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Vol.49, No.1, PP.001-069
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1
Landslide Distributions Identified by Satellite Images and Field Investigations in a Natural Forested Catchment: The Case of Landslides Induced by Typhoon Soudelor in 2015
49(1):001-011
Song-Jin Lin[1][2] Wei-Li Liang[1]*
* Corresponding Author. E-mail : liangwl@ntu.edu.tw
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2
Field Experiments on General Scour in Upstream Creek Riverbeds
49(1):012-026
Hsun-Chuan Chan[1]* Luo-An Sung[1] Wen-Huil Liao[2] Zheng-Jun Li[2]
* Corresponding Author. E-mail : hcchan@nchu.edu.tw
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3
Landslide Mapping and Geomorphologic Change Based on a Sky-View Factor and Local Relief Model: A Case Study in Hongye Village, Taitung
49(1):027-039
Ching-Fang Lee [1]* Ting-Chi Tsao [1] Wei-Kai Huang [1] Sheng-Chi Lin [2] Hsiao-Yuan Yin[3]
* Corresponding Author. E-mail : cflee@sinotech.org.tw
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4
Application of UAV imagery to analyze Phoenix Valley landslide and landslide dam
49(1):040-048
Ming-Der Yang* Kai-Siang Huang Chih-Fan Chao
* Corresponding Author. E-mail : mdyang@dragon.nchu.edu.tw
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Application of UAV imagery to analyze Phoenix Valley landslide and landslide dam
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Ming-Der Yang* Kai-Siang Huang Chih-Fan Chao

Abstract
Landslide dam breaking can be a severe threat to the downstream area because of the damage caused by massive debris flow as a secondary disaster. A magnitude 6.3 earthquake struck Taiwan on June 2, 2013, and triggered
a landslide, which resulted in the formation of a natural landslide dam in the South Qingshuigou watershed near
the Phoenix Valley Bird Park. To efficiently estimate the landslide’s scale and evaluate the landslide dam’s stability,this study used an unmanned aerial vehicle to photograph the landslide scene and employed image-based modeling (IBM) approaches to construct a three-dimensional (3D) model of the landslide scene. This study also performed coordinate transformation using length constraints to obtain a 3D model at an absolute scale. The dimensionless blockage index (DBI) could be calculated for the landslide dam by using spatial information retrieved from the constructed 3D model. The volume of this earthwork was estimated as 136,588 m3, and the DBI of the landslide dam was 3.37, indicating that the landslide dam was unstable. The constructed model provides timely and precise 3D geoinformation and can be used as a reference for aftermath strategizing.
Key Words: UAV, IBM, 3D model, dimensionless blockage index.
Department of Civil Engineering, National Chung Hsing University, Taichung, Taiwan, R.O.C.
* Corresponding Author. E-mail : mdyang@dragon.nchu.edu.tw
Received: 2017/03/02
Revised: 2017/05/05
Accepted: 2017/10/22
5
Numerical Analysis on Landslide of an Inclined Soil Layer Caused by Rain Infiltration
49(1):049-058
Chyan-Deng Jan[1][2]* Shin-Lin Chen[1] Ssu-Yao Yang[1]
* Corresponding Author. E-mail : cdjan@mail.ncku.edu.tw
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6
Eco-Environmental Construction of the Taichung Han-Chi Drainage with Integration of Public Participation
49(1):059-069
Yung-Chi Shih Su-Chin Chen* Cheng-Wei Kuo
* Corresponding Author. E-mail : scchen@nchu.edu.tw
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