Mixing in River Underflow
Publication: Journal of Hydraulic Engineering
Volume 113, Issue 6
Abstract
Data is presented detailing the water motion in the Wellington Reservoir induced by the outflow from the valve at the base of the dam wall. This outflow system establishes a simple horizontal shear flow longitudinally along the axis of the reservoir, the characteristics of which are determined by the three‐dimensional sink flow dynamics at the valve. The associated gradient Richardson number of this flow is 11.2; the vertical mass diffusion coefficient, estimated from temperature measurements, is and the energy dissipation, obtained from microstructure profiles, is around Together these measurements imply a flux Richardson number of 0.28. The large value of the gradient Richardson number computed from the sink flow velocity profile suggests that this mean velocity shear was augmented by a field of internal waves, which locally lowered the gradient Richardson number below the critical values.
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Published In
Journal of Hydraulic Engineering
Volume 113 • Issue 6 • June 1987
Pages: 697 - 715
Copyright
Copyright © 1987 ASCE.
History
Published online: Jun 1, 1987
Published in print: Jun 1987
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