Grains Deposition from Debris Flow Due to Decrease of Channel Slope and Expansion of the Width

Abstract

There occurs rapid deposition from debris flows at the mouth of mountain canyon because of rapid flattening of the slope. First, grain movement in debris flow in the deposition process is investigated experimentally and theoretically. From the measurement of the locations of deposited grains in the experiments, their mean, standard deviation and correlation coefficient are determined. The equation for the period of grain movement and the mean location of deposited grains are derived. Finally, by using the results of grain movement deposition profile is calculated.