期刊
JOURNAL OF HYDRAULIC RESEARCH
卷 60, 期 1, 页码 125-135出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00221686.2020.1871430
关键词
Boundary condition; erosion processes; entrainment rate; pickup rate; sediment transport
资金
- Open Research Fund of State Key Laboratory of Estuarine and Coastal Research [SKLEC-KF202003]
- Open Research Fund of State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology [LP2020]
- Fundamental Research Funds for the Central Universities, Hohai University [B200202052]
- Open Research Fund of Key Laboratory of Ministry of Education for Coastal Diasater and Protection, Hohai University [201914, 201807]
- National Natural Science Foundation of China [51879096]
- key project of the National Natural Science Foundation of China [41930538]
- Major International (Regional) Joint Research Project of National Natural Science Foundation of China [51920105013]
- National Science Fund for Distinguished Young Scholars [51425901]
This study investigates the experimental results of the pickup rate of non-cohesive sediments in uniform flows, and attempts to revise existing formulas to predict the grain-by-grain pickup rate under high and low entrainment rate conditions.
Erosion of sediments is of crucial significance to morphologic evolution, management of water quality and aquatic ecosystems. However, the prediction of the pickup rate of non-cohesive sediments is a challenging topic because of the complex interaction between the bed and the flow. This study reports the experimental results of the pickup rate of non-cohesive sediments in uniform flows. Six groups of uniform sand with diameters in the range of 0.183 mm to 1.090 mm were tested. The pickup rate was measured near the erosion thresholds. The experimental data, along with the data collected from previous studies, are applied to evaluate existing formulae for the grain-by-grain pickup rate. Those commonly used formulae fail to reproduce measurements well at both the high and low entrainment rate conditions. Efforts are made to revise the formula of Cao (1997) to predict the grain-by-grain pickup rate at both the high and low entrainment rate conditions.
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