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토사재해 취약 지역 분류 및 구조적 대안 수립을 위한 위험지표 적용
오승명 ( Seung Myeong Oh ),송창근 ( Chang Geun Song ),정민형 ( Min Hyung Jung ),성주현 ( Joo-hyun Seong ) 한국안전학회 2017 한국안전학회지 Vol.32 No.3
This study applied risk indexes to the disaster flow event occurred at Mt. Umyeon region in 2011. A 2D hydrodynamic model was employed to calculate flow characteristics, and the model was validated against two dam break flow problems conducted by Bellos and EU CADAM project. The model performance was shown to be satisfactory. In order to determine which index is more appropriate to assess the vulnerability of debris flow, 3 risk indexes (FII, FHR and VDI) were considered. It was found that VDI, which determines the risk level only by the velocity factor, consistently predicted the risk level corresponding to 6 because the velocity range was widely organized. However, in the case of FII and FHR, the risk was reasonably quantified due to combined consideration of significant factors of flow velocity and debris thickness. Therefore, FII and FHR are expected to be more accurate than VDI. However, two indexes still need to be improved to include major factors such as debris density or material properties.
방어구조물 형상에 따른 토석류의 유입특성과 위험도 평가
오승명 ( Seung Myeong Oh ),송창근 ( Chang Geun Song ),이승오 ( Seung Oh Lee ) 한국안전학회(구 한국산업안전학회) 2016 한국안전학회지 Vol.31 No.6
This study analyzed the inflow characteristics of debris flow according to shape of defensive structure and computed risk index. In order to simulate debris flow, two shapes of defensive structure were considered. Initial mass distribution was set with a rectangular shape and defensive structures were set semi-circular shape and rectangular shape, respectively. It was found that a defensive structure with semicircular shape was more vulnerable to debris impact compared with rectangular shape because the flow mass became concentrated in quadrant part of the inner circle. If the velocity of the debris flow was less than 1 m/s, the risk assessment by FII (Flood Intensity Index) was much appropriate. However, when the movement of debris runout was faster than 1 m/s, the risk index of FHR (Flood Hazard Rating) provided improved classification due to its subdivided hazardous range.
토사재해 위험지역의 구조적 대안 설정을 위한 사태물질 초기 질량분포 및 방어시설물 형상의 영향 분석
성주현 ( Joo Hyun Seong ),오승명 ( Seung Myeong Oh ),정영훈 ( Younghun Jung ),변요셉 ( Yoseph Byun ),송창근 ( Chang Geun Song ) 한국안전학회(구 한국산업안전학회) 2016 한국안전학회지 Vol.31 No.2
A 2-D hydrodynamic model for predicting the movement of debris flow was developed. The developed model was validated against a dam break flow problem conducted in EU CADAM project, and the performance of the model was shown to be satisfactory. In order to suggest structural alternative for hazardous zone vulnerable to debris flow disaster, two types of initial mass distribution and two shapes of defensive structure were considered. It was found that 1) the collapse of debris mass initiated with square pyramid shape induced more damage compared with that of cubic shape; and 2) a defensive structure with semi-circular shape was vulnerable to debris flow disaster in terms of debris control or primary defense compared with that of rectangular-shaped structure.