Evaluating Stability and Functionality of Hybrid Erosion Control Dam for Reducing Debris Flow Damage in Forested Catchment Nearby Urban Area
2018
Kim, K., National Institute of Forest Science, Seoul, Republic of Korea | Kim, D., National Institute of Forest Science, Seoul, Republic of Korea | Seo, J., National Institute of Forest Science, Seoul, Republic of Korea | Lee, C., National Institute of Forest Science, Seoul, Republic of Korea | Woo, C., National Institute of Forest Science, Seoul, Republic of Korea | Kang, M., National Institute of Forest Science, Seoul, Republic of Korea | Jeong, S., Yeonsei University, Seoul, Republic of Korea | Lee, D., Forest Professional Engineer Office Kanglim, Yongin, Republic of Korea
The objective of this study was to develop erosion control dam for preventing disaster in consideration of characteristics of forested catchment near urban area, and to assess its stability and functionality to see its practicability in the field. Two types of hybrid erosion control dams were developed including debris flow prevention dam by using pillar and float board screen type and debris flow control dam by using groyne. Also, review about their static (sliding, overturning, bearing capacity) and dynamic (member force) stability was carried out. According to the result, most of the assessed items met standard safety level although there were some cases where assessed items were short of stability criteria against impact. Also, after miniature flume experiments based on the developed erosion control dam to prove structure function (material catch, deposit), it turned out the dam decreased flow sediment amount and velocity while increasing sediment-capturing capacity by 3.5 times on average compared to the one controlled without erosion control dam. When function of erosion control dam for forested catchment near urban area is quantified based on future flume experiments in a variety of conditions, the dams can be practically used in the urban area, contribution to effectively reducing debris flow damage.
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