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Remote Sens. 2016, 8(11), 900; doi:10.3390/rs8110900

Direct Measurements of Bedrock Incision Rates on the Surface of a Large Dip-slope Landslide by Multi-Period Airborne Laser Scanning DEMs

Central Geological Survey, Ministry of Economic Affairs, Taipei 235, Taiwan
Department of Geosciences, National Taiwan University, Taipei 106, Taiwan
Institute of Earth Sciences, Academia Sinica, Taipei 115, Taiwan
Department of Earth Sciences, National Cheng Kung University, Tainan 701, Taiwan
Department of Geology, Chinese Culture University, Taipei 111, Taiwan
Author to whom correspondence should be addressed.
Academic Editors: Richard Gloaguen and Prasad S. Thenkabail
Received: 19 September 2016 / Revised: 17 October 2016 / Accepted: 23 October 2016 / Published: 29 October 2016
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This study uses three periods of airborne laser scanning (ALS) digital elevation model (DEM) data to analyze the short-term erosional features of the Tsaoling landslide triggered by the 1999 Chi-Chi earthquake in Taiwan. Two methods for calculating the bedrock incision rate, the equal-interval cross section selection method and the continuous swath profiles selection method, were used in the study after nearly ten years of gully incision following the earthquake-triggered dip-slope landslide. Multi-temporal gully incision rates were obtained using the continuous swath profiles selection method, which is considered a practical and convenient approach in terrain change studies. After error estimation and comparison of the multi-period ALS DEMs, the terrain change in different periods can be directly calculated, reducing time-consuming fieldwork such as installation of erosion pins and measurement of topographic cross sections on site. The gully bedrock incision rate calculated by the three periods of ALS DEMs on the surface of the Tsaoling landslide ranged from 0.23 m/year to 3.98 m/year. The local gully incision rate in the lower part of the landslide surface was found to be remarkably faster than that of the other regions, suggesting that the fast incision of the toe area possibly contributes to the occurrence of repeated landslides in the Tsaoling area. View Full-Text
Keywords: multi-period ALS DEMs; dip-slope landslide; swath profiles; incision rates multi-period ALS DEMs; dip-slope landslide; swath profiles; incision rates

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Hsieh, Y.-C.; Chan, Y.-C.; Hu, J.-C.; Chen, Y.-Z.; Chen, R.-F.; Chen, M.-M. Direct Measurements of Bedrock Incision Rates on the Surface of a Large Dip-slope Landslide by Multi-Period Airborne Laser Scanning DEMs. Remote Sens. 2016, 8, 900.

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