卡里巴 (Kariba)拱坝下游河床冲深达 5 7～ 80m ,是世界上河床冲刷最为严重的拱坝 ,有着其地质、泄水布置等方面的原因。其中主要原因是泄水中孔出口佛劳德数较低 ,6股水舌入水后能量聚集 ,同时河床又未采取保护措施。总结其经验可避免类似冲刷在我国出现 ,对小湾、溪落渡等高拱坝护坡不护底水垫塘的论证有着重要意义 ,对其它工程也有参考意义 Downstream of Kariba arch dam, the river bed reaches a depth of 5 7 ~ 80 m. It is the most serious riverbed erosion dam in the world and has its geological and drainage layout. The main reason for this is that the effluent outlet has a lower Freudian number, and 6 water tongues enter the water and accumulate energy. At the same time, the river bed has not taken any protective measures. Summarizing its experience can avoid similar scour in our country, and it is of great significance to the demonstration of the protection of high arch dams such as Xiaowan and Xiluodu. It also has reference significance to other projects