| 基于ADV声学泥沙反演与扩散机制分析 |
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| 引用本文： | 邓伟铸,吴加学,刘欢,任杰,杨名名,张云博.基于ADV声学泥沙反演与扩散机制分析[J].海洋学报,2014,36(7):57-69. |
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| 作者姓名： | 邓伟铸 吴加学 刘欢 任杰 杨名名 张云博 |
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| 作者单位： | 中山大学 海洋学院 近岸海洋科学与技术研究中心, 广东 广州 510275;珠江水资源保护科学研究所, 广东 广州 510611;中山大学 海洋学院 近岸海洋科学与技术研究中心, 广东 广州 510275;中山大学 海洋学院 近岸海洋科学与技术研究中心, 广东 广州 510275;中山大学 海洋学院 近岸海洋科学与技术研究中心, 广东 广州 510275;中山大学 海洋学院 近岸海洋科学与技术研究中心, 广东 广州 510275;中山大学 海洋学院 近岸海洋科学与技术研究中心, 广东 广州 510275 |
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| 基金项目： | 国家重大科学研究计划（2013CB956502）；自然科学基金项目（40976053，41176067，41276079）。 |
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| 摘 要： | 利用座底三脚架观测系统于2012年洪季对珠江黄茅海河口湾底边界层沉积动力过程进行了系统观测,建立了基于现场ADV探测的高频泥沙声学反演方法,分析了泥沙浓度、泥沙扩散通量及泥沙扩散系数随潮汐变化的特征,探讨了泥沙再悬浮的湍流猝发机制。泥沙浓度、泥沙扩散通量、涡动扩散系数及泥沙扩散系数具有明显的潮汐变化特征,主要表现为急流时较大、憩流时较小。泥沙沉降速度与泥沙浓度之间的幂函数关系可以很好地描述潮周期内沉降速度的变化。湍流猝发过程中,喷射和扫射事件是泥沙垂向扩散的主要动量来源,大振幅的猝发事件对泥沙垂向扩散具有决定性影响。
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| 关 键 词： | 底边界层 泥沙输移 声学泥沙 珠江河口 |
| 收稿时间： | 2013/8/31 0:00:00 |
| 修稿时间： | 2013/11/11 0:00:00 |
ADV-based acoustical sediment inversion and diffusion mechanism in the Pearl River Estuary |
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| Deng Weizhu,Wu Jiaxue,Liu Huan,Ren Jie,Yang Mingming and Zhang Yunbo.ADV-based acoustical sediment inversion and diffusion mechanism in the Pearl River Estuary[J].Acta Oceanologica Sinica (in Chinese),2014,36(7):57-69. |
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| Authors: | Deng Weizhu Wu Jiaxue Liu Huan Ren Jie Yang Mingming and Zhang Yunbo |
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| Institution: | Center for Coastal Ocean Science and Technology, School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China;Institute of Pearl River Water Resources Protection, Guangzhou 510611, China;Center for Coastal Ocean Science and Technology, School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China;Center for Coastal Ocean Science and Technology, School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China;Center for Coastal Ocean Science and Technology, School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China;Center for Coastal Ocean Science and Technology, School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China;Center for Coastal Ocean Science and Technology, School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China |
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| Abstract: | Instrumented tripod observations of bottom boundary layer flows and sediment transport were conducted in the 2012 flood season in the Pearl River Estuary,South China. An inversion of high-frequency sediment concentration was performed based on the signal-to-noise ratio of the acoustical Doppler velocimeter with a sampling frequency of 64 Hz. Sediment concentration,upward flux of sediment diffusion,eddy viscosity and sediment diffusivity are highly tide-affected,with large values occurring during peak tides,and small ones during slack tides. Settling velocity of sediment particles is dependent on the power of sediment concentration,rather than linearly on sediment concentration. The analyses of turbulence bursting events demonstrated that ejection and sweep are the major momentum source of sediment diffusion. The sediment diffusion is predominately controlled by the amplitude of bursting events,irrespectively of the occurrence number and duration of turbulence events. The large-amplitude bursting events were found to be responsible for upward sediment diffusion. |
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| Keywords: | bottom boundary layer sediment transport acoustical sediment Pearl River Estuary |
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