Effects of Model Material Selection on the Similarity of Erosion Processes in Hydraulic Erosion Simulation Experiment

In order to solve the problems on the difficulties in model material selection,based on the previous results,the authors made a study on the effects of model material selection on the similarity of erosion processes in hydraulic erosion simulation experiment.The results showed that: the runoff processes basically met the requirement of similarity as long as the boundary conditions,including that rainfall intensity met λi=λ1/2l,and soil water content met λθ=1 etc.,were similar;Model material which been selected based on the suspension similitude rule should be verified whether it could meet the requirement of incipient motion similarity,model material which been verified couldn't meet the requirement of incipient motion similarity didn't meet the similarity of erosion processes;Model material which been selected based on the incipient motion similarity rule basically met the requirement of erosion processes similarity.It would be better to select model material based on the incipient motion similarity rule in water erosion simulation experiment on loess slop.