以小尺度模型實驗模擬土石流形貌變化與流變參數之關係

洪啟耀

doi:10.6342/NTU.2011.01553

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以小尺度模型實驗模擬土石流形貌變化與流變參數之關係

Relation between Debris Flow Rheology and Fan Deposit Morphology Investigated Using Small-scale Experiments

洪啟耀 , Masters　　Advisor：卡艾瑋　　

英文 DOI： 10.6342/NTU.2011.01553

土石流；快速掃描地形；微小尺度實驗；影像分析； debris flow ； fast scan method ； mirco-scale experiment ； image analysis

Abstract │ Reference (15) │ Times Cited (1) │ Altmetrics

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The aim of this thesis is to understand the relationship between rheology and morphology for debris flow going from a narrow valley to a fan. In micro-scale experiments, Kaolinite, black sand and water are mixed to represent debris flows of high viscosity. We change two parameters which are water content and the coarse particle content to observe variation in debris flow behavior due to changes in composition. To measure the fast flow and rapid deformation of the flow surface, a fast scan method using a high speed camera and rotating laser are developed. The results of the experiments are analyzed in two parts, one is channel flow behavior and another is the canyon-fan transition. In channelized results beside compare the experiments, we use kinematic wave to simulate the surge process in channel, and compare the cross section in field. At the canyon-fan transition, debris flow deposit in two stages. In the first stage, a high speed front advance on to fan. In the second stage, the slower tail tends to spread laterally. Increasing water content and decreasing coarse particle content makes the first stage longer and the second stage shorter. As a result, lateral deposits are few pronounced. Finally, the experimental results are compared with field observations.

Reference ( 15 ) 〈TOP〉

Berzi, D., and Jenkins, J.T. (2008) A theoretical analysis of free-surface flows of saturated granular-liquid mixtures. J. Fluid Mech. 608, 393-410.
連結：
Capart, H., Young, D. L., Zech, Y. (2002) Voronoi imaging methods for the measurement of granular flows. Exp. Fluids 32, 121-135.
連結：
Chi, T. A. (2007), Laser halo measurements of solid-liquid two phase flows, M. S. thesis, Graduate Institute of Civil Engineering, National Taiwan University.
連結：
da Cruz, F., Emam, S., Prochnow, M., Roux, J.N., and Chevoir, F. (2005) Rheophysics of dense granular materials: Discrete simulation of plane shear flows. Phys. Rev. E 72, 021309.
連結：
GDR Midi (2004) On dense granular flows. Eur. Phys. J. E 14, 341-365.
連結：

Times Cited (1) 〈TOP〉

莊哲凱(2015)。應用權重最小二乘局部近似法於土石流之數值模擬研究。臺灣大學土木工程學研究所學位論文。2015。1-53。

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