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2022 Vol.9, Issue 3 Preview Page

Original Article

Numerical Experiment of Debris Flow and Driftwood Behavior with Entrainment Erosion

연행침식을 고려한 토석류와 유목거동의 수치실험

Tae Un Kang1
,
Chang-Lae Jang2*
,
Ichiro Kimura3
,
Nam Joo Lee4
강 태운1
,
장 창래2*
,
이치로 기무라3
,
이 남주4
1Postdoctoral Researcher, Research Organization of Science and Technology, Ritsumeikan University, Kusatsu-shi, Shiga 525-8577, Japan
2Professor, Department of Civil Engineering, Korea National University of Transportation, Chungju 27460, Korea
3Professor, Faculty of Sustainable Design, University of Toyama, Toyama 930-8555, Japan
4Professor, Department of Civil Engineering, Kyungsung University, Busan 48434, Korea
1Ritsumeikan 대학교 박사후 연구원
2한국교통대학교 건설환경도시교통공학부 교수
3Toyama 대학교 교수
4경성대학교 건설환경도시공학부 교수
*Corresponding Author
30 September 2022. pp. 141-153
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Abstract

In this study, a numerical model of debris flow considering driftwood and entrainment erosion is developed. Subsequently, numerical simulations based on the observation data of the 2011 Mt. Umyeon are performed. To develop the debris flow model, the Nays2DFlood model, which is a flooding model based on the shallow water equation, is coupled with the transport diffusion of mixed sediment concentration, debris flow bottom shear stress, and entrainment erosion modules. The simulation closely reproduced the depth, flow velocity, and debris flow volume of Mt. Umyeon. In addition, the reproducibility of the simulation result with driftwood is more accurate than that without driftwood. The results of this study can facilitate in establishing measures to reduce debris disasters, thus alleviating the current increase in debris damage due to climate change.

Keywords
Debris flow
Driftwood
Entrainment erosion
Hybrid model

본 연구는 유목과 연행침식을 고려한 토석류 수치모형을 개발하여 2011년 발생한 우면산 산사태의 관측데이터를 기반으로 수치모의를 수행하였다. 토석류 모형개발을 위해 천수방정식 기반의 침수모형인 Nays2DFlood 모형에 혼합유사농도의 이송확산, 토석류 지면전단응력, 연행침식 모듈을 추가하였으며 유목생성과 유목거동 모의를 위해 입자법 기반의 유목동력학 모형을 결합하였다. 모의결과, 우면산 산사태로 인한 수심과 유속 및 토석류 체적을 양호하게 재현한 것으로 나타났으며, 유목을 반영한 모의에서 보다 더 정확한 재현성을 나타냈다. 따라서 본 연구의 결과는 현재 기후변화로 인해 토석류 피해가 증가하는 실정에 대응할 수 있는 피해저감방안 구축에 도움이 될 수 있을 것으로 기대된다.

키워드
토석류 흐름
유목
연행침식
하이브리드 모형
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Information
  • Publisher :Korean Society of Ecology and Infrastructure Engineering
  • Publisher(Ko) :응용생태공학회
  • Journal Title :Ecology and Resilient Infrastructure
  • Journal Title(Ko) :응용생태공학회 논문집
  • Volume : 9
  • No :3
  • Pages :141-153
  • Received Date : 2022-08-22
  • Revised Date : 2022-09-15
  • Accepted Date : 2022-09-16
  • DOI :https://doi.org/10.17820/eri.2022.9.3.141
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