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Vol.49, No.2, PP.071-130
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1
Application of Time Domain Reflectometry Technology to Quantification of Reflected Waveforms on Coaxial Cables with Shear and Extension Tests
49(2):71-76
Yu-Shu Lin Shei-Chen Ho Jun-Yang Chen I-Hui Chen* Miau-Bin Su
* Corresponding Author. E-mail : cih82nchu@dragon.nchu.edu.tw
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2
Characteristics and Warning Methods of Ground Vibrations Generated by Debris Flows at Ai-Yu-Zi Creek
49(2):77-88
Shih-Chao Wei[1]* Ko-Fei Liu[1] Yi-Min Huang[2] Yao-Min Fang[3] Hsiao-Yuan Yin[4] Hsiao-Yu Huang[4] Chien-Liang Lin[4]
* Corresponding Author. E-mail : stanscwei@gmail.com
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Characteristics and Warning Methods of Ground Vibrations Generated by Debris Flows at Ai-Yu-Zi Creek
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Shih-Chao Wei[1]* Ko-Fei Liu[1] Yi-Min Huang[2] Yao-Min Fang[3] Hsiao-Yuan Yin[4] Hsiao-Yu Huang[4] Chien-Liang Lin[4]

Abstract
Ground vibrations provide relevant flow conditions and may be used to warn of potential debris flow.To construct warning methods for debris flow, geophone ground vibration recordings from four debris flows at Ai-Yu-Zi creek were analyzed. Based on time-frequency analysis, the effect of time span and frequency band were examined,and the representative indexes of accumulated power and accumulated power slope were extracted. With extracted indexes, we used ambient noise and scale factors to define warning thresholds. The warning times for debris flows were
calculated with floating warning thresholds and then successfully validated by two events with a maximum error of 4.2s.
Key Words: Debris flows, geophone, warning threshold.
〔1〕Department of Civil Engineering, National Taiwan University, Taipei, Taiwan, R.O.C.
〔2〕Department of Civil Engineering, Feng Chia University, Taichung, Taiwan, R.O.C.
〔3〕GIS Research Center, Feng Chia University, Taichung, Taiwan, R.O.C.
〔4〕Soil and Water Conservation Bureau, Council of Agriculture, Executive Yuan, Nantou, Taiwan, R.O.C.
* Corresponding Author. E-mail : stanscwei@gmail.com
Received: 2017/11/17
Revised: 2018/03/14
Accepted: 2018/03/16
3
Establishment of Landslide Susceptibility Early Warning Model in National Forest Areas Based on Geo-intrinsic and Hydro-extrinsic Factors
49(2):89-97
Su-Chin Chen Chun-Yi Wu*
* Corresponding Author. E-mail : cywu@nchu.edu.tw
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4
Object-based Classification for Detecting Landslides and Vegetation Recovery—A Case at Baolai, Kaohsiung
49(2):98-109
Ying-Tong Lin[1] Kuo-Chen Chang [1]* Ci-Jian Yang[2]
* Corresponding Author. E-mail : twnrsworld@hotmail.com
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5
Rheological Experiments and Slump Tests of Kaolin Slurries
49(2):110-116
Chyan-Deng Jan * Ciao-Kai Hsu Chih-Yuan Yang
* Corresponding Author. E-mail : cdjan@mail.ncku.edu.tw
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6
Comparison of Downstream Erosion Between Permeable and Impermeable Groundsill Throung Flume Tests
49(2):117-130
Chong-Yu Sun[1] Shaohua Marko Hsu[2*] Chun-Hung Wu[3] Pi-Fang Hung[4]
* Corresponding Author. E-mail : shhsu@fcu.edu.tw
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