TY - GEN
T1 - The variability in time of the occurrence conditions of debris flow after catastrophic typhoons and earthquakes
T2 - 5th International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment
AU - Tsai, Y. J.
AU - Wang, K. C.
AU - Chen, Y. S.
AU - Shieh, C. L.
PY - 2011
Y1 - 2011
N2 - In Taiwan, large and often catastrophic typhoons and earthquakes are both factors to trigger serious landslides in mountains. The presences of large amounts of sediments due to the landslides increase the occurrence of debris flow. Base on post-event data, the threshold of debris flow occurrence decreases soon after an earthquake indicating a fast recovery. A relationship of debris flow occurrence from EGASHIRA (1997) is applied, which shows fine sediment plays an important role with debris-flow development and occurrence. In this paper, a series mobile-bed experiments were done to access the influence of the concentration change from upstream discharge with fine/coarse particle. Two variables were recorded in the experiment, which were depth-ratio (sediment layer depth/ total depth), and the sediment discharge. With comparison with theoretical relationship, the result shows the occurrence condition varied with the ratio of fine sediment.
AB - In Taiwan, large and often catastrophic typhoons and earthquakes are both factors to trigger serious landslides in mountains. The presences of large amounts of sediments due to the landslides increase the occurrence of debris flow. Base on post-event data, the threshold of debris flow occurrence decreases soon after an earthquake indicating a fast recovery. A relationship of debris flow occurrence from EGASHIRA (1997) is applied, which shows fine sediment plays an important role with debris-flow development and occurrence. In this paper, a series mobile-bed experiments were done to access the influence of the concentration change from upstream discharge with fine/coarse particle. Two variables were recorded in the experiment, which were depth-ratio (sediment layer depth/ total depth), and the sediment discharge. With comparison with theoretical relationship, the result shows the occurrence condition varied with the ratio of fine sediment.
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U2 - 10.4408/IJEGE.2011-03.B-017
DO - 10.4408/IJEGE.2011-03.B-017
M3 - Conference contribution
AN - SCOPUS:84861595719
SN - 9788895814469
T3 - International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, Proceedings
SP - 143
EP - 148
BT - 5th International Conference on Debris-Flow Hazard Mitigation
Y2 - 14 June 2011 through 17 June 2011
ER -