한국수자원학회논문집 (Journal of Korea Water Resources Association)

  • 제43권1호
  • /
  • Pages.41-49
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  • 2010
  • /
  • 2799-8746(pISSN)
  • /
  • 2799-8754(eISSN)
한국수자원학회 (Korea Water Resources Association)
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계단형 보 하류 흐름특성과 Wave Type Flow에 관한 실험연구

Experimental Study on Flow Characteristic and Wave Type Flow at Downstream of Stepped Weir

  • 강준구 (한국건설기술연구원 하천, 해안항만연구실) ;
  • 여홍구 (한국건설기술연구원 하천, 해안항만연구실) ;
  • 이금찬 (한국건설기술연구원 하천, 해안항만연구실) ;
  • 최남정 (한국건설기술연구원 하천, 해안항만연구실)
  • Kang, Joon-Gu (River, Coastal and Harbor Research Division, Korea Institute of Construction Technology) ;
  • Yeo, Hong-Koo (River, Coastal and Harbor Research Division, Korea Institute of Construction Technology) ;
  • Lee, Keum-Chan (River, Coastal and Harbor Research Division, Korea Institute of Construction Technology) ;
  • Choi, Nam-Jeong (River, Coastal and Harbor Research Division, Korea Institute of Construction Technology)
  • 발행 : 2010.01.31
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초록

본 연구의 계단형 보는 자연형 횡단 구조물의 한 형태로 제안되고 있다. 계단형 보 하류에서의 흐름은 기존 보(Round Crest Weir)에서 발생하는 도수와 달리 WTF(Wave Type Flow)라는 독특한 흐름이 발생한다. WTF는 계단형 보 하류에서 단차로 인해 발생되는 재순환영역(recirculation area)이 일정조건에서 발달하여 수면을 상승시키는 현상이다. WTF 조건에서의 파고는 하류수위(tailwater level) 보다 높아지고 WTF 구간에서의 최대유속발생이 수면에 가까운 곳에서 발생한다. 이와 같은 결과는 WTF 현상이 설계 시 접합부에 영향을 줄 수 있는 중요 인자임을 나타내는 것이다. 본 연구는 수리실험을 통해 WTF이 발생되는 수리조건과 WTF의 규모를 파악하였고 계단형 하류흐름조건에 따른 유속분포를 분석하였다. 본 연구의 결과는 계단형 보 설계 시 고려되지 못한 부분으로서 차후에 계단형 구조물 또는 계단식 변형 구조물 설계 시 주요 자료로 활용 될 것이다.

Stepped weir of this study was suggested a type of natural type structures. Unique flow, such as Wave type flow, at downstream of mild slope stepped occurs. WTF(Wave type flow) is different with hydraulic jump occurred at Round crest weir. WTF is phenomenon to rise the water level by recirculation area occurred by step height at downstream of mild slope stepped. Wave height of WTF condition is higher than tailwater level and maximum velocity of WTF condition occurs in area of water surface. In this results, WTF presents to be important factor for design of join area of weir with levee. This study got and analyzed hydraulic condition occurred of WTF, scales of WTF and velocity profiles on flow patterns using experiments. WTF was not consider to stepped weir design and this results can be important data for design of stepped weir and structures.

키워드

참고문헌

  1. 한국수자원학회 (2005). 하천설계기준․해설. pp. 411-431.
  2. Chanson, H. (2001). “Teaching Hydraulic Design in an Australian Undergraduate Civil Engineering Curriculum”, Journal of Hydraulic Engineering, ASCE, Vol. 127, No. 12. pp. 1002-1008. https://doi.org/10.1061/(ASCE)0733-9429(2001)127:12(1002)
  3. Hager, W. H. and Bretz, N. V. (1986). “Hydraulic Jumps at Positive and Negative Steps.” Journal of Hydraulic Research, Vol. 24, No. 4, pp. 237-253. https://doi.org/10.1080/00221688609499303
  4. Kawagoshi, N., and Hager, W. H. (1990). “Wave type flow at abrupt drops 1. Flow geometry.” Journal of Hydraulic Research, Vol. 28, No. 4, pp. 461-480. https://doi.org/10.1080/00221689009499060
  5. Moore W.L. and Morgan C.W. (1959). “Closure on 'The hydraulic jump at an abrupt drop' by themselves.” Journal of the Hydraulics Division, Proc. ASCE, Vol. 85, No. HY2, pp. 87-91.
  6. Ohtsu, I., and Yasuda, Y., (1987). “Hydraulic Jumps at Positive and Negative Steps.” Journal of Hydraulic Research, Vol. 25, No. 3, pp. 407-413. https://doi.org/10.1080/00221688709499279
  7. Ohtsu, I., Yasuda, Y., and Hashiba, H. (1996). “Incipient Jump Conditions for Flows over a Vertical Sill.” Journal of Hydraulic Engineering, ASCE, Vol. 122, No. 8. pp. 465-469. https://doi.org/10.1061/(ASCE)0733-9429(1996)122:8(465)
  8. Ohtsu, I. and Yasuda, Y., Gotoh, H., (2001). “Hydraulic condition for undular-jump formations.” Journal of Hydraulic Research, Vol. 39, No. 2, pp. 203-209. https://doi.org/10.1080/00221680109499821
  9. Rajaratnam, N. and Ortiz, N. V. (1977). “Hydraulic Jumps and Waves at Abrupt Drops.” Journal of the Hydraulics Division, Proceedings of the American Society of Civil Engineers, Vol. 103, No. HY4, pp. 381-394.

피인용 문헌

  1. Experimental study on the discharge coefficient of slope-type and step-type weirs vol.49, pp.12, 2016, https://doi.org/10.3741/JKWRA.2016.49.12.961
  2. An Experimental Study of Folw Characteristics at the Downstream Depending on Gate Operation of a Sluice Gate vol.13, pp.5, 2013, https://doi.org/10.9798/KOSHAM.2013.13.5.317