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学科主题: Geology ; Marine & Freshwater Biology ; Oceanography
题名: On the role of wind and tide in generating variability of Pearl River plume during summer in a coupled wide estuary and shelf system
作者: Zu, TT ; Wang, DX ; Gan, JP ; Guan, WB
通讯作者: dxwang@scsio.ac.cn
关键词: Mathematical models ; River plumes ; Energy budget ; Vertical mixing ; Pearl River Estuary
刊名: JOURNAL OF MARINE SYSTEMS
发表日期: 2014
卷: 136, 页:65-79
收录类别: sci
部门归属: [Zu, Tingting ; Wang, Dongxiao] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China ; [Gan, Jianping] Hong Kong Univ Sci & Technol, Div Environm, Kowloon, Hong Kong, Peoples R China ; [Gan, Jianping] Hong Kong Univ Sci & Technol, Dept Math, Kowloon, Hong Kong, Peoples R China ; [Guan, Weibing] State Ocean Adm, Inst Oceanog 2, State Key Lab Satellite Ocean Environm Dynam, Hangzhou 310012, Zhejiang, Peoples R China
项目归属: LTO
资助者: National Natural Science Foundation of China [41006012, 91128204]; 973 program [2011CB403504]; Hong Kong's Research Grant Council [GRF612412]; youth talent frontier field project of SCSIO; CAS [SQ201002]; Guangzhou Municipal Science and Technology Project [12F084060027]
摘要: A numerical simulation of the buoyant river plume over the Pearl River Estuary (PRE) and adjacent shelf during a typical upwelling favorable wind period of the summer monsoon is utilized to explore the responses of the plume to wind and tide forcing. The model is forced with time-dependent river discharge, wind and tide, and it shows reasonable ability to capture the basic structure and responses of the plume. Additional numerical experiments that are forced without either wind or tide are used to evaluate the relative importance of wind and tide in generating plume variability. Results show that the vertical structure of the plume and the strength of the stratification in the estuary are determined by the combination of the buoyancy forcing associated with river discharge and tidal forcing, and vary with the advection process, while the horizontal shape and spreading of the plume over the shelf are highly influenced by the wind-driven coastal current, and are more susceptible to the change of vertical mixing. Mechanical energy analysis in each dynamical region (upper, middle, lower estuary, and shelf) reveals that this is because the system mainly gains energy from tide (wind) in the estuary (shelf), and loses energy to the bottom friction (internal-shear mixing) in the estuary (shelf). The largest forcing and dissipation terms in the middle PRE, and at the entrances of smaller estuaries such as Huang Mao Hai, are due to tidal forcing, which enables the middle PRE to serve dynamically as the entrance of an estuary, where the transition of the river plume into coastal buoyancy current usually takes place. In addition, the mixing efficiency increases from upper PRE to the shelf and from strong to weak mixing period, thus the plume in the well-mixed upper estuary is not as sensitive to the changes of wind and tide as that over the highly stratified shelf. (C) 2014 Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000337865500007
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10524
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Zu, TT; Wang, DX; Gan, JP; Guan, WB.On the role of wind and tide in generating variability of Pearl River plume during summer in a coupled wide estuary and shelf system,JOURNAL OF MARINE SYSTEMS,2014,136():65-79
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