Abstract
We report a catastrophic landslide occurred in Gokseong County, South Korea, on August 7, 2020. Torrential rain, with a cumulative rainfall of more than 250 mm for the preceding 3 days, contributed as a trigger or a primer to an initiation of slope failure and ensuing evolution to a debris flow. The runout length, area, and volume of the Gokseong landslide are estimated to be approximately 678 m, 4.63 × 104 m2, and 2–5 × 104 m3, respectively. This Gokseong landslide, with its long runout, has caused severe damage to the village located downstream with a total of five fatalities and five buried houses. This study not only reports the damaged area, rainfall characteristics, and triggering factors but also presents the terrain changes obtained through a field survey using unmanned aerial vehicles (UAVs) conducted 5 days after the event and the normalized difference vegetation index (NDVI) using Sentinel-2 data.
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All topographic data and images used to support the findings of this study are available from the corresponding author upon request.
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We would like to thank the anonymous reviewer for providing valuable comments and suggestions, which were very helpful in improving this manuscript.
Funding
This research was supported by the Basic Research Laboratory Program through the National Research Foundation of Korea (NRF) funded by the MSIT (NRF-2018R1A4A1025765), and this work is financially supported by Korea’s Ministry of Land, Infrastructure and Transport (MOLIT) as an Innovative Talent Education Program for Smart City.
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Choi, SK., Ramirez, R.A. & Kwon, TH. Preliminary report of a catastrophic landslide that occurred in Gokseong County, South Jeolla Province, South Korea, on August 7, 2020. Landslides 18, 1465–1469 (2021). https://doi.org/10.1007/s10346-020-01616-y
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DOI: https://doi.org/10.1007/s10346-020-01616-y