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Landslide Characteristics induced by Heavy Rainfall in Samcheok Area  

Song Young-Suk (Geological & Environmental Hazards Division, Korea Inst. Of Geoscience and Mineral Res.)
Jang Yoon-Ho (Dept. of Geosystem Engineering, Samcheok National University)
Kim Jin-Seok (Dept. of Geosystem Engineering, Samcheok National University)
Publication Information
The Journal of Engineering Geology / v.15, no.4, 2005 , pp. 435-445 More about this Journal
Abstract
Landslides induced by heavy rainfall from typhoon 'Rusa' in 2002 and typhoon 'Meami' in 2003 were investigated at Samcheok area, and the relationship between landslides and rainfall on that area was analyzed. The average annual rainfall at Samcheok area is generally $1,200mm\~1,300mm$. However, the average annual rainfall at samcheok for 2003 and ton was increased more than 2,000mm because of typhoon 'Rusa' and typhoon 'Meami'. The number of landslides and the landslides area are largely occurred in a area of the relatively high maximum hourly rainfall and 2days cumulative rainfall. Therefore, it confirmed that landslides are directly depended on the hourly rainfall and the cumulative rainfall. The landslides at Samcheok area induced by heavy rainfall due to typhoon are more influenced by the maximum hourly rainfall at the landslide occurrence day. In order to predict a rational landslide size, a new method included the maximum hourly rainfall and the landslide area in a traditional way was proposed. As the result of applying the new proposed method, the landslide size at Samcheok area is involved in the large scale landslide.
Keywords
landslides; typhoon; hourly rainfall; cumulative rainfall; Samcheok area;
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