Study for Analyzing Travel Time and Runout Distance of the Debris Flow

Abstract

In this study, model experiments in laboratory were performed to analyze the behavior of debris flow that included the travel time and deposit area according to the change in topographic conditions and rainfall intensity. According to the experimental results, the travel time at failure initiation was shortened owing to the increased channel slope and rainfall intensity. Similarly, runout distance of the debris flow increased when the length of slope and thickness of the soil increased. Further, deposit area of the debris flow was increased as the channel slope, length of slope, and thickness of soil increased, and the analysis on deposit area was related to the increase in the amount of debris flow. According to the experimental result of the various topographical conditions, the deposit area was increased linearly as the travel time increased. Moreover, increase in the rainfall intensity resulted in decreased travel time and increased debris amount.