Laboratory Analysis of Debris Flow Characteristics and Berm Performance

Water

Hyungjoon Chang¹  Hojin Lee¹  Kukhyun Ryou¹ 

[1] School of Civil Engineering, Chungbuk National University, Cheongju 28644, Korea;

关键词: runout distance;    debris flow;    berm;    volumetric concentration;   

DOI  :  10.3390/w13162223

来源: DOAJ

【 摘 要 】

In this study, laboratory tests were used to determine the deposition characteristics (runout distance, lateral width, and deposition area) of debris flow and their relationships with the flow characteristics (flow velocity and flow depth) according to the presence of a berm. An experimental flume 1.3 to 1.9 m long, 0.15 m wide, and 0.3 m high was employed to investigate the effects of channel slope and volumetric concentration of sediment with and without the berm. The runout distance (0.201–1.423 m), lateral width (0.045–0.519 m), and deposition area (0.008–0.519 m²) increased as the channel slope increased and as the volumetric concentration of sediment decreased. These quantities also increased with the flow velocity and flow depth. In addition, the maximum reductions in the runout distance, lateral width, and deposition area were 69.1%, 65.9%, and 93%, respectively, upon berm installation. The results of this study illustrate general debris flow characteristics according to berm installation; the reported relationship magnitudes are specific to the experimental conditions described herein. However, the results of this study contribute to the design of site-specific berms in the future by providing data describing the utility and function of berms in mitigating debris flow.

【 授权许可】

Unknown