Sediment Exchange between a River and Its Groyne Fields: Mobile-Bed Experiment
Publication: Journal of Hydraulic Engineering
Volume 136, Issue 9
Abstract
Experiments have been carried out in a mobile-bed laboratory flume in order to study the sediment exchange process between the main channel and the groyne fields. The flume represented half the width of a schematized river reach with a series of groynes. The experiment was designed to represent typical dimensions of the Dutch River Waal at a geometrical scale of 1:100. The conditions were set to guarantee bed load as well as suspended load sediment transport. Conditions with submerged and emerged groynes were investigated. In addition to traditional measurements, viz., bed-level changes, suspended sediment concentrations, and flow velocities, bed-form propagation was measured in two dimensions using a the particle image velocimetry technique. The results were analyzed with focus on sediment exchange mechanisms and sediment transport patterns. The results demonstrate that under all flow conditions there is a net import of sediment into the groyne fields. The prevailing transport mechanisms vary with the flow stage: if the groynes are emerged it is mainly advection by the primary circulation cell, whereas if the groynes are submerged it is rather residual advection by large-scale coherent flow structures (in a straight reach). Additional entrainment of sediment by enhanced turbulence complicates the erosion/deposition patterns.
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Acknowledgments
This experiment was carried out within the framework of DIOC Water, Theme 1.3 (intermediate-scale morphological developments in rivers due to human interventions) and Delft Cluster, Theme 3 (Coasts and Rivers). The writers would like to thank the staff members of the Laboratory for Fluid Mechanics of the Delft University of Technology for facilitating the experiment in all its stages, and thank Mr. Kenneth Thiemann, Mr. Dirk Smolenaars, and Mr. Sjoerd Dijkstra for conducting the experiments. The writers also thank Mr. G. J. Klaassen and Mr. M. van der Wal, and Dr. E. Mosselman, Dr. C. J. Sloff, and Dr. W. S. J. Uijttewaal for their constructive comments and discussions during the different stages of the experiment.
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Information
Published In
Journal of Hydraulic Engineering
Volume 136 • Issue 9 • September 2010
Pages: 610 - 625
Copyright
© 2010 ASCE.
History
Received: Jan 8, 2007
Published online: Mar 17, 2010
Accepted: May 27, 2010
Published in print: Sep 2010
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