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The Experimental Study for Variance of Depositation Due to Sediment Volume Concentration of Debris Flow

토석류의 토사체적농도에 따른 퇴적 특성 변화에 관한 실험 연구

Youngdo Choi1
,
Sungduk Kim2
,
Hojin Lee3*
최 영도1
,
김 성덕2
,
이 호진3*
1Graduated Student, School of Civil Engineering, Chungbuk National University
2Instructor, Division of Human&Environmental Design, Cheongju University
3Professor, School of Civil Engineering, Chungbuk National University
1충북대학교 토목공학과 대학원생
2청주대학교 휴먼환경디자인학부 강사
3충북대학교 토목공학부 교수
*Corresponding Author
30 September 2022. pp. 15-21
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Abstract

The purpose of this study is to investigate the sedimentation area and runout distance in the downstream when debris flow occurred on a mountain slope through an experimental performance. Super typhoons and torrential rains caused by climate change cause large-scale debris flow disasters in the downstream areas of mountainous areas, mainly where sediments are deposited and flowed downstream. To analyze the characteristics of the sediment deposited downstream, the disposition area and runout distance were investigated through experiments in the case of a straight channel and channel with berm, respectively. As experimental conditions, changes in sediment volume concentration and channel slope, and channel with or without berm, reduction rates in sedimentation area and runout distance were investigated. In the straight channel, the steeper the channel slope and the lower the sedimentation concentration, the sedimentation area and runout distnace were increased. In a channel with berm, the runout distance and sediment area increased as the slope became steeper and the sediment area decreased.

Keywords
Climate change
Super typhoon
Berm
Deposition area
Runout distance

본 연구의 목적은 산지 사면에서 토석류가 발생했을 때, 하류에서 토사퇴적면적과 도달거리를 실험을 통해 조사한 것이다. 하류에 퇴적하는 토사의 특성을 분석하기 위하여 수로사면에 소단을 설치하였을 경우 또는 직선 수로인 경우 토사퇴적면적과 도달거리를 실험을 통해 분석하였다. 실험조건으로서는 토사체적농도의 변화 및 수로의 경사변화 그리고 수로의 형태에 따라서 토사퇴적면적과 도달거리의 감소율을 조사하였다. 직선수로에서 수로경사가 급할수록 그리고 토사퇴적농도가 감소할수록 토사퇴적면적과 도달거리는 증가하였다. 소단을 갖는 수로에서는 경사가 급할수록 토사퇴적농도가 감소할수록 도달거리 및 토사퇴적농도가 증가하였다. 두 수로에서 토사퇴적면적과 도달거리의 차단율을 비교해보면, 소단을 갖는 수로에서 직선수로인 경우보다 토사퇴적면적과 도달거리의 차단율이 더 높았다. 본 연구의 결과는 급경사지 비탈면에서 토석류가 발생했을 때 효율적인 토석류 저감 또는 방어 대책을 세워 토석류에 의한 피해를 줄이는 데 정보를 제공할 것이다.

키워드
기후변화
슈퍼태풍
소단
토사퇴적면적
도달거리
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Korean References Translated from the English

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Information
  • Publisher :Korean Society of Disaster and Security
  • Publisher(Ko) :한국방재안전학회
  • Journal Title :Journal of Korean Society of Disaster and Security
  • Journal Title(Ko) :한국방재안전학회 논문집
  • Volume : 15
  • No :3
  • Pages :15-21
  • Received Date : 2022-09-13
  • Revised Date : 2022-09-13
  • Accepted Date : 2022-09-20
  • DOI :https://doi.org/10.21729/ksds.2022.15.3.15
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