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A uniform representation of the mean turbulent velocity profile in the sum ofa wall function and a wake function is applied to an open channel,quantitatively determining its components. The open channel is thus found tocoherently fit in to the same theoretical picture previously drawn for planeCouette, plane closed channel and circular pipe flow, and to share with them auniversal law of the wall and a universal logarithmic law with a common valueof von K\'arm\'an's constant.

Uniform representation of the turbulent velocity profile in an open channel