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Nat. Hazards Earth Syst. Sci., 18, 709-727, 2018
https://doi.org/10.5194/nhess-18-709-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
05 Mar 2018
Geomorphological evolution of landslides near an active normal fault in northern Taiwan, as revealed by lidar and unmanned aircraft system data
Kuo-Jen Chang1, Yu-Chang Chan2, Rou-Fei Chen3, and Yu-Chung Hsieh4 1Department of Civil Engineering, National Taipei University of Technology, Taipei, 10654, Taiwan R.O.C
2Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan R.O.C
3Department of Geology, Chinese Culture University, Taipei, 11114, Taiwan R.O.C
4Central Geological Survey, MOEA, Taipei, Taiwan R.O.C
Abstract. Several remote sensing techniques, namely traditional aerial photographs, an unmanned aircraft system (UAS), and airborne lidar, were used in this study to decipher the morphological features of obscure landslides in volcanic regions and how the observed features may be used for understanding landslide occurrence and potential hazard. A morphological reconstruction method was proposed to assess landslide morphology based on the dome-shaped topography of the volcanic edifice and the nature of its morphological evolution. Two large-scale landslides in the Tatun volcano group in northern Taiwan were targeted to more accurately characterize the landslide morphology through airborne lidar and UAS-derived digital terrain models and images. With the proposed reconstruction method, the depleted volume of the two landslides was estimated to be at least 820 ± 20  ×  106 m3. Normal faulting in the region likely played a role in triggering the two landslides, because there are extensive geological and historical records of an active normal fault in this region. The subsequent geomorphological evolution of the two landslides is thus inferred to account for the observed morphological and tectonic features that are indicative of resulting in large and life-threatening landslides, as characterized using the recent remote sensing techniques.
Citation: Chang, K.-J., Chan, Y.-C., Chen, R.-F., and Hsieh, Y.-C.: Geomorphological evolution of landslides near an active normal fault in northern Taiwan, as revealed by lidar and unmanned aircraft system data, Nat. Hazards Earth Syst. Sci., 18, 709-727, https://doi.org/10.5194/nhess-18-709-2018, 2018.
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Short summary
Several remote sensing techniques, i.e., aerial photographs, drone images, and airborne lidar, were used in this study to decipher the morphological features of obscure landslides in volcanic regions and how the observed features may be used for understanding landslide occurrence, subsequent geomorphological evolution, and potential hazards. Two large-scale landslides were characterized and quantified in this study.
Several remote sensing techniques, i.e., aerial photographs, drone images, and airborne lidar,...
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