The 3D flow mathematical model is set up by using σ coordinate transformation technique. The model is confirmated by the use of water level and flow velocity in survey region,the results indicate that it has a good mass conservation properties.The model is employed to carry out a numercial simulation of the water level changes between upstream and downstream, the velocity distribution of axis section and its nearby when the closure gap width changes from 50 m to 35 m,the results show that the calculation results of 3D flow mathematical model than the physical model obserbation of around 10% are too big,the causes were analyzed in this paper, and the conclusion is that the 3D model is suitable for the river clouser construction of the pubugou hydropower station when the calculation multiplied by 0.95.The results provide a new research method for the hydropower plant closure.
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