Author(s): R. Gerard; G. Putz; D. W. Smith

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Abstract: The transverse mixing characteristics of the bank zone downstream of a small bank outfall in a large northern river were measured under both ice covered and open water condi tions. The mixing achieved was substantially less than expected from the existing literature on the subject. The transverse mixing coefficient was determined by comparison of a depth- averaged nunerical simulation o the plume geometry with the geometry measured using a tracer. Although the mixing coefficient i usually assumed to scale on a ver tical dimension of the flow, in this case it was found to scale best on a lateral dimension - the plume width. Implications of this on the distribution of the effective mixing length are discussed. A significant disparity was found between the scaled mixing coefficient for ice covered and open water condi tions. This disparity remains unexplained.

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Year: 1985