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Numerical Simulation for Behavior of Debris Flow according to the Variances of Slope Angle  

Kim, Sungduk (중앙대학교 토목공학과)
Yoon, Ilro (경북대학교 건설방재학부)
Oh, Sewook (경북대학교 건설방재학부)
Lee, Hojin (충북대학교 토목공학과)
Bae, Wooseok ((주)나노지오이엔씨 기술연구소)
Publication Information
Journal of the Korean GEO-environmental Society / v.13, no.6, 2012 , pp. 59-66 More about this Journal
Abstract
The purpose of this study is to estimate the behavior and the mechanism of debris flow on the slope, which has specially various gradient plane. The numerical simulation was performed by using the Finite Differential Element method (FDM) based on the equation for the mass conservation and momentum conservation. The mechanism of flow type for debris flow is divided into three flow types which are stony debris flow, immature debris flow, and turbulent water flow, respectively. First, flow discharge, water flow depth, sediment volume concentration was investigated by variable input of flow discharge at the straight slope angle and two step inclined plane. As the input of flow discharge was decrease, flow discharge and water flow depth was increased, after the first coming debris flow only reached at the downstream. As the input of flow discharge was increased, the curve of flow discharge and flow depth was highly fluctuated. As the results of RMS ratio, the flow discharge and flow depth was lower two step slope angle than the straight slope angle. Second, the behavior of debris flow was investigated by the four cases of gradient degree at the downstream of slope angle. The band width of flow discharge and flow depth for $14^{\circ}$ between $16^{\circ}$ was higher than other gradient degree, and fluctuation curve was continuously high after 10 seconds.
Keywords
Debris flow; Finite difference element; Momentum conservation; Immature debris flow; Slope angle;
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