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挟沙水流速度与含沙量垂向分布关系探讨
引用本文:董啸天,李瑞杰,付刚才,张海春.挟沙水流速度与含沙量垂向分布关系探讨[J].河海大学学报(自然科学版),2015,43(4):371-376.
作者姓名:董啸天  李瑞杰  付刚才  张海春
作者单位:1. 河海大学海岸灾害及防护教育部重点实验室,江苏 南京 210098; 河海大学环境海洋实验室,江苏 南京 210098
2. 河海大学海岸灾害及防护教育部重点实验室,江苏 南京 210098; 珠海市海骏工程建筑处92311部队,广东 珠海 519080
3. 浙江省海洋开发研究院海洋环境与化工研究室,浙江 舟山,316100
基金项目:国家自然科学基金(41276017);国家海洋局海洋公益性行业科研专项
摘    要:采用数据拟合构造的挟沙水流掺混长度,结合Prandtl掺混长度理论,得到新的挟沙水流流速分布。类比动量传递系数表达式与掺混长度的关系,结合挟沙水流流速分布公式,得到新的含沙量垂线分布公式。分别利用水槽及河道实测资料验证,结果表明流速公式与含沙量公式可以客观准确地描述流速、含沙量垂向变化规律,对含沙量有更高的精度。误差分析表明:近底层流速误差较大,说明底部边界层的选取与判别仍需深入探究;近表层含沙量误差较大,说明含沙量参考点的选取在理论上仍需研究,以摆脱其随机影响。

关 键 词:近岸海域泥沙运动  挟沙水流掺混长度  流速分布  含沙量垂向分布
收稿时间:2014/9/9 0:00:00

Relationship between vertical distributions of velocity and sediment concentration of sediment-laden flow
DONG Xiaotian,LI Ruijie,FU Gangcai and ZHANG Haichun.Relationship between vertical distributions of velocity and sediment concentration of sediment-laden flow[J].Journal of Hohai University (Natural Sciences ),2015,43(4):371-376.
Authors:DONG Xiaotian  LI Ruijie  FU Gangcai and ZHANG Haichun
Institution:Key Laboratory of Coastal Disaster and Defence, Ministry of Education, Hohai University, Nanjing 210098, China; Laboratory of Ocean Environment, Hohai University, Nanjing 210098, China,Key Laboratory of Coastal Disaster and Defence, Ministry of Education, Hohai University, Nanjing 210098, China; Laboratory of Ocean Environment, Hohai University, Nanjing 210098, China,Key Laboratory of Coastal Disaster and Defence, Ministry of Education, Hohai University, Nanjing 210098, China; Haijun Construction Company of Zhuhai, Unit 92311, Zhuhai 519080, China and Marine Environment and Chemical Laboratory, Zhejiang Marine Development Research Institute, Zhoushan 316100, China
Abstract:Using the mixing length of sediment-laden flow constructed with data fitting and combining the Prandtl mixing length theory, a new equation describing the velocity distribution of sediment-laden flow was established. Based on this new equation and the analogy of the relationship between the momentum transfer coefficient and mixing length, a new equation describing the vertical distribution of sediment concentration was also established. Through verification with observed data from the flume experiment and field survey, it was found that these two equations can objectively describe the vertical variations of velocity and sediment concentration, showing a higher precision in describing the sediment concentration. The error analysis shows that the error of the near-bottom velocity is large, indicating that the selection and judgment of the bottom boundary layer need further investigation; the error of the sediment concentration close to the surface is large, indicating that the selection of the reference point for the sediment concentration requires further theoretical research, in order to discard the influence of random effects.
Keywords:nearshore sediment movement  mixing length of sediment-laden flow  velocity distribution  vertical distribution of sediment concentration
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