토석류 규모 산정과 영향인자와의 상관성 분석
Estimation of Magnitude of Debris Flow and Correlation Analysis Between Influencing Factors
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본 연구에서는 2006년부터 2013년 까지 강원도 영서 인근 지역의 토석류 피해지역 43개소에 대한 현장조사 결과를 바탕으로토석류 규모를 산정하고 영향인자가 토석류 규모에 미치는 상관성 분석을 실시하였다. 토석류의 규모는 발생지역별로 큰차이를 보이나 계곡형이 사면형보다 약 6.5배 큰 것으로 조사되었으며 계곡형 발생부의 토석류 규모는 전체의 약 5% 정도의규모인 것을 확인하였다. 침식률은 계곡형에서 전체 토석류 발생량이 10,000m 3 보다 큰 대규모인 경우 19m 3 /m, 10,000m 3 보다 작은 경우 8m 3 /m의 값을 갖고, 사면형은 5m 3 /m로 산정되었다. 토석류 규모의 영향인자에 대한 상관성 분석결과, 토석류유하부의 길이와 폭은 상관성이 높은 것으로 나타났으며, 평균경사와 침식 깊이는 상관성이 낮은 것으로 나타났다. 특히, 침식깊이는 규모와 상관성 없이 0.5~2.6m의 범위로 Ikeya(1981)가 제안한 값과 유사하였다. 연속강우량, 최대시간강우량 등토석류 유발강우와 토석류 규모는 상관성이 낮은 것으로 분석되었다.
Abstract
In this paper, for 43 sites neighboring to western area of Gangwondo where disaster of debris flow occurred from 2006 to 2013, magnitude of debris flow was estimated from results of site investigation and correlation analysis between influencing factors to its magnitude was performed. Magnitude of channelized debris flow was found greater by 6.5 times of that of hill slope debris flow and approximately 5% of total volume was occurred at initiation part of channelized debris flow. As results of analyzing yield rate of debris flow, for channelized debris flow, yield rate values of 19 m3/m and 8㎥/m were obtained for total volume being over 10,000 m3/m as the large scale of debris flow and less than 10,000 m3/m respectively, and value of 5 m3/m was estimated for hill slope debris flow. As results of correlation analysis of influencing factors to magnitude of debris flow, runoff distance and erosion width were very highly correlated to its magnitude whereas average slope of basin and erosion depth showed relatively low correlation. In particular, value of erosion depth was in the range of 0.5-2.6 m, being similar range to the value proposed by Ikeya (1981). Triggering rainfall to debris flow such as continuous rainfall and maximum intensity of hour rainfall were analyzed to have low correlation with magnitude of debris flow.
참고문헌 (23)
- D'Agostino, V., "Debris Flow Magnitude in the Eastern Italian Alps: Data Collection and Analysis", Physical Chemistry Earth(C), 26(9), pp.657~663 (2001)
- Evans, S. G., "Landslides and Surficial Deposits in Urban Areas of British Columbia: A Review", Canadian Geotechnical Journal, 19(3), pp.269~288 (1982)
- Gartner, J. E., "Empirical Models to Predict the Volumes of Debris Flows Generated by Recently Burned Basins in the Western U.S", Geomorphology, 96(3), pp.339~354 (2008)
- Guthrie, R. H., "An Examination of Controls on Debris Flow Mobility: Evidence from Coastal British Columbia", Geomorphology, 114(4), pp.601~613 (2010)
- Hungr, O., "Entrainment of Material by Debris Flows, in Debris-Flow Hazards and Related Phenomena", pp.135~158 (2005), Springer
- Hungr, O., "Quantitative Analysis of Debris Torrent Hazards for Design of Remedial Measures", Canadian Geotechnical Journal, 21, pp.663~677 (1984)
- Ikeya, H., "A method of Designation for Area in Danger of Debris Flow, In Erosion and Sediment Transport in Pacific Rim Steeplands", Proc. of the Christchurch Symp., Int. Assoc. Hydrol. Sci., Publ., (132), pp.576~588 (1981)
- Iverson, R. M., "The Physics of Debris Flows", Reviews of Geophysics, 35(3), pp.245~ (1997)
- Jakob, M, "A Size Classification for Debris Flow", Engineering Geology, 79, pp.151~161 (2005)
- 장창봉, "토석류의 거동 특성 및 유발강우에 관한 연구", 한국지반환경공학회 논문집, 18(1), pp.13~21 (2017), 한국지반환경공학회
- Jeong, S. S., "Susceptibility Assessment of Landslides under Extreme-rainfall Events Using Hydro-geotechnical Model; A Case Study of Umyeonsan (Mt.), Korea", Nat. Hazards Earth Syst. Sci. Discuss, 2, pp.5575~5601 (2014)
- 전경재, "최근 4년간 국내 사면재해 현장조사를 통한 유발인자 분석", 한국지반공학회논문집, 31(5), pp.47~58 (2015), 한국지반공학회
- Kim, K. S., "Estimation of Debris Flow Magnitude by Flow Track Measurement", Korean Society of Civil Engineers Conference, Korean Society of Civil Engineers, pp.2709~2712 (2013)
- Kim, K. S., "Analysis of Debris Flow Magnitude", Korean Society of Civil Engineers Conference, pp.3015~3018 (2008)
- 김경석, "토석류 발생 지형과 유발 강우 특성 분석", 대한토목학회 논문집C, 28(5), pp.263~271 (2008), 대한토목학회
- Kim, W. Y., "Case Study of Landslide Types in Korea", Korean Society of Engineering Geology, 10(2), pp.18~35 (2000)
- 김영호, "Coupled Eulerian-Lagrangian (CEL) 방법을 이용한 Dynamically Penetrating Anchor의 동적 거동 분석", 대한토목학회논문집(국문), 34(3), pp.895~906 (2014), 대한토목학회[DOI]
- Debris Flow Hazard Mitigation and Countermeasures in Highway, "Korea Expressway Corporation", 12~16 (2007)
- 정상섬, "지반의 침식 및 연행작용을 고려한 토석류 해석 모델 제안", 한국지반공학회논문집, 32(10), pp.17~29 (2016), 한국지반공학회
- Marchi L., "Estimation of Debris Flow Magnitude in the Eastern Italian Alps", Earth Surface Processes and Landforms, 29(2), pp.207~220 (2004)
- McCoy, S. W., "Sediment Entrainment by Debris Flows: In-situ Measurements from the Headwaters of a Steep Catchment", Journal of Geophysical Research:Earth Surface, 117(3), pp.1~25 (2012)
- Revellino, P., "Velocity and Runout Simulation of Destructive Debris Flows and Debris Avalanches in Pyroclastic Deposits, Campania Region, Italy", Environ. Geol., 45(3), pp.295~311 (2004)
- Rickenmann D., "Sediment Loads due to Fluvial Transport and Debris Flows during the 2005 Flood Events in Switzerland", Hydrological Processes, 24, pp.993~1007 (2010)