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A Feasibility Study of a Rainfall Triggeirng Index Model to Warn Landslides in Korea
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  • Journal title : The Journal of Engineering Geology
  • Volume 26, Issue 2,  2016, pp.235-250
  • Publisher : The Korea Society of Engineering Gelolgy
  • DOI : 10.9720/kseg.2016.2.235
 Title & Authors
A Feasibility Study of a Rainfall Triggeirng Index Model to Warn Landslides in Korea
Chae, Byung-Gon; Choi, Junghae; Jeong, Hae Keun;
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 Abstract
In Korea, 70% of the annual rainfall falls in summer, and the number of days of extreme rainfall (over 200 mm) is increasing over time. Because rainfall is the most important trigger of landslides, it is necessary to decide a rainfall threshold for landslide warning and to develop a landslide warning model. This study selected 12 study areas that contained landslides with exactly known triggering times and locations, and also rainfall data. The feasibility of applying a Rainfall Triggering Index (RTI) to Korea is analyzed, and three RTI models that consider different time units for rainfall intensity are compared. The analyses show that the 60-minute RTI model failed to predict landslides in three of the study areas, while both the 30- and 10-minute RTI models gave successful predictions for all of the study areas. Each RTI model showed different mean response times to landslide warning: 4.04 hours in the 60-minute RTI model, 6.08 hours in the 30-minute RTI model, and 9.15 hours in the 10-minute RTI model. Longer response times to landslides were possible using models that considered rainfall intensity for shorter periods of time. Considering the large variations in rainfall intensity that may occur within short periods in Korea, it is possible to increase the accuracy of prediction, and thereby improve the early warning of landslides, using a RTI model that considers rainfall intensity for periods of less than 1 hour.
 Keywords
landslide;rainfall intensity;RTI model;early warning;response time;
 Language
Korean
 Cited by
1.
지상 LiDAR 공간분석을 통한 산불·산사태 피해 계류의 연간 토사유입량 산정,서준표;이창우;김동엽;우충식;

한국방재학회 논문집, 2016. vol.16. 6, pp.219-227 crossref(new window)
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