한국지반환경공학회 논문집 (Journal of the Korean GEO-environmental Society)

  • 제22권2호
  • /
  • Pages.25-33
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  • 2021
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  • 1598-0820(pISSN)
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  • 2714-1233(eISSN)
한국지반환경공학회 (Korean Geo-Environmental Society)
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실내 모형실험을 통한 토석류 퇴적 특성 연구

A Study on the Deposition Characteristics of Debris Flow Using Small-scaled Laboratory Test

  • Chang, Hyungjoon (School of Civil Engineering, Chungbuk National University) ;
  • Ryou, Kukhyun (School of Civil Engineering, Chungbuk National University) ;
  • Lee, Hojin (School of Civil Engineering, Chungbuk National University)
  • 투고 : 2020.12.10
  • 심사 : 2021.01.28
  • 발행 : 2021.02.01
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초록

본 연구는 토석류의 퇴적 특성을 파악하고 소단을 설치함에 따른 토석류 피해의 저감효과를 분석하기 위해 수행되었다. 다양한 수로경사 및 토사체적농도를 고려하여 수로실험을 수행하였으며, 소단 설치에 따른 토석류 피해의 저감효과를 분석하기 위해 소단을 설치하지 않은 경우와 소단을 설치한 경우를 비교하였다. 본 연구에서는 토석류의 퇴적 특성 중 도달거리, 총 이동거리 및 이동비에 대한 분석을 진행하였다. 먼저 수로경사 변화에 따른 토석류의 퇴적 특성을 분석하였고, 토사체적농도 변화에 따른 토석류의 퇴적 특성을 분석하였다. 또한, 소단을 설치하지 않은 경우를 기준으로 소단을 설치한 경우의 퇴적 특성 변화율을 산정하였다. 실험결과, 수로경사와 토사체적농도가 토석류의 퇴적 특성에 상당한 영향을 미치는 것을 확인하였다. 또한, 사면에 소단을 설치할 경우 토석류의 도달거리와 이동비가 크게 감소하였으며, 총 이동거리가 증가하였다. 이는 소단을 설치하는 것이 토석류의 이동을 지연시키고, 토석류의 잠재적인 이동성을 감소시키는 것을 의미한다. 본 연구의 결과는 토석류의 퇴적 특성을 이해하는 데 유용한 정보를 제공할 것이며, 나아가 소단의 설계에 도움을 줄 것으로 기대된다.

This study was conducted to understand the deposition characteristics of debris flow and to analyze the reduction effect of debris flow damage by installing a berm. Flume experiments were performed in consideration of various channel slope and volumetric sediment concontration. In order to analyze the reduction effect of debris flow damage by installing a berm, the cases of not installing a berm and the cases of installing a berm were compared. In this study, the runout distance, total travel distance, and mobility ratio were analyzed among the deposition characteristics of debris flow. First, the deposition characteristics of debris flow according to the change of the channel slope were analyzed, and the deposition characteristics of debris flow due to the change of volumetric sediment concentration were analyzed. In addition, the change rate of debris flow deposition characteristics when a berm was installed was calculated based on the case when a berm was not installed. As a result of the experiments, it was confirmed that the channel slope and volumetric sediment concentration had a significant effect on the deposition characteristics of debris flow. In addition, when a berm is installed on the slope, the runout distance and mobility ratio of debris flow are greatly decreased, and the total travel distance is increased. This means that installing a berm delays the movement of debris flow and reduces the potential mobility of debris flow. The results of this study will provide useful information for understanding the deposition characteristics of debris flow. Furthermore, it is expected to help in the design of a berm.

키워드

참고문헌

  1. 국토교통부 (2016), 수자원장기종합계획 (2001-2020): 제 3차수정계획, 국토교통부.
  2. 이창우 (2014), 산지토사재해 방재시스템 개발 및 활용, 국립산림과학원.
  3. Archetti, R. and Lamberti, A. (2003), Assessment of risk due to debris flow events, Natural Hazards Review, Vol. 4, No. 3, pp. 115-125. https://doi.org/10.1061/(ASCE)1527-6988(2003)4:3(115)
  4. Costa, J. E. (1984), Physical geomorphology of debris flows, developments and applications of geomorphology, Costa, J. E. and Fleisher, P. J., eds., Springer, Berlin, pp. 268-317.
  5. D'Agostino, V., Cesca, M. and Marchi, L. (2010), Field and laboratory investigations of runout distances of debris flows in the Dolomites (Eastern Italian Alps), Geomorphology, Vol. 115, No. 3, pp. 294-304. https://doi.org/10.1016/j.geomorph.2009.06.032
  6. de Haas, T., Braat, L., Leuven, J. R. F. W., Lokhorst, I. R. and Klelnhans, M. G. (2015), Effects of debris flow composition on runout, depositional mechanisms, and deposit morphology in laboratory experiments, Jounal of Geophysical Research: Earth Surface, Vol. 120, No. 9, pp. 1949-1972. https://doi.org/10.1002/2015JF003525
  7. Eu, S. (2016), Analysis of debris flow behavior with flume experiments, Master's thesis, Seoul National University (In Korean).
  8. Fairfield, G. (2011), Assessing the dynamic influences of slope angle and sediment composition on debris flow behaviour: An experimental approach, Master's thesis, Durham University.
  9. Hu, H., Zhou, G. G. D., Song, D., Cui, K. F. E., Huang, Y., Choi, C. E. and Chen, H. (2020), Effect of slit size on the impact load against debris-flow mitigation dams, Engineering Geology, Vol. 274, No. 5, pp. 105764. https://doi.org/10.1016/j.enggeo.2020.105764
  10. Iverson, R. M. (1997), The physics of debris flows, Reviews of Geophysics, Vol. 35, No. 3, pp. 245-296. https://doi.org/10.1029/97RG00426
  11. Johnson, C. G., Kokelaar, B. P., Iverson, R. M., Logan, M., LaHusen, R. G. and Gray, J. M. N. T. (2012), Grain-size segregation and levee formation in geophysical mass flows, Journal of Geophysical Research: Earth Surface, Vol. 117, No. F1, pp. 1-23.
  12. Jun, B. H., Jun, K. W. and Jang, C. D. (2012), A study on development of debris flow experimental equipment for mountainous disaster, Crisisonomy, Vol. 8, No. 3, pp. 137-146 (In Korean).
  13. Kim, J. H., Lee, Y. S., Cho, G. T. and Choi, W. H. (2009), Model experiment for calculation of debris flow's shock force (Use dry materials), Proceedings of International Symposium on Urban Geotechnics, Korean Geotechnical Society, pp. 1271-1274 (In Korean).
  14. Kim, S. D., Oh, S. W. and Lee, H. J. (2013), The study of relationship between berm width and debris flow at the slope, Journal of the Korean Geo-Environmental Society, Vol. 14, No. 11, pp. 5-12 (In Korean). https://doi.org/10.14481/jkges.2013.14.12.005
  15. Kurovskaia, V. A., Sokolova, D. P., Ostashov, A. A. and Vinogradova, T. A. (2019), Comparison of debris flow characteristics obtained by using video materials and modeling, Open Journal of Geology, Vol. 9, No. 2, pp. 75-88. https://doi.org/10.4236/ojg.2019.92007
  16. Kwon, J. h. (2013), Model experimental study with consideration for grain composition of debris flows in Korea, Master's thesis, Seokyong University (In Korean).
  17. Lee, H. J., Kim, S. D., Jun, K. W. and Lee, M. S. (2015), The modeling of debris flow disaster according to the location of berm, Crisisonomy, Vol. 11, No. 9, pp. 105-118 (In Korean).
  18. Li, P., Wang, J., Hu, K. and Wang, F. (2020), Experimental study of debris-flow entrainment over stepped-gradient beds incorporating bed sediment porosity, Engineering Geology, Vol. 274, No. 5, pp. 105708. https://doi.org/10.1016/j.enggeo.2020.105708
  19. Proske, D., Suda, J. and Hübl, J. (2011), Debris flow impact estimation for breakers, Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards, Vol. 5, No. 2, pp. 143-155. https://doi.org/10.1080/17499518.2010.516227
  20. Rickenmann, D. (1999), Empirical relationships for debris flows, Natural Hazards, Vol. 19, pp. 47-77. https://doi.org/10.1023/A:1008064220727
  21. Takahashi, T. (2014), Debris flow: mechanics, prediction and countermeasures, 2nd edition, CRC Press, Leiden.
  22. Tan, D., Yin, J., Qin, J., Zhu, Z. and Feng, W. (2020), Experimental study on impact and deposition behaviours of multiple surges of channelized debris flow on a flexible barrier, Landslides, Vol. 17, No. 10, pp. 1577-1589. https://doi.org/10.1007/s10346-020-01378-7
  23. Wendeler, C., Volkwein, A., McArdell, B. W. and Bartelt, P. (2019), Load model for designing flexible steel barriers for debris flow mitigation, Canadian Geotechnical Journal, Vol. 56, No. 6, pp. 893-910. https://doi.org/10.1139/cgj-2016-0157
  24. You, B. O., Song, P. H. and Jung, C. G. (2006), Case study on debris flows during heavy rain in Inje, Yangyang and Pyeongchang Areas during 15-17, July, 2006, Korean Geotechnical Society Fall Conference, Korean Geotechnical Society, pp. 615-625 (In Korean).