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Journal of the Korean Society of Hazard Mitigation 2015;15(3):75-82.
Published online June 30, 2015.
토석류 발생지역의 지형적 특성을 고려한 위험도 분석
이준선, 송창근, 김홍택, 이승오
Risk Analysis Considering the Topography Characteristics of Debris Flow Occurrence Area
Jun Seon Lee, Chang Geun Song, Hong Teak Kim, Seoung Oh Lee
Abstract
Recently, debris flow has occurred so frequently due to abnormal heavy rainfall. Although various studies have been conducted to simulate the topographic behavior of debris flow, geometric effect such as the shapes of slope side has been insufficient. In this study, simulations were conducted with FLO-2D, the commercial software to be recommended by FEMA to simulate debris flow. And tar-get geometries are selected as flatbed, square shape, trapezoidal shape and V-shape. Firstly FLO-2D was verified by the comparison with USGS debris flow experiments (Iverson, 2010). The comparisons showed good agreements in term of the velocity range and the propagation length of debris flows. Furthermore, the concept of HAZUS-HM risk analysis was used to assess the vulnerabilities of the structures by the impact of the debris flow. Simulated results were confirmed debris flow behavior to be changed due to the geometry type. Behavior of debris flows were analyzed according to the maximum depth, velocity, propagation length and vulnerabilities of the structures by the debris flow. This study would be practical to provide quantitatively the spatial distribution of hazard caused by debris flow.
Key Words: Debris flow; FLO-2D; HAZUS-HM; Topographic feature
요지
최근 자주 발생하는 집중 호우로 인하여 토석류가 빈번하게 발생하고 있다. 토석류에 관한 다양한 연구가 진행되고 있지만 비탈면의 형상에 따른 위험도 분석에 관한 연구는 아직 미흡한 실정이다. 본 연구에서는 평판형, 사각형, 사다리꼴형, 브이형 등의 4가지 수로 형태에 따른 토석류의 전파길이와 최대 속도 및 최대 두께, 구조적 취약성을 분석하였다. FEMA에서 권장하는 상용프로그램인 FLO-2D를 사용하였으며, USGS의 옥외 대형 실험수로의 실측결과와 모의결과를 비교하여 모형을 검증하였다. 또한 HAZUS-HM 위험도 분석 개념을 도입하여 토석류에 의한 구조물의 취약성 평가와 흐름 지형에 따른 토석류 거동의 특징을 분석하였다. 본 연구는 토석류 발생에 의한 공간적 위험도 분포를 정량적으로 제시하는데 도움이 될 것으로 판단된다.
핵심용어: 토석류; 지형적 특징


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