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Vol.44, No.2, PP.97-190
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1
The Effects of the Cover Ratio of Erosion Control Geosynthetic Mesh on Soil Losses along Hillslopes
44(2):158-164
Shih-Hao Jien* Ming-Hsi Lee Wei-Hsin Chien Tzu-Yang Tai Chung-Chi Wang Chun-Ting Chen
* Corresponding Author. E-mail : shjien@mail.npust.edu.tw
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2
The Factors of Evacuation Decisions for Local Governments and Inhabitants in Debris-Flow Potential Areas
44(2):165-178
Chen-Yu Chen*
* Corresponding Author. E-mail : cychen59@gmail.com
Show preview   |   PDF( 1.8MB )   |  
3
Characteristic Analysis of Rainfall-induced Landslide Potential in Western Taiwan
44(2):179-189
Chien-Hsin Chen[1]* Yi-Hsun Chen[1] Chih-Hao Tan[1] Shu-Yeong Chi [1] Tai-Wei Su[2]
* Corresponding Author. E-mail : chchen@sinotech.org.tw
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4
Numerical Analysis of Slope Stability at the 115.9k Point of the Su-Hua Highway
44(2):97-104
Huang-Kuei Chu[1] Chia-Ming Lo[2]* Yu-Lin Chang[3]
* Corresponding Author. E-mail : cmlo@ctu.edu.tw
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5
3-D Mechanical Conversion Model for the Soil-Root System of the Predominant Plant in the Shi-Men Watershed
44(2):105-120
Der-Guay Lin Bei-Jian Chiou Sheng-Hsien Wang* Shin-Hwei Lin
* Corresponding Author. E-mail : twarvin@ems.chiayi.gov.tw
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6
Analysis of Environmental Factors and Landslide Susceptibility Prediction for the Watershed Landslides
44(2):121-130
Mu Jing[1] Chao-Yuan Lin[2]*
* Corresponding Author. E-mail : cylin@water.nchu.edu.tw
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7
Soil Water Index Applied as a Debris Flow Warning- Reference Based on a Tank Model
44(2):131-143
Su-Chin Chen[1] Chiao-Wen Tsai [1]* Chen-Yu Chen[2] Mei-Chen Chen[2]
* Corresponding Author. E-mail : d099042001@mail.nchu.edu.tw
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8
The Monitoring and Flow Dynamics of Gravelly Debris Flows
44(2):144-157
Hsien-Ter Chou[1] Ching-Fang Lee[2]* Chih-Hsuan Huang[3] Yu-Long Chang[1]
* Corresponding Author. E-mail : cflee@sinotech.org.tw
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The Monitoring and Flow Dynamics of Gravelly Debris Flows
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Hsien-Ter Chou[1] Ching-Fang Lee[2]* Chih-Hsuan Huang[3] Yu-Long Chang[1]

Abstract
In this study, rainfall-induced debris flows in the Houyenshan gravelly gullies,Miaoli, and the corresponding rainfall threshold conditions are explored. Based on the in-situ rain gauge data from the monitoring system and field surveys during the period from 2006 to 2012, we found the debris flow tends to occur when the total rainfall exceeds 57.5 mm and the subsequent rainfall intensity is higher than 3 mm/hr. Field survey and terrestrial LiDAR measurement indicate the talus deposition in the source areas and outbursts of landslide dams on the gully bed are the dominant factors inducing debris flows. Finally, HHT spectrum analysis of geophone signals for stony debris
flows depicts the peak frequencies within the range of 10-50 Hz. The temporal intensity distribution of geophone signals are determined by both the magnitude of debris flows and travel distance with respect to the monitoring station.
Key Words : Houyenshan, gravelly gullies, debris flows, critical rainfall line, dam break.
Department of Civil Engineering, National Central University, Jhongli, Taiwan, ROC.
Disaster Prevention Technology Research Center, Sinotech Engineering Consultants, Inc., Taipei, Taiwan, ROC.
Argicultural Engineering Research Center, Jhongli, Taiwan, ROC.
* Corresponding Author. E-mail : cflee@sinotech.org.tw
Received: 2012/11/13
Revised: 2013/01/22
Accepted: 2013/03/08
   Copyright © 2011 Chinese Soil And Water Conservation Society   MAP    
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