The objective of this study is to suggest rainfall threshold for landslide forecasting and warning. For this study, we chose the research area where landslide have occurred. And we performed infiltration-stability analysis with rainfall intensity-duration. As the results of this study, slope stability variation chart with rainfall intensity-duration are established. This kind of chart is believed to be able to be used for forecasting and warning the landslide caused by rainfall. 실제 산사태가 발생한 곳은 연구대상지역에서 5 개소 (Fig. 1) 이고 이 중에서 Site-2 인근에서 수평거리 약 300 m 수직거리 120 m의 단면을 추출한 후 가장 위험한 단면으로 예상되는 높 이 30 m의 사면을 대상으로 지하수위를 고려하여 해석을 수행 하였다 (Fig. 2).
The objective of this study is to develop an early warning system for rainfall induced landslides. For this study, we suggested an analysis process using rainfall forecast data. 1) For a selected slope, safety factor with saturated depth was analyzed and safety factor threshold was established (warning FS threshold=1.3, alarm FS threshold=1.1). 2) If rainfall started, saturated depth and safety factor was calculated with rainfall forecast data, 3) And every hour after safety factor is compared with threshold, then warning or alarm can issued. In the future, we plan to make a early warning system combined with the in-situ inclinometer sensors.
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