摘要
A high-speed giant landslide occurred in Yigong River in the Bomi, Tibet, on April 9, 2 000. A landslide dam was formed suddenly with 2 500 m long, 2 500 m wide and 60 m high, 280～300 million m3 in volume. A debris barrier lake was formed. Taking the dam-break of Yigong barrier lake as an example, according to the continuity equation and Navier-Stokes equation, combining with standard turbulence model, and tracking the free-surface with VOF method, via computational fluid dynamics software Fluent, this paper analyzes the dam-break flood evolution in downstream river course and the velocity changes at different sites. The simulation results are consistent with the observed data. At the same time, it shows that the model can simply simulate the flood evolution in the river bend with complex terrain after dam-break. The study can provide the prevention of dam-break disaster in terms of downstream flooding.
