Author(s): J. S. Gulliver; M. Halverson
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Keywords: No Keywords
Abstract: The moving-bed flume is designed to overcome the length restriction of a traditional laboratory flume. The principal features of the moving-bed flume are: 1) the bed of the f1ume moves at a pre-designated speed. This is accomplished with a conveyor-type belt at the bottom of the f1ume's experimental portion, and 2) there is no flow into or out of the flume. Thus the cross-sectional mean flow velocity is zero. A moving-bed flume has been designed, built, and tested. Measurements of water surface gas transfer, which are nor-mally restricted by flume length, have been made and related to bottom shear and water temperature. The moving-bed f1ume is also useful for visualization of coherent structures in the flow, such as secondary currents. Hydrogen bubbles illuminated by a plane of laser lfght are used to visualize and measure these coherent structures. Flow visualization at the zero velocity point provides aunique view of secondary currents without the interference of the primary flowvelocity.
Year: 1985