Experimental approach on measurement of impulsive fluid force using debris flow model

This paper presents an experimental approach on measurement of impulsive fluid force using several materials of debris flow model. First, the hydrodynamic test for only water was performed by using water in stead of debris flow in order to confirm the measurement accuracy of impulsive fluid force as a preliminary test. Second, three kinds of debris flow model, i.e., sediment with water, gravel with sediment including water and beads with water were used as the quasi-debris flow by using channel test with a sharp slope. Third, the pumice stone produced at the Sakurajima volcanic mountain was used as the quasi-debris flow by flowing it naturally. This final test resulted in showing the impulsive load –time relation by presenting the surge in front wave.