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The observation of dam break flows over a wet bed is numerically considered in this paper.The dam break flow process is modelled by a sudden gate release.A Constrained Interpolation Profile (CIP)-based model is employed to solve the Navier-Stokes equations with free surface boundary condition to deal with the water-air-gate interactions.The movable gate is simulated by an immersed boundary, and a gate motion formula is derived from existing experimental data and applied in the dam break flow computations.In order to trace motion of reservoir water and downstream water, a two-liquid-phase model based on the VOF-typed THINC/SW method is used to capture the free surface.The difference between the water profiles with/without gate motion is examined.The numerical results show that the proposed gate motion formula correlates well with the numerical modelling, and the gate motion has a significant influence in the water collapse process and cannot be neglected in the study of dam break.