This paper reports laser-Doppler anemometer measurements of mean velocity and turbulence statistics upstream and downstream of a 3-mm forward facing step in a shallow open channel flow. The Reynolds numbers based on the momentum thickness (θ) of the approaching upstream flow and step height (h) are in the range and respectively. Measurements are obtained at 50 step heights upstream of the leading edge of the step and downstream of the step. The results show that the overlap region develops more slowly than the inner and outer regions. The mean field recovers at Distributions of the turbulence intensity tend to become self-similar for but the profiles do not necessarily collapse onto the upstream profiles.
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