Research Article
Feb 1977
Wave Entrainment of Sediment from Rippled Beds
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VIEW THE REPLYAuthors: Tatsuaki Nakato, AM.ASCE, Frederick A. Locher, AM.ASCE, John R. Glover, and John F. Kennedy, M.ASCEAuthor Affiliations
Publication: Journal of the Waterway, Port, Coastal and Ocean Division
Volume 103, Issue 1
Abstract
An experimental investigation was conducted with an oscillatory flow water tunnel to elucidate the mechanism of sediment entrainment by periodic fluid motion past rippled beds. The instrumentation used included an optical-type sediment concentration analyzer, a hot-wire anemometer, and an IBM 1801 Data Acquisition and Control System. The signal-averaging technique used to analyze the data permitted decomposition of the concentration and velocity signals into mean, periodic, and random components. The process of sediment entrainment and suspension is explained in terms of flow separation from the ripple crest together with the flow reversal. Simultaneous measurement of temporal and spatial distributions of suspended sediment concentration. Simultaneous measurement of temporal and spatial distributions of suspended sediment relationship and vertical fluid velocity in the region just above the bed showed that the conventional one-dimensional continuity relationship for steady uniform flow is inadequate; the horizontal gradient of streamwise sediment flux is comparable in importance to the vertical gradient of vertical flux of sediment.
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Published In
Journal of the Waterway, Port, Coastal and Ocean Division
Volume 103 • Issue 1 • February 1977
Pages: 83 - 99
Copyright
© 1977 American Society of Civil Engineers.
History
Published in print: Feb 1977
Published online: Feb 12, 2021
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Authors
Affiliations
Tatsuaki Nakato, AM.ASCE
Research Engr., Inst. of Hydr. Research, Univ. of Iowa, Iowa City, Iowa
Frederick A. Locher, AM.ASCE
Sr. Engr., Bechtel Corp., San Francisco, Calif.
John R. Glover
Research Engr., Inst. of Hydr. Research and Prof. in Div. of Energy Engrg., Univ. of Iowa, Iowa City, Iowa
John F. Kennedy, M.ASCE
Dir., Inst. of Hydr. Research and Chmn. of Div. of Energy Engrg., Univ. of Iowa, Iowa City, Iowa
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