Abstract
This paper proposes a simulation method on trap performance on the steel check dam subjected to woody debris flow by using 3 dimension distinct element method. The proposed method uses cylindrical elements for woody debris, and sphere elements for rock debris, respectively. Trap performance experiments are carried out by using water way and modeled structures, in advance. Segregation mechanism between woody debris and gravels, or large gravels and small gravels were observed. And trap performance of steel check dams, which have an intervals of pipe members, are checked with respect to contain ratio of woody debris, different ratio of gravel size and structural members interval. The proposed method shows reliable simulation of segregation mechanism and, trap mechanism of the structures as well as trap ratio of the debris.
