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Vol.48, No.4, PP.153-205
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1
The Use of a Hydrological Catchment Model to Determine the Occurrence of Temporal Creeping in Deep-seated Landslides
48(4):153-162
Sheng-En Lin [1] Ya-Hsin Chan [1] Chih-Yu Kuo [1]* Rou-Fei Chen [2] Ya-Ju Hsu [3] Kuo-Jen Chang [4] Shin-Ping Lee [5] Ruo-Ying Wu [2] Ching-Weei Lin [6]
* Corresponding Author. E-mail : cykuo06@gate.sinica.edu.tw
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2
Application of Climate Change Scenario Data to Assess Debris Flow Impact and Volume
48(4):163-174
Tingyeh Wu* Hsin-Chi Li Yong-Ming Chen
* Corresponding Author. E-mail : tingyehwu1060@ncdr.nat.gov.tw
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3
Application of a High-Resolution Digital Surface Model Produced by an Unmanned Aerial Vehicle in Canopy Gap Interpretation and Slope Stability Assessment
48(4):175-187
Wei-Kai Huang[1]* I Ting[2] Ching-Fang Lee[1]
* Corresponding Author. E-mail : wuangwk@sinotech.org.tw
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Application of a High-Resolution Digital Surface Model Produced by an Unmanned Aerial Vehicle in Canopy Gap Interpretation and Slope Stability Assessment
Close
Wei-Kai Huang[1]* I Ting[2] Ching-Fang Lee[1]

Abstract
This study establishes a relationship between the density of canopy gaps and slope stability by using a
high-resolution digital surface model (DSM) made from images recorded by an unmanned aerial vehicle (UAV) to
semiautomatically estimate canopy gap density. Estimated gap density can be employed to identify potentially unstable slopes. The forested slopes adjacent to Xinzhuang Village in southern Taiwan were used as a case study. The estimated canopy gap density is consistent with that of the field investigation. Where the canopy gap density or slope gradient is low, the slope surface is generally undisturbed. Where canopy gaps are dense, tension cracks and scars are often present,bedrock orientation is more erratic, and gullies are more densely spaced on the slope surface. At the Xinzhuang village,a strongly negative relationship was identified between canopy irregularities detected in the DSM and slope instability.Canopy gap density detected with high-resolution DSM may therefore be a useful reference for preliminary slope hazard
mapping.
Key Words: unmanned aerial vehicle, digital surface model, semiautomatic interpretation, canopy gap, slope stability.
〔1〕Disaster Prevention Technology Research Center, Sinotech Engineering Consultants, Inc., Taipei 114, Taiwan, R.O.C.
〔2〕Geotechnical Engineering Research Center, Sinotech Engineering Consultants, Inc., Taipei 114, Taiwan, R.O.C.
* Corresponding Author. E-mail : wuangwk@sinotech.org.tw
Received: 2017/04/25
Revised: 2017/05/16
Accepted: 2017/09/26
4
Scour from Vertical Drop through Flume Experiment and FLOW-3D
48(4):188-196
Hao-Kai Ho * Po-Yen Liu Hung-Pin Huang
* Corresponding Author. E-mail : R04622020@ntu.edu.tw
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5
Elevation Variation Study in a Watershed Using Historical Topographic Maps
48(4):197-205
Ming-Te Sun[1] Kuei-Lin Fu[1] Kun-Che Chan[1] Yu-Wen Su[2]*
* Corresponding Author. E-mail : sywen2013@gmail.com
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6
Participation Motivation, Organizational Commitment, and Job Satisfaction for Soil and Water Conservation Volunteers
48(4):206-217
Ya-Ling Chen[1] Hsun-Chuan Chan[1]* Yan-Ling Wu[1] Yu-Hui Lin[2]Yung-Chuan Ko[2] Kuo-Feng Huang[2]
* Corresponding Author. E-mail : hcchan@nchu.edu.tw
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