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Climate change has caused localized torrential rainfalls and typhoons to occur more frequently, increasing damages to both life and property. In particular, debris flows have brought damages not only in mountainous areas but also in urban centers. Many studies have been carried out with the rising concern on debris flows. These studies applied different debris flow models and conduct analyses on behaviors of debris flow and on forecasting. Given this, however, the subject of the impact force of debris flows should also be taken into consideration. Thus, this study applied RAMMS and FLO-2D, two models for the numerical analysis of debris flows used to analyze impact force. Here, the selected study areas are Umyeonsan Mountain in Seoul and Majeoksan Mountain in Chuncheon, where damages on debris flows were caused by the localized heavy rains in 2011. To identify a debris flow–triggering rainfall, we used and applied rainfalls calculated at different frequencies (30-year, 50-year, 100-year, 200-year). This study calculated and compared impact forces produced by the two models at any point in the study areas. Identifying impact forces based on the comparison of the two models will be useful in selecting materials and equipment appropriate when installing facilities in mountainous regions.
2. 이론적 배경
2.1 NSI 정량지수
2.2 분포형 강우-유출모형 S-RAT(Spatial Runoff Assessment Tool)
2.2 토석류 2차원 수치해석모형 RAMMS
2.3 토석류 2차원 수치해석모형 Flo-2D
3. 적용 및 결과
3.1 대상유역
3.2 NSI 정량지수를 이용한 모형의 매개변수 산정
3.3 RAMMS 모형과 Flo-2D 모형의 충격력 비교
4. 결 론
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