Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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The Effectiveness of Overflow Improvement of Broad-Crested Side Weirs according to Installing a Hydraulic Structure

보 설치에 따른 광정횡월류위어의 월류량 개선 효과

  • Kang, Ho Seon (Dept. of Civil & Engineering., Ulsan University) ;
  • Cho, Hong Je (Dept. of Civil & Engineering., Ulsan University)
  • 강호선 (울산대학교 대학원 건설환경공학부) ;
  • 조홍제 (울산대학교 공과대학 건설환경공학부)
  • Received : 2014.11.10
  • Accepted : 2015.05.11
  • Published : 2015.07.31
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Abstract

In this study, the effectiveness of overflow improvement of weir was tested by conducting hydraulic experiments at the designated spot for installment of side weir under the condition of installment of hydraulic structures such as small reservoir in mainstream. The height of the reservoir was set up as a third of that of the weir, accordingly the rate of the height of the weir and the distance of the reservoir from the weir($B_h/L_b$) were 0.05, 0.025, 0.0167 each. As a result, overflows per unit width increased by 8.1%, 5.4% and 3.9% perspectively. A new discharge coefficient that adds $B_h/L_b$ as parameter to the existing discharge coefficient of trapezoidal broad crested side weir was suggested and the application of the new formula of discharge coefficient by comparing measured overflow with calculated overflow was identified.

본 연구에서는 광정횡월류위어 설치 예정지 하류쪽 본류 흐름내에 소규모 보를 설치하는 경우, 위어의 월류량 개선효과를 수리실험을 통해 확인하였다. 위어는 선행연구를 통해 월류량 소통능력이 가장 우수한 것으로 확인된 1 : 1 사다리꼴 형상의 광정횡월류위어를 사용하였다. 위어높이와 수로높이는 각각 0.06 m와 0.2 m이고, 예비실험을 통해 보의 높이를 광정횡월류위어높이의 1/3인 0.02 m로 결정하였다. 하류쪽에 설치되는 보가 위어로 부터 떨어지는 거리에 대한 보의 높이의 비($B_h/L_b$)가 0.05, 0.025, 0.0167인 경우 월류량의 변화를 분석하였다. 보의 위치가 위어에 가까울수록 단위폭당 월류량이 많아졌으며, 각 8.1%, 5.4% 및 3.9% 증가하는 것으로 나타났다. 기존의 광정횡월류위어 유량계수식에 $B_h/L_b$를 매개변수로 추가하여 새로운 유량계수식을 제시하였다. 또한 선행연구 및 기존 연구자들의 실험자료와 본 실험의 연구자료를 비교하였으며, 측정된 월류량과 계산된 월류량을 비교하여 새롭게 제안하는 유량계수식의 적용성을 확인하였다.

Keywords

References

  1. Borghei, S.M., Jalili, M.R., and Ghodsian, M. (1999). "Discharge coefficient for sharp-crested side weir in subcritical flow." Journal of Hydraulic Engineering, ASCE, Vol. 125, No. 10, pp. 1051-1056. https://doi.org/10.1061/(ASCE)0733-9429(1999)125:10(1051)
  2. Cheong, H.F. (1991). "Discharge coefficient of lateral diversion from traperzoidal channel." Journal of Hydraulic Engineering, ASCE, Vol. 117 No. 4, pp. 461-475.
  3. Cho, H.Je., and Kang, H.S. (2011). "An Estimation of Discharge Coefficient Considering the Geometrical Shape of Broad Crested Side Weir." Journal of Korea Water Resources Association, KWRA, Vol. 44, No. 12, pp. 955-965. https://doi.org/10.3741/JKWRA.2011.44.12.955
  4. De March, G. (1934). "Essay on the performance of lateral weirs." L'Energia Elettrica, Vol. 11, No. 11, pp. 849-860.
  5. Hager, W.H. (1987). "Lateral outflow over side weirs." Journal of Hydraulic Engineering, ASCE, Vol. 113, No. 4, pp. 491-504. https://doi.org/10.1061/(ASCE)0733-9429(1987)113:4(491)
  6. Jalili, M.R., and Borghei, S.M. (1996) Discussion of "Discharge coefficient of rectangular side weir", by Singh, D. Manivannan and T. Satyanarayana. Journal of irrigation and drainage engineering, ASCE, Vol. 122, No. 2, pp. 132. https://doi.org/10.1061/(ASCE)0733-9437(1996)122:2(132)
  7. Kim, D.G., and Kim, Y.G. (2007). "Analysis of the Flow over Broad Crested Side Weir by Using Three-Dimensional Numerical Simulation." Journal of Korea Water Resources Association, KWRA, Vol. 41, No. 5, pp. 483-489. https://doi.org/10.3741/JKWRA.2008.41.5.483
  8. Lee, K.L., and Holey, E.R. (2002). Physical modeling forside-channel weirs. CRWR Online Report 02-2, Houston, TX, USA.
  9. Onitsuka, K., Akiyama, J., Mataga, M., and Tsunematsu, T. (2005). Discharge coefficient of side-weir with zero height in subcritical open-channel flows. Abstracts of XXXI IAHR Congress, Seoul, Korea, pp. 2508-2516.
  10. Park, M.H., and Rhee, D.S. (2010). "Development of Discharge Formula for Broad Crested Side Weir." Journal of Korea Water Resources Association, KWRA, Vol. 43, No. 6, pp. 525-531. https://doi.org/10.3741/JKWRA.2010.43.6.525
  11. Ranga Raju, K.G., Prasad, B., and Gupta, S.K. (1979). "Side weir in rectangular channel." Journal of Hydraulics Division, ASCE, Vol. 105, No. 5, pp. 547-554.
  12. Singh, R., Manivannan, D., and Satyanarayana, T. (1994). "Discharge coefficient of rectangular side weirs." Journal of Irrigation and Drainage Engineering, ASCE, Vol. 120, No. 4, pp. 814-819. https://doi.org/10.1061/(ASCE)0733-9437(1994)120:4(814)
  13. Song, J.W., Park, S.S., and Kim, J.H. (2007). "An Estimation of Discharge Coefficients with the Variations of Side Weir Shape." Journal of Korea Water Resources Association, KWRA, Vol. 40, No. 1, pp. 51-62. https://doi.org/10.3741/JKWRA.2007.40.1.051
  14. Subramaya, K., and Awasthy, S.C. (1972). "Spatially varied flow over side-weirs." Journal of Hydraulics Division, ASCE, Vol. 98, No. 1, pp. 1-10.
  15. Yoon, Y.B., and Cho, H.J. (2011). "An Estimation of discharge Coefficient for Broad Crested Side Weir." Journal of the Korean Society of Civil Engineers, KSCE, Vol. 31, No. 1B, pp. 63-70.