Research progress on historical model of flood induced by dammed lakes in Sichuan

On May 12, 2008, an earthquake of magnitude 8.0 as measured by the China Earthquake Administration occurred at Wenchuan, Sichuan Province in southwest China. As a result of the earthquake, geohazards approaching of about 20 thousands were triggered with the types of rock fall, rock avalanches, landside, debris flow and earthquake-lakes. After the Wenchuan earthquake occurred in 2008,rivers in the earthquake district have been damaged seriously. Another thing is that there are at least 22 recorded earthquakes from 181 B.C to present in Sichuan province. By deploying Zhou´s historical model method, this note analyses the mechanism of dammed lakes induced by 22 earthquake. Comparison between previous 22 earthquakes and Wenchuan earthquake shows that generally, the river bed in Sichuan was eroded by the dammed lake induced flood. The results also show that the stability principle of rivers in the earthquake district should be considered in the stream corridor restoration process.