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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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Landslide Distributions Identified by Satellite Images and Field Investigations in a Natural Forested Catchment: The Case of Landslides Induced by Typhoon Soudelor in 2015
Close
Song-Jin Lin[1][2] Wei-Li Liang[1]*

Abstract
Typhoon Soudelor brought high-intensity, short-duration rainfall and was the largest typhoon event to strike Taiwan in 2015. However, the effects of the typhoon on natural forested areas have been little reported. This study investigated the spatial distribution of new landslides in the Tsukeng catchment in Fushan Experimental Forest and compared their effects through satellite images and field investigations. Based on satellite image analysis, 62 new landslides were induced by the typhoon. The surface area of the landslides increased with slope gradient, except for
areas of stream-bed fluctuation. The characteristics and types of landslides were different along three field investigation lines. The Shuiguan trail showed smaller landslides but included four types, namely cracks, collapses, gully expansions,and compounding. For 56% of the landslides occurring at downslope locations along the Tsukeng stream, cracks or collapses were also found at corresponding locations in the upslope direction along the Shuiguan trail. It suggests the consecutiveness of mass movements between the upslope and downslope, as well as impending movements at these locations in the near future. Since these effects are barely detectable from satellite images alone, it is necessary to use them in combination with field investigations to collect the greatest amount of information possible.
Keywords: Field investigation, landslide type, natural forested catchment, satellite image analysis.
〔1〕School of Forestry and Resource Conservation, National Taiwan University, Taipei, Taiwan, R.O.C.
〔2〕Forestry Bureau, Council of Agriculture, Executive Yuan, Taiwan, R.O.C.
* Corresponding Author. E-mail : liangwl@ntu.edu.tw
Received: 2017/02/07
Revised: 2017/03/22
Accepted: 2017/10/18
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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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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