대한토목학회논문집 (KSCE Journal of Civil and Environmental Engineering Research)

  • 제26권4B호
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  • Pages.371-378
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  • 2006
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  • 1015-6348(pISSN)
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  • 2799-9629(eISSN)
대한토목학회 (Korean Society of Civil Engeneers)
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만곡수로에서 흐름방향에 따른 2차류의 변화량 산정식

New Equation on Streamwise Variation of Secondary Flow in Meandering Channels

  • 백경오 (한국건설기술연구원) ;
  • 서일원 (서울대학교 공과대학 지구환경시스템공학부) ;
  • 이규환 (현대중공업)
  • 투고 : 2006.01.26
  • 심사 : 2006.06.14
  • 발행 : 2006.07.31
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초록

본 연구에서는 만곡수로에서 주 흐름방향에 따라 변화하는 2차류의 거동을 이론적으로 예측하기 위해 Odgaard(1986) 및 Chang(1988)의 제안을 바탕으로 새로운 방정식을 유도하였다. 개발된 이론식은 2차류의 횡방향 유속을 주 흐름 및 연직방향의 함수로 표현한다. 이를 검증하기 위해 실험실에 사행도가 각기 다른 두 개의 만곡수로를 제작하여 수리실험을 수행하였다. 수리실험결과를 제안된 이론식 및 기존 식과 비교해 보면, 제안된 식은 실측치에 잘 일치하는 반면 기존 식은 과대 산정하는 경향이 있었다. 제안된 이론식을 통해 수리량이 변화는 경우 2차류가 어떻게 변하는지를 확인해 본 결과, 사행도, 조도, 하폭 대 수심비가 클수록 2차류는 증가하였다. 또한 조도 및 하폭 대 수심비의 변화에 따라 2차류의 흐름방향 분포가 민감하게 반응하였다.

In this study, a theoretical equation was derived based on Odgaard (1986) and Chang (1988) to reveal the streamwise variation of the secondary flow in meandering channels. The new equation describes the transverse component of the secondary flow as a function of streamwise and vertical directions. To validate the proposed equation, hydraulic experiments were conducted in laboratory meandering channels having different sinuosity. Comparison of experimental results with the proposed equation and an existing equation revealed that the equation was in good agreement with the measured data. However, the existing equation overestimated the transverse velocity. Investigation of the variation of the secondary flow with respect to hydraulic parameters based on the new equation showed that the secondary flow tended to increase as the sinuosity, the roughness, and the aspect ratio became larger. Also, streamwise profile of the secondary flow was sensitive to variations of the roughness and the aspect ratio.

키워드

과제정보

연구 과제번호 : RAMS 개발

연구 과제 주관 기관 : 과학기술부

참고문헌

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