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The effect of wall normal velocity on velocity distribution in unsteady flow has been investigated. We established a modified log-law model by adding the wake-term by Coles and deviation term together to depict the velocity deviation caused from classic log-low model. An empirical formula for deviation-correction factor α has been determined based on the present experimental data, and it yields a good agreement with other published experimental data. Experimental measurements of velocity distributions in unsteady open channel flows have been performed to prove this model.The cause of this addition was discussed and explained, and the theoretical velocity images from the improved model have been compared with the present data, they are well correlated.

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