Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
권호 표지
DOI QR코드

DOI QR Code

Analyses of Overtopping Velocity using Analytical Solution(Ritter's Solution) of Dam-Break Flow

댐 붕괴흐름의 해석해(Ritter의 해)를 이용한 월파유속 분석

  • Ryu, Yong-Uk (River and Coast Research Division, Korea Institute of Construction Technology) ;
  • Lee, Jong-In (River and Coast Research Division, Korea Institute of Construction Technology) ;
  • Kim, Young-Taek (River and Coast Research Division, Korea Institute of Construction Technology)
  • 유용욱 (한국건설기술연구원 하천.해안연구실) ;
  • 이종인 (한국건설기술연구원 하천.해안연구실) ;
  • 김영택 (한국건설기술연구원 하천.해안연구실)
  • Published : 2008.07.31
Download PDF
⟨ Previous Next ⟩

Abstract

The present study examines similarity of behavior between an overtopping wave generated by a plunging wave and a dam-break flow through hydraulic model tests. The dam-break flow has been employed to estimate the overtopping effect on the basis of the dam-break flow's behavior similar to the overtopping. In this study, the overtopping velocity was measured by a modified image technique using bubble and bubble texture images called bubble image velocitmetry. From the measurements, the vertical profiles of horizontal overtopping velocity at cross-sections along the deck were presented and discussed. Maximum velocity and depth-averaged velocity at each cross-section were compared with an analytical solution solving the dam-break flow, Ritter's solution. The initial water depth of importance for the solution was determined from the tested wave condition and the overtopping measurements. The comparison shows that the solution with the initial water depth estimated using the front velocity of the overtopping wave is in good agreements with the measurements.

본 연구는 수리실험으로 얻어진 권파에 의한 월파수괴의 유속을 댐붕괴흐름과 비교하여 거동의 유사성을 검토하였다. 댐붕괴흐름은 해석해가 간략하고 월파 거동과 유사함으로 인해 월파의 유속산정에 이용되어왔다. 월파는 일반적으로 많은 연행기포로 인해 기존의 유속측정기법을 적용하는데 제한을 받게 되므로, 본 실험에서는 기포나 기포조직모양을 이용한 기포영상유속계를 이용하여 월파 유속을 측정하였다. 실험결과로부터 월파의 유속단면을 검토하였고, 단면의 최대유속과 수심평균유속을 댐붕괴흐름의 1차원 해석해인 Ritter의 해와 비교하였다. 해석해와의 비교를 위해 댐붕괴 전 초기수심을 파랑조건과 월파의 측정값으로부터 유도하였다. 파랑조건으로부터 추정된 붕괴 전 초기 수심을 이용한 해석해는 측정된 유속의 분포형태에 있어서는 차이를 보였으나, 월파수괴의 전면속도로부터 산정된 초기수심을 이용한 해석해는 유속크기의 비교에서 좋은 일치를 보였다.

Keywords

References

  1. 윤광석, 이정규 (2007). “장애물이 없는 평탄지형 제내지에서의 범람홍수파 선단 전파거리 실험식 산정.” 한국수자원학회논문집, 한국수자원학회, 제40권, 제10호, pp. 833-840 https://doi.org/10.3741/JKWRA.2007.40.10.833
  2. 이종태, 한건연 (1992). “댐 붕괴 홍수파 해석을 위한 무차원 홍수추적곡선의 유도.” 대한토목학회논문집, 대한토목학회, 제12권, 제2호, pp. 87-99
  3. 한건연 (1990). “댐의 파괴형태와 하도부 양상에 따른 홍수파의 전달특성 해석에 관한 연구.” 한국수문학회논문집, 한국수문학회, 제23권, 제4호, pp. 467-476
  4. Buchner, B. (1995). “The impact of green water on FPSO design.” Offshore Technology Conference, Houston, 7698, pp. 45-57
  5. Fekken, G., Veldman, A. E. P., and Buchner, B. (1999). “Simulation of green water loadings using the Navier-Stokes equations.” 7th International Conference on Numerical Ship Hydrodynamics, Nantes, 6.3, pp. 1-12
  6. Govender, K., Mocke, G. P., and Alport, M. J. (2002). “Video-imaged surf zone wave and roller structures and flow fields.” Journal of Geophysical Research, Vol. 107C, 3072 https://doi.org/10.1029/2000JC000755
  7. Jansen, P. C. M. (1986). “Laboratory observations of the kinematics in the aerated region of breaking waves.” Coastal Engineering, Vol. 9, pp. 453-477 https://doi.org/10.1016/0378-3839(86)90008-6
  8. Kleefsman, K.M.T., Fekken, G., Veldman, A.E.P., Iwanowski, B., and Buchner, B. (2005). “A volume-of-fluid based simulation method for wave impact problems.” Journal of Computational Physics, Vol. 206, pp. 363-393 https://doi.org/10.1016/j.jcp.2004.12.007
  9. Lauber, G., and Hager, W. H. (1997). “Experiments to dambreak wave: Horizontal channel.” Journal of Hydraulic Research, Vol. 36, pp. 291-307
  10. Ritter, A. (1892). “Die Fortpflanzung der Wasserwellen.” Vereine Deutscher Ingenieure Zeitswchrift, Vol. 36(33), pp. 947-954
  11. Ryu, Y., Chang, K.-A., and Lim, H.-J. (2005). “Use of bubble image velocimetry for measurement of plunging wave impinging on structure and associated greenwater.” Measurement Science and Technology, Vol. 16, pp. 1945-1953 https://doi.org/10.1088/0957-0233/16/10/009
  12. Schoenberg, T. and Rainey, R. C. T. (2002). “A hydrodynamic model of green water incidents.” Applied Ocean Research, Vol. 24, pp. 299-307 https://doi.org/10.1016/S0141-1187(03)00004-X
  13. Schuttrumpf and Oumeraci (2005). “Layer thicknesses and velocities of wave overtopping flow at seadikes.” Coastal Engineering, Vol. 52, pp. 473-495 https://doi.org/10.1016/j.coastaleng.2005.02.002
  14. Vischer, D. L. and Hager, W. H. (1998). Dam Hydraulics, John Wiley and Sons, New York
  15. Yilmaz, O., Incecik, A., and Han, J. C. (2003). “Simulation of green water flow on deck using non-linear dam breaking theory.” Ocean Engineering, Vol. 30, pp. 601-610 https://doi.org/10.1016/S0029-8018(02)00042-2
  16. Zoppou, C. and Roberts, S. (2003). “Explicit schemes for dam-break simulations.” Journal of Hydraulic Engineering, Vol. 129, pp. 11-34 https://doi.org/10.1061/(ASCE)0733-9429(2003)129:1(11)