KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Analyses of Riverbed Changes and Physical Disturbance Evaluations by Weir Installation in a Reach

보의 설치에 따른 하상변동과 물리적 교란평가 분석

  • 최흥식 (상지대학교 건설시스템공학과) ;
  • 이웅희 (상지대학교 대학원 토목공학과)
  • Received : 2013.04.16
  • Accepted : 2014.06.11
  • Published : 2014.08.01
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Abstract

The hydraulic characteristics and the patterns of riverbed change had been analysed by HEC-RAS simulation in a reach of Cheong-mi river with and without weir. The corresponding physical disturbance had been evaluated with the method suggested by K-water (2008). The occurrences of low physical disturbance score coincide with the corresponding high bed changes by weir installation. The effects of physical disturbance coincide with the patterns of riverbed change along river reach which shows riverbed change is the important factor to physical disturbance. In case of installation of additional weirs at up and down stream sections of no disturbance effect by the existing weir, no physical disturbances occur in certain sections with confirming the appearance of the similar disturbance scores between the simulation results of with and without additional weir installations. In case of installation of additional weirs at up and down stream sections of disturbance effect margins by the existing weir, physical disturbances occur at every section. In case of installation of additional weirs at up and down stream sections within disturbance effect by the existing weir, low physical disturbance scores are given at every section because of superposition of disturbance along river reach. The physical disturbance would be minimized such that the additional weir is installed with sufficient distances of no disturbance and bed change effects along river reach.

청미천의 일부구간을 대상으로 HEC-RAS를 이용하여 보의 설치 유무에 따른 수리 및 하상변동 특성을 분석하였다. 한국수자원공사(2008)에서 제시한 방법을 이용하여 물리적 교란을 평가하였다. 보의 설치에 따른 하상변동이 큰 구간에서의 물리적 교란점수는 낮게 나타났다. 보의 설치에 따른 하상변동과 그에 따른 물리적 교란영향 범위는 거의 일치하여 하상변동은 하천에서 물리적 교란을 야기하는 중요한 인자임을 확인하였다. 기존 보에 의한 교란의 영향이 없는 상류와 하류 지점에 추가적인 보를 설치할 때는 일정구간에 보의 설치 이전과 유사한 교란점수로 나타나 추가적인 하천교란이 발생하지 않았다. 교란의 영향범위 상류와 하류의 끝단에 추가적인 보를 설치한 경우 전 구간에 걸쳐 교란의 영향 나타났다. 물리적 교란 영향범위가 중첩되도록 상류와 하류에 추가적인 보를 설치한 경우 물리적 교란양상의 중첩으로 전 구간의 교란점수는 매우 낮게 나타났다. 따라서 하천에서 보의 설치는 하상변동과 교란의 영향범위보다 충분히 떨어진 위치에 설치할 때 하천의 물리적 교란을 최소화할 수 있다.

Keywords

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