Effect of multiple debris flow countermeasures on flow characteristics and topographic changes through real-scale experiment

Abstract

In this study, to investigate the effect of multiple countermeasure on the flow characteristics of debris flows, a real-scale experiment was conducted in a natural gully by reproducing a debris flow with a installation of multiple countermeasures. In addition, the topographic changes before and after experiment by debris flow were investigated using UAV-LiDAR. Based on the experiment results, the effect of multiple countermeasures and the topographic changes against the gully erosion and deposition caused by debris flow were also analyzed. The installation of multiple countermeasures significantly decreased the frontal velocity of debris flow. Furthermore, the countermeasure induced the deposition of debris material on the back of the countermeasure.

A Proposal for Sediment Control Countermeasures in Non-Flowing Mountain Streams

“…In recent years, flexible barriers have been used increasingly to moderate debris flows, debris/rock/snow avalanches, and rock-falls [10][11][12]. In particular, due to the advantages of low construction costs and increased hydraulic continuity, a flexible barrier with wire mesh as an open-type debris flow countermeasure has recently been employed [13][14][15]. This flexible barrier has the advantage of filtering debris materials and inducing deposition by absorbing the dynamic energy of debris flows.…”