Earthquake may trigger Landslide Lake,which is a great threat to the residents living downstream.Using high speed photography cooperated with positioning a group of labeled stakes,a set of test method was established and the whole process from erosion along the line to headcutting,the dam break characteristics of flood and landslide dam’s shape can be studied by this method.Experimental observation indicated that during landslide lake’s releasing period, the change of the channel shape is a gradual process,the erosion in the bottom is a headcutting process in the longitudinal orientation, both sides show gradual collapse process in the lateral orientation.With the experiment going on,scouring coefficient changes from large to small; from front to back of the landslide dam’s model,scouring coefficient changes from large to small.Breach is extending and alluvial fan become bigger and it extends towards both sides and ahead,at last discharge channel extends from breach to both sides,deepens in behind and finally forms an irregular trapeziform.
