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Three-dimensional Numerical Analysis of Dam-break Waves on a Fixed and Movable Bed

고정상 및 이동상 수로에서 댐 붕괴파의 3차원 수치해석

  • 김대근 (목포대학교 공과대학 토목공학과) ;
  • 황건 (목포대학교 공과대학 토목공학과)
  • Received : 2010.12.27
  • Accepted : 2011.04.29
  • Published : 2011.08.31

Abstract

This study analyzed the propagation of dam-break waves in an area directly downstream of a dam by using 3D numerical modeling with RANS as the governing equation. In this area, the flow of the waves has three dimensional characteristics due to the instantaneous dam break. In particular, the dam-break flows are characterized by a highly unsteady and discontinuous flow, a mixture of the sharp flood waves and their reflected waves, a mixture of subcritical and supercritical flow, and propagation in a dry and movable bed. 2D numerical modeling, in which the governing equation is the shallow water equation, was regarded as restricted in terms of dealing with the sharp fluctuation of the water level at the dam-breaking point and water level vibration at the reservoir. However, in this 30 analysis of flood wave propagation due to partial dam breaking and dam-break in channels with $90^{\circ}$ bend, those phenomena were properly simulated. In addition, the flood wave and bed profiles in a movable bed with a flat/upward/downward bed step, which represents channel aggradation or degradation, was also successfully simulated.

Acknowledgement

Supported by : 목포대학교

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