying Hydropower Station in Guizhou Province is simulated and analyzed.Based on the results of field geological exploration,the three-dimensional geological structure model of the landslide body and the reservoir area and dam model are constructed.Through numerical calculation and analysis,although the flood generated by the surge produces a diffuse dam,the duration is short and the peak is small,plus the dam is a gravity dam,so it will not cause serious harm to the dam,and the possibility of producing a large flood disaster to the downstream river is unlikely.