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2016 Vol.49, Issue 6 Preview Page
Estimation methods of maximum scour depth in steep gravel-bed bend channel

급경사 자갈하상 만곡수로의 최대세굴심 산정공식 평가

Jaewoong Choa,b
,
A-Reum Namc
,
Tae Young Wood
,
Sang Deog Parka*
조 재웅a,b
,
남 아름c
,
우 태영d
,
박 상덕a*
aDept. of Civil Eng., Gangneung Wonju National University
Dept. of Disaster Prevention, National Disaster Management Research Institute
cRiver&Tech Co., 1113-ho, Doosan Venture Digm
dDept. of Institute of Technology, BAU Consultant Co., LTD
a강릉원주대학교 토목공학과
국립재난안전연구원 방재연구실
c(주)리버앤텍
d(주)바우컨설탄트 기술연구소
*교신저자. *Corresponding Author. 
30 June 2016. pp. 529-536
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Abstract

The existing methods to estimate the maximum scour depth in the bend of steep gravel bed channel have been evaluated by the hydraulic movable-bed experiments. In the 90° bend steep-slope channel paved with the fluvial gravels which are uniform in size and have a mean diameter of 43mm, the maximum scour depths due to the flow discharge and the gradient of bed slope have been investigated and compared with the scour depth computed from the equations. The local scour has occurred in conditions that the bed slope is steeper than 0.02 and the Fr is greater than 0.95. Except Lacey’s equation and Zeller’s equation, the existing methods computing the maximum scour depth overestimate the maximum scour depth in the steep channel with the very coarse gravel bed. However, Lacey’s equation with the bed material size and Zeller’s equation considering the approach channel gradient and the bend angle may be relatively used to estimate the scour depth in bend of the steep gravel-bed river.

Keywords
Channel bend
Scour depth
Steep channel
Gravel riverbed
Hydraulic experiment

본 연구는 급경사 자갈하상 만곡수로의 이동상 수리실험을 이용하여 만곡부 최대세굴심 산정공식들의 적용성을 평가하였다. 평균입경 43mm의 하천자갈을 90° 만곡 급경사 개수로에 포설하고 유량과 하상경사에 따른 만곡부의 최대세굴심을 조사하고 세굴심 공식으로 산정한 최대세굴심과 비교하였다. 자갈하상 만곡부 국부세굴은 유입부의 하상경사 0.02이상 Fr 0.95이상에서 발생하였다. 이 수로에서 Lacey공식과 Zeller공식을 제외한 기존 세굴심 산정공식들은 최대세굴심을 과대 추정하는 것으로 나타났다. 하상재료를 고려한 Lacey공식과 접근경사와 만곡도를 반영한 Zeller공식은 급경사 자갈하상 만곡부의 최대세굴심 평가에 적용될 수 있는 것으로 판단된다.

키워드
만곡부
세굴심
급경사 수로
자갈하상
수리실험
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 49
  • No :6
  • Pages :529-536
  • Received Date : 2015-12-06
  • Revised Date : 2016-01-12
  • Accepted Date : 2016-03-31
  • DOI :https://doi.org/10.3741/JKWRA.2016.49.6.529
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