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( Man-il Kim ),( Namgyun Kim ),( Seungyoub Yi ),( Hiroaki Noda ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Geological characteristics of Ulleung Island include lands covered with eruptive rocks caused by multiple volcanic activities, deep layers of colluvium, and residual soils from weathering and erosion. Given this, such areas near mountains are vulnerable to localized heavy rain and typhoons, particularly in the summer season, along with the increasing frequency of soil erosion, falling rocks, and landslides every year. Accordingly, debris flow has a high chance of occurrence in mountain streams as slope failure and landslides frequently occur in the thawing season in February, the summer season from June to September, and November. In addition, the seasons when ground disasters occur at mountain areas frequently are normally the busiest months of Ulleung Island wherein the number of tourists increases from March, which is the beginning of the thawing season, and decreases from November. Thus, sufficient preparation for ground disasters is crucial. We, therefore, conducted this study on account of the landslide and debris flow incidents in Ulleung Island during the summer of 2016. In this study, we assess the functions of protection facilities that have been installed to mitigate debris flow hazard through simulation analyses, identifying the characteristics of ground disasters at mountain areas in the island and suggesting the types of damage caused.
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