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http://dx.doi.org/10.5762/KAIS.2021.22.4.235

A Study on the Flow Characteristics of Debris Flow Using Small-scaled Laboratory Test  

Ryou, Kukhyun (School of Civil Engineering, Chungbuk National University)
Chang, Hyungjoon (School of Civil Engineering, Chungbuk National University)
Lee, Hojin (School of Civil Engineering, Chungbuk National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.22, no.4, 2021 , pp. 235-245 More about this Journal
Abstract
Recently, the frequency of torrential rain is increasing due to climate change, which causes a large amount of debris flows. The purpose of this study was to understand the flow characteristics of debris flow according to the change in channel slope and volumetric sediment concentration and to analyze the effects of a berm on the flow characteristics of debris flow. The flow characteristics of debris flow, such as flow velocity, flow depth, Froude number, and flow resistance coefficients, were calculated using laboratory tests. The effect of a berm was analyzed by comparing the experimental results of a linear channel with those of a one-stepped channel. The results showed that the channel slope affected the flow velocity and flow depth, and the volumetric sediment concentration affected the flow velocity and flow depth, Froude number, and flow resistance coefficient. Moreover, as a berm was installed, the flow velocity and flow depth decreased by up to 26.1% and 71.2%, respectively. This means that installing a berm reduces the flow velocity, thereby reducing the mobility and kinetic energy. These results provide useful information to understand better the flow characteristics of debris flow and the effectiveness of a berm.
Keywords
Debris Flow; Flow Characteristic; Volumetric Sediment Concentration; Berm; Flow Resistance Coefficient;
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Times Cited By KSCI : 2  (Citation Analysis)
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