Cohesive Sediment Characterization by Combined Sedimentation and Rheological Measurements
Publication: Journal of Hydraulic Engineering
Volume 134, Issue 9
Abstract
A laboratory characterization of cohesive sediment has been carried out in which data obtained from standard sedimentation and rheological measurements were combined in a determination of the critical solid concentration for the detection of elasticity in a weakly cohesive suspension. The corresponding storage modulus and shear stress are very critical in any in situ rheometry of sediments, especially in the study of mud-water surface erosion in a flume. Sedimentation results showed that particle size distribution rather than surface treatment controlled the rheological behavior of the suspension while the critical solid concentration for the appearance of three-dimensional space-filling network, showing some measurable elasticity in the suspension, occurred in the region of 0.015. This parallel between the consolidation behavior and shear rheology development for the flocculating system has been established. This technique could be an adjunct to the laboratory characterization of cohesive sediments for the estimation of critical shear stress for surface erosion, especially in a typical flume experiment under water wave pressure.
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Acknowledgments
The writers wish to acknowledge the Science and Engineering Research Council (SERC) of the United Kingdom and University of Wales, Swansea, United Kingdom for the support given during the course of this research project at the Department of Chemical Engineering, University of Wales, Swansea, United Kingdom. The first writer would like to thank Obafemi Awolowo University, Ile-Ife, Nigeria for granting a study leave.
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Published In
Journal of Hydraulic Engineering
Volume 134 • Issue 9 • September 2008
Pages: 1333 - 1336
Copyright
© 2008 ASCE.
History
Received: May 4, 2004
Accepted: Sep 25, 2007
Published online: Sep 1, 2008
Published in print: Sep 2008
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