Numerical Modeling of Free Surface at the Fish Migration Spillways

어류 이동용 여수로의 자유수면 수치해석

  • 이해균 (단국대학교 천안캠퍼스 토목환경공학과)
  • Received : 2010.07.30
  • Accepted : 2010.08.23
  • Published : 2010.08.28


A level-set finite-element method is employed to investigate the free surface flow of two conceptual fish passage designs. While one design has a right-angled entrance from the reservoir to the fish passage chute, the other has a curved-shaped entrance. The numerical results are validated with hydraulic experiments through comparison of the free surface location and the pressure distribution in the spillway. It is observed that the right-angled design yields a curved free surface and pressure distribution in the vicinity of the entrance due to large strains, whereas the curved-shaped design yields a smooth flow transition with small strains. The subatmospheirc pressure distributions near the spillway ogee crest for both designs exhibit similar flow patterns. It is concluded that the curved-shaped design is more favorable for fish passage because of the feature of a smooth flow transition with small strains.


Fish Management;Finite Element Method;Free Surfaces;Spillways


Supported by : 한국건설교통기술평가원


  1. 김대근, 이재형, 서일원, “교각이 설치된 월류형 여수로에서의 흐름에 대한 수치모의”, 한국수자원학회논문집, 제37권, 제5호, pp.675-685, 2004.
  2. 오병동, 김경호, 이환기, 안상도, “FLOW- 3D에 의한 파샬플륨 흐름 해석”, 한국수자원학회논문집, 제37권, 제5호. pp.375-375, 2004.
  3. FLUENT, Inc., FLUENT 6.3 User's Guide, 2003.
  4. M. Gómez-Gesteira and R. A. Dalrymple, "Using a 3D SPH method for wave impact on a tall structure, J. Waterway, Port, Coastal, Ocean Engineering, Vol.130, No.2, pp.63-69, 2004.
  5. C. W. Hirt and B. D. Nichols, "Volume of fluid (VOF) methods for the dynamics of free boundaries," J. Comput. Phys., Vol.39, pp.201-225, 1981.
  6. H. Lee, “Level-Set Finite Element Simulation of Free-Surface Flow,” Doctoral dissertation, The University of Iowa, Iowa City, 2007.
  7. T. C. Lyons, P. E. Haug, P. M. Carrica, and L. J. Weber, “Hydraulic model studies for fish diversion at Wanapum/Priest Rapids development. XXII: Model studies of a future unit fish bypass for Wanapum Dam,” Limited Distribution Rep. No.325, IIHR Hydroscience and Engineering, Iowa City, Iowa, 2005.
  8. S. Osher and J. A. Sethian, “Fronts propagating with curvature-dependent speed: Algorithms based on Hamilton-Jacobi formulations,” J. Comput. Phys., Vol.79, No.1, pp.12-49, 1988.
  9. J. Smagorinsky, "General circulation experiments with the primitive equations I: The basic equations," Mon. Weather Rev., Vol.91, pp.99-164, 1963.<0099:GCEWTP>2.3.CO;2