Effect of Land Slope on Propagation due to Debris Flow Behavior

Title & Authors
Effect of Land Slope on Propagation due to Debris Flow Behavior
Lee, Jun Seon; Song, Chang Geun; Kim, Hong Teak; Lee, Seung Oh;

Abstract
As sudden rainfall has happened, the debris flow has occurred in the mountain area. Recently sudden rainfall occurred so frequently caused by abnormal climate. Thus debris flow hazard had consecutively increased damage because of debris flow. Recently, Enormous damage due to debris flow have occurred in Korea. Various studies have been conducted to prevent search debris flow hazard. This study was carried out for debris flow behavior according to the land slope on propagation. It is the important one among factors that are related to the propagation over the city with respect to debris flow discharge and depth. For the numerical simulations in this study, the land slope was varied of 5, 0, $\small{-5^{\circ}}$ to investigate the debris flow behavior with the FLO-2D, often recommended by FEMA to simulate debris flow. To verify the performance of FLO-2D, comparison with the USGS experiments (Iverson et al, 2010) was conducted. From numerical results the propagation length of the debris flow was found the most sensitive one. Maximum of debris flow thickness and velocity and structural vulnerabilities were investigated to the effect of land slope. They was became smaller according to land slope of 5, -5, $\small{0^{\circ}}$ in the order. As a result, debris flow behavior analysis about the effect of the land slope could contribute to understand the vulnerability of city for debris flow hazards.
Keywords
debris flow;FLO-2D;structural vulnerability;land slope;
Language
Korean
Cited by
References
1.
Korea Forest Service, "The number of Erosion Control ProJect in Korea", (http://www.forest.go.kr/newkfsweb/ html/HtmlPage.do?pg=/lsis/UI_LSIS_1000_050102.html&orgId=lsis&mn=KFS_02_06_05_01_02), 2014.

2.
Korea Forest Service, "Landslide Hazard Map", (http://sansatai.forest.go.kr/forecast/GISMapView.ls), 2012.

3.
M. J. Lee and Y. T. Kim, "Movement and Deposition Characteristics of Debris Flow according to Rheological Factors", Vol. 29, No. 5, pp. 19-27, 2013.

4.
P. Tarolli and A. Righetto, "Regional Scale Analysis of the Topographic Signatures of Landslide/debris Flow Dominated Processes", In EGU General Assembly Conference Abstracts", Vol. 14, pp. 9865, 2012.

5.
J. S. O'Brien, "FLO-2D User's Manual, Version 2006.01. FLO Engineering: Nutrioso", 2006.

6.
R. M. Iverson, M. Logan, R. G. LaHusen and M. Berti, "The Perfect Debris Flow? Aggregated Results from 28 Large-Scale Experiments", Journal of Geophysical Research: Earth Surface ", Vol. 115, No. F3, 2010.

7.
E. D. Haugen and A. M. Kaynia, "Vulnerability of Structures Impacted by Debris Flow, Landslides and Engineered Slopes", Taylor & Francis, London, pp. 381-387. 2008.

8.
W. I. Choi, S. G. Lee, B. K. Lee and S. J. Jang, "A Study of Vulnerability of Structure by Debris Flow", Journal of Korean Society of Hazard Mitigation", Vol. 12, No. 3, 2012.

9.
HAZUS-MH, F. E. M. A. Flood Model: Technical Manual, Federal Emergency Management Agency, 2013.