| 长江河口区边界层参数的观测与分析 |
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| 引用本文： | 汪亚平,高建华,潘少明.长江河口区边界层参数的观测与分析[J].海洋地质动态,2006,22(7):16-20. |
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| 作者姓名： | 汪亚平 高建华 潘少明 |
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| 作者单位： | 南京大学海岸与海岛开发教育部重点实验室,南京,210093 |
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| 基金项目： | 中国科学院资助项目;国家研究发展基金 |
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| 摘 要： | 2003年11月在长江口南槽用ADCP进行定点水文观测,结果表明研究区为不规则半日潮,在水流转向期流速较低时常出现悬沙浓度峰值。根据流速对数剖面分布模型与悬沙分布模型,分别计算了海底边界层参数,其中潮周期内摩阻流速可达0.15 m/s,粗糙长度为0.01~1.2 m,拖曳系数为10-3~10-4,边界层厚度为2~4 m,悬沙的沉降速率为0.2~6 mm/s。
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| 关 键 词： | 海底边界层 流速 悬沙浓度 沉降速度 长江口 |
| 文章编号： | 1009-2722（2006）07-0016-05 |
| 收稿时间： | 2006-05-18 |
| 修稿时间： | 2006年5月18日 |
MEASUREMENT OF BOTTOM BOUNDARY LAYER PARAMETERS OF THE YANGTZE RIVER ESTUARY |
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| WANG Ya-ping,GAO Jian-hua,PAN Shao-ming.MEASUREMENT OF BOTTOM BOUNDARY LAYER PARAMETERS OF THE YANGTZE RIVER ESTUARY[J].Marine Geology Development,2006,22(7):16-20. |
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| Authors: | WANG Ya-ping GAO Jian-hua PAN Shao-ming |
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| Abstract: | Hydrodynamic parameters have been measured using an RDI WH600 ADCP at Nancao,the Yangtze River estuary in November 2003.The acoustic signals recorded have a significant relationship with the suspended sediment concentrations(SSCs) obtained by in-situ water sampling during the measurements.Then the acoustic SSC models have been established to convert ADCP acoustic signals into high-resolution SSCs.The water levels and current velocities show that the study area is characteristic of irregular semi-diurnal tide.In addition,the peak SSC is present at the turn of tidal current,which may have resulted from the velocity shear.On the basis of von Karman-Prandl logarithmic velocity profile and Rose SSC profile,the bottom boundary layer parameters are estimated: the shear velocity can reach up to 0.15 m/s,and the bed roughness length is 0.01~1.2 m.The drag coefficient is 10~(-3)~10~(-4),and bottom boundary layer thickness is 2~4 m.The suspended sediment settling velocity is 0.2~6 mm/s,which is consistent with the results from previous study. |
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| Keywords: | bottom boundary layer current velocity suspended sediment concentration suspended sediment settling velocity the Yangtze River estuary |
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