Experimental Study on the Angle of Repose of Submerged Cohesive Sediments
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 145, Issue 3
Abstract
The angle of repose (AoR) of sediments is an important parameter in the hydraulics of sediment transport. This study investigated the AoR (ϕ) of submerged cohesive sediments using a tilting plane. The results indicate that the yield stress and particle size are factors that have major influences on the AoR. For specific sediments, sin(ϕ) increases linearly with increasing yield stress. For a certain yield stress, the AoR increases with increasing median grain size. Meanwhile, the effect of the yield stress on the AoR is significant for the cohesive sediments and becomes progressively weaker with the increasing median grain size. A simple and reliable empirical formula that includes a rheological term and a gravity term is proposed to calculate the AoR of submerged cohesive sediments. Furthermore, a series of vibration tests was designed and performed with the sediment samples to explore the effect of mechanical vibration on the AoR. The results show that the mechanical vibration can significantly fluidize the submerged cohesive sediments, which can lead to a significant decrease in the AoR.
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Acknowledgments
This work was supported by the United Fund of Ministry of Education of P.R. China (Grant 6141A02022337).
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Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 145 • Issue 3 • May 2019
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© 2019 American Society of Civil Engineers.
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Received: Mar 1, 2018
Accepted: Oct 18, 2018
Published online: Feb 12, 2019
Published in print: May 1, 2019
Discussion open until: Jul 12, 2019
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