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Experimental Study on the Angle of Repose of Submerged Cohesive Sediments
| 题名： | Experimental Study on the Angle of Repose of Submerged Cohesive Sediments |
| 正文语种： | 英文 |
| 作者： | Minxi Zhang1; Guoliang Yu2; Wenlong Zhu3; Ming Li4 |
| 作者单位： | 1Assistant Researcher, SKLOE, CISSE, School of Naval Architecture Ocean & Civil Engineering, Shanghai Jiao Tong Univ., Shanghai 200240, China. 2Professor, SKLOE, CISSE, School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong Univ., Shanghai 200240, China (corresponding author). 3Ph.D. Candidate, SKLOE, CISSE, School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong Univ., Shanghai 200240, China. Master’s Student, SKLOE, CISSE, School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong Univ., Shanghai 200240, China. |
| 关键词： | Submerged cohesive sediments; Rheology; Yield stress; Angle of repose (AoR); Flowability |
| 摘要： | The angle of repose (AoR) of sediments is an important parameter in the hydraulics of sediment transport. This study investigated the AoR (f ) 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(f ) 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. |
| 出版年： | 2019 |
| 期刊名称： | Journal of Waterway, Port, Coastal, and Ocean Engineering |
| 卷： | 145 |
| 期： | 3 |
| 页码： | 1-11 |
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