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http://dx.doi.org/10.9720/kseg.2022.4.571

A Long-Runout Landslide Triggered by Extreme Rainfall in Gokseong, South Korea on 7 August 2020  

Nam, Kounghoon (College of Civil Engineering, Tongji University)
Wang, Fawu (College of Civil Engineering, Tongji University)
Dai, Zili (Department of Civil Engineering, Shanghai University)
Kim, Jongtae (Nature and Tech Inc.)
Choo, Chang Oh (Department of Earth and Environmental Sciences, Andong National University)
Jeong, Gyo-Cheol (Department of Earth and Environmental Sciences, Andong National University)
Publication Information
The Journal of Engineering Geology / v.32, no.4, 2022 , pp. 571-583 More about this Journal
Abstract
On 7 August 2020, a large-scale catastrophic landslide was triggered by extreme rainfall at Osan village, Gokseong County, South Jeolla Province, South Korea. The initiation mechanism of the Gokseong landslide was different from those typical landslides that occurred in South Korea. Despite the relatively low elevation and slope degree, the landslide had a long runout distance of about 640 m over a total vertical distance of 90 m. A detailed field investigation and chemical analysis were conducted to understand the possible mechanisms for the high-speed and long-runout behavior of the landslide. The terrain controlled the motion behavior of the landslide and the seepage was observed at the whole landslide body. The clay-rich soils covered on granite bedrock of the landslide deposition area from the rice paddy field to the landslide crown. The results of this study may provide basic data for further research on the mechanisms for landslide initiation and propagation.
Keywords
Gokseong landslide; long-runout landslide; clay soils; field investigation; chemical analysis;
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