Abstract
Tsaoling is an important area for landslide studies in Taiwan because of its repetitive occurrences of landslides. In 1999, the Chi-Chi earthquake triggered a dip slope failure and the landslide mass deposit in the channel and opposite bank of the Chinshui River. Long-term (3 decades) as well as the rapid landscape evolution after the Chi-Chi earthquake is inspected in the present study, by using a total number of ten high-resolution digital terrain models (DTMs). These DTMs were constructed by using aerial orthophotos dated between 1979 and 2009 and they were calibrated against the 2009 DTM, with the root mean square error controlled to be less than 1 m. The focus is on the surface elevation changes of two representative cross-sections and recession of the Chunqui Cliff in the landslide scarp zone. Because the Chinshui River cuts through the loose deposit, significant incision was found and the incision undergoes a common exponential natural process. The half-life time is estimated about 3.2–4.3 years. On the other hand, cliff recession is associated with the extreme climate events and the recession rate is found to increase after 2003.
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Kuo, CY., Chen, RF., Wu, RY., Chang, KJ. (2015). Use of Multiple Digital Terrain Models and Aerial Orthophotos for Landscape Evolution in Tsaoling Landslide Area. In: Lollino, G., et al. Engineering Geology for Society and Territory - Volume 2. Springer, Cham. https://doi.org/10.1007/978-3-319-09057-3_74
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DOI: https://doi.org/10.1007/978-3-319-09057-3_74
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