Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
권호 표지
DOI QR코드

DOI QR Code

Inflow Characteristics of Debris Flow and Risk Assessment for Different Shapes of Defensive Structure

방어구조물 형상에 따른 토석류의 유입특성과 위험도 평가

  • Oh, Seung Myeong (Department of Safety Engineering, Incheon National University) ;
  • Song, Chang Geun (Department of Safety Engineering, Incheon National University) ;
  • Lee, Seung Oh (School of Urban and Civil Engineering, Hongik University)
  • Received : 2016.03.14
  • Accepted : 2016.12.02
  • Published : 2016.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

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.

Keywords

References

  1. D. Y. Choi and J. C. Paik, "Characteristics of Runout of Debris Flows in Korea", Journal of Korean Society of Civil Engineers, Vol. 32, No. 3, pp. 193-201, 2012. https://doi.org/10.12652/Ksce.2012.32.5C.193
  2. J. H. Kim, Y. S. Lee and K. B. Park, "A Study on Model Experiment for Evaluation of Debris Flow's Impact Force Characteristics", Journal of the Korean Geotechnical Society, Vol. 26, No. 11, pp. 5-15, 2010.
  3. J. H. Seong, S. M. Oh and C. G. Song, "Analysis of Initial Mass Distribution and Facility Shape to Determine Structural Alternative for Hazardous Zone Vulnerable to Debris Flow Disaster", Journal of the Korean Society of Safety, 2016 (in press).
  4. W. I. Choi, S. G. Lee, B. K. Lee and S. J. Jang, "A Study of Vulnerability of Structure by Debris Flow", Journal of the Korean Society of Hazard, Vol. 12, No. 3, pp. 141-146, 2012.
  5. C. Beffa, "Two-Dimensional Modelling of Flood Hazards in Urban Areas." Proc. 3rd Int. Conf. on Hydroscience and Engineering, D-Cottbus, 1988.
  6. H. R. Wallingford, "Flood Hazard Research Centre and Risk and Policy Analysts Ltd", Flood Risk to People, Phase 2, FD2321/TR2, Guidance Document, Defra/Environment Agency Flood and Coastal Defence R&D Programme, 2006.
  7. D. M. Cruden and D. J. Varnes, "Landslide Types and Processes", Landslides Investigation and Mitigation, Transportation Research Board, US National Research Council, Report 247, pp. 36-75, 1996.
  8. I. W. Seo and C. G. Song, "Developement of 2D Finite Element Model for the Analysis of Shallow Water Flow", Journal of Korean Society of Civil Engineers, Vol. 30, No. 2B, pp. 199-209, 2010.
  9. C. G. Song and I. W. Seo, "Numerical Simulation of Convection-dominated Flow Using SU/PG Scheme", Journal of the Korean Society of Civil Engineers, Vol. 32, No. 3, pp. 175-183, 2012.
  10. I. W. Seo, Y. D. Kim, and C. G. Song, "Validation of depth-averaged flow model using flat-bottomed benchmark problems," The Scientific World Journal, Volume 2014, Article ID 197539, 18 pages, DOI: 10.1155/2014/197539.
  11. J. H. Ryu, H. J. Sung, Y. Kim, "A Study on the Major Factors Causing the Sediment Disasters by Case Analysis", Journal of Korean Society of Hazard Mitigation, Vol. 14, No. 6, pp. 151-157, 2014. https://doi.org/10.9798/KOSHAM.2014.14.6.151