Journal of the Korean Society of Hazard Mitigation (한국방재학회 논문집)

Korean Society of Hazard Mitigation (한국방재학회)
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Prediction of the Debris Flow-Prone Area in the Hilly District within Urban

도시내 산지의 토석류 위험구역 예측

  • Received : 2015.04.24
  • Accepted : 2015.05.21
  • Published : 2015.06.30
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Abstract

As casualties are increased due to a landslide recently, it is emphasized that the division of a dangerous area from sediment disaster, specially in an urban area, is getting important. The aim of this study is to redefine how to delineate debris flow-prone area based on the hydrological micro-topography analysis techniques and to enhance the cognitive of residents on that risk in an urban mountainous area. As the results, movable sediment ($V_{ec}$) is excessively larger than the erosional sediment ($V_e$), the range of runout distance is in order of using spread angle($L_3$), set lowest part of the debris flow-prone area($L_h$), using stream length($L_1$), empirical formula($L_2$). But the maximum distance is in $(L_1)<(L_2)<(L_h)<(L_3)$. Therefore, the value of ($L_1$), ($L_2$) are proper in urban area, it was projected to be more proper that the value of ($L_3$) and ($L_h$) applicate in bigger watershed and lower development part. The method of hydrological micro-topography analysis is likely to contribute to strengthening the activity of social disaster prevention by enabling the self-diagnostic determination of inhabitants on dwelling areas.

최근 토사재해로 인한 인명피해가 증가함에 따라 도시 내 산지의 토석류 위험구역 지정과 공표 필요성이 강조되고 있다. 이 연구에서는 주민들의 토사재해 위험 인지를 강화하기 위해 수문 미지형 분석 기법을 바탕으로 토석류 미발생 도시산지를 대상으로 재해위험지를 획정하는 방안을 검토하였다. 운반가능토사량($V_{ec}$)은 침식가능 토사량($V_e$)에 비해 과대치를 나타냈고, 도달거리의 범위는 확산각을 이용한 도달거리($L_3$), 재해위험이 있는 최하류 밑단부 설정에 의한 도달거리($L_h$), 최장유로의 길이를 이용한 도달거리($L_1$), 경험식을 이용한 도달거리($L_2$) 순이나, 최대 도달거리는 $(L_1)<(L_2)<(L_h)<(L_3)$로 나타나 기 개발된 도시에서는 ($L_1$) 및 ($L_2$) 값을 적용하는 것이 보다 현실적인 것으로 파악되었다. ($L_2$)와 ($L_h$)는 상대적으로 대유역 저개발지역에 적용하는 것이 더 적합할 것으로 예상된다. 이 연구에서 도입한 수문 미지형 기반의 방법은 주민의 자가진단적 토석류 위험구역 판별을 가능하게 하여 사회적 방재활동 강화에 기여할 것으로 판단된다.

Keywords

Acknowledgement

Supported by : 국토교통과학기술진흥원, 산림청

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