Field Measurements of Secondary Currents in Straight Rivers
Publication: Journal of Hydraulic Engineering
Volume 119, Issue 5
Abstract
Basic knowledge of turbulent structures in open‐channel flows are now available from accurate experimental data that were obtained using a laser Doppler anemometer in laboratory flumes. Many of these experiments have, however, been conducted at moderate Reynolds numbers. Therefore, it is not yet clear whether such laboratory data of open‐channel turbulence can be applied to river turbulence at high Reynolds numbers. In this study, velocity measurements of the Biwako‐Sosui River in Kyoto and the Aichi Irrigation Channel in Nagoya have been conducted by making use of three‐component electromagnetic flow meters. Multicellular secondary currents were evident in a wide river, whereas large‐scale free‐surface secondary currents associated with velocity‐dip phenomena were generated in a narrow river. The features of such secondary currents in rivers could be explained by theory of turbulence, and also they coincided well with the laboratory experiments and numerical calculations.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 119 • Issue 5 • May 1993
Pages: 598 - 614
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Jul 15, 1992
Published online: May 1, 1993
Published in print: May 1993
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