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논문 기본 정보

자료유형
학술대회자료
저자정보
Viet, Tran The (Dept. of Construction & Disaster Prevention Eng., Kyungpook National University) Lee, Giha (Dept. of Construction & Disaster Prevention Eng., Kyungpook National University) An, Hyunuk (Dept. of Agricultural and Rural Engineering, Chungnam National University) Kim, Minseok (Korean Institute of Geoscience)
저널정보
한국수자원학회 한국수자원학회 학술발표회 한국수자원학회 2017년도 학술발표회
발행연도
2017.1
수록면
260 - 260 (1page)

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This study aims to compare the performance of TRIGRS (Transient Rainfall Infiltration and Grid-based Regional Slope-stability model) and TiVaSS (Time-variant Slope Stability model) in the prediction of rainfall-induced shallow landslides. TRIGRS employs one-dimensional (1-D) subsurface flow to simulate the infiltration rate, whereas a three-dimensional (3-D) model is utilized in TiVaSS. The former has been widely used in landslide modeling, while the latter was developed only recently. Both programs are used for the spatiotemporal prediction of shallow landslides caused by rainfall. The present study uses the July 2011 landslide event that occurred in Mt. Umyeon, Seoul, Korea, for validation. The performance of the two programs is evaluated by comparison with data of the actual landslides in both location and timing by using a landslide ratio for each factor of safety class ( index), which was developed for addressing point-like landslide locations. In addition, the influence of surface flow on landslide initiation is assessed. The results show that the shallow landslides predicted by the two models have characteristics that are highly consistent with those of the observed sliding sites, although the performance of TiVaSS is slightly better. Overland flow affects the buildup of the pressure head and reduces the slope stability, although this influence was not significant in this case. A slight increase in the predicted unstable area from 19.30% to 19.93% was recorded when the overland flow was considered. It is concluded that both models are suitable for application in the study area. However, although it is a well-established model requiring less input data and shorter run times, TRIGRS produces less accurate results.

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