This is of interest to anyone who needs to measure steep gradient streams. “Experimental flows have a nearly logarithmic velocity profile far above the bed; flow velocity decreases less than logarithmically toward the bed and is nonzero at the bed surface.” ; “Near-bed turbulent fluctuations decrease for shallow, rough flows and scale with the depth-averaged flow velocity rather than bed shear velocity.” This improved understanding of factors affecting vertical velocity profiles is important for extrapolating flow into the unmeasured zones for ADCP measurements and will become increasingly important for newly emerging surface velocity measurement techniques.

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