Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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An Experimental Study for the Empirical Equation to Quantify the Subsidence of Riprap Scour Protection at Downstream of Vertical Drop Structures

연직낙차공 하류부 사석보호공 침하량 산정식에 관한 실험 연구

  • Kim, Chang-Sung (River, Coastal and Harbor Research Division, Korea Institute of Construction Technology) ;
  • Kang, Joon-Gu (River, Coastal and Harbor Research Division, KICT) ;
  • Yeo, Hong-Koo (River, Coastal and Harbor Research Division, KICT) ;
  • Yeo, Woon-Kwang (Dept. of Civil and Environmental Eng., Myongji Univ.)
  • 김창성 (한국건설기술연구원 하천해안항만연구실) ;
  • 강준구 (한국건설기술연구원 하천해안항만연구실) ;
  • 여홍구 (한국건설기술연구원 하천해안항만연구실) ;
  • 여운광 (명지대학교 토목환경공학과)
  • Received : 2010.01.13
  • Accepted : 2010.03.30
  • Published : 2010.05.31
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Abstract

Drop structures that span the entire width of channels are installed to alleviate channel grades and have been constructed widely in Korean rivers. Aprons are normally installed and integrated with drop structures and bed protections are added on the downstream part of aprons to protect both drop structures and aprons. Scour occurring on aprons is reported to provide various habitats such as ripples and pools in natural rivers. This study focuses on the scour characteristics on an apron integrated with a drop structure and the subsidence of a riprap protection. The scour depth on the downstream part of the drop structure is found to increase with the increase of unit discharge; however, to decrease as the tail water depth gets deeper. Based on the experimental measurements, the subsidence of the riprap scour protection is calculated with respect to the thickness of riprap. Finally, the dimensionless empirical equation to quantify the subsidence of the riprap scour protection without filters at downstream of the vertical drop is suggested.

낙차공은 하천의 경사를 완화시키기 위해 설치하는 대표적 횡단구조물로써 국내 하천에서 쉽게 볼 수 있다. 낙차공물받이부(apron)는 낙차공 본체와 일체화된 구조물로 설치하는 것이 일반적이며 물받이부의 하류부에 바닥보호공을 설치하여 낙차공과 물받이를 보호하도록 설계된다. 이에 본 연구에서는 낙차공 물받이부에서의 세굴현상과 사석보호공을 설치함으로써 발생하는 침하량에 대한 실험을 수행하였다. 세굴은 낙차공에 유입되는 유량이 증가함에 따라 세굴심은 증가하지만 낙차공 하류부의 수심이 증가할수록 세굴심은 감소하는 것으로 나타났다. 또한 낙차공 물받이부 사석보호공을 포설두께에 따른침하량을 산정하여 세굴심을 제어하고 구조물의 안전을 확보할 수 있는 가능성을 확인하였으며 최종적으로 필터가 없는 사석보호공의 무차원 침하량 산정식을 제안하였다.

Keywords

References

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