On the role of wind and tide in generating variability of Pearl River plume during summer in a coupled wide estuary and shelf system

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	On the role of wind and tide in generating variability of Pearl River plume during summer in a coupled wide estuary and shelf system
	Zu, TT ; Wang, DX ; Gan, JP ; Guan, WB
刊名	JOURNAL OF MARINE SYSTEMS
	2014
卷号	136 页码:65-79
关键词	Mathematical models River plumes Energy budget Vertical mixing Pearl River Estuary
ISSN号	0924-7963
通讯作者	dxwang@scsio.ac.cn
中文摘要	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.
学科主题	Geology ; Marine & Freshwater Biology ; Oceanography
收录类别	SCI
资助信息	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]
原文出处	ELSEVIER SCIENCE BV
WOS记录号	WOS:000337865500007
公开日期	2014-12-11
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/10524]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
推荐引用方式 GB/T 7714	Zu, TT,Wang, DX,Gan, JP,et al. On the role of wind and tide in generating variability of Pearl River plume during summer in a coupled wide estuary and shelf system[J]. JOURNAL OF MARINE SYSTEMS,2014,136:65-79.
APA	Zu, TT,Wang, DX,Gan, JP,&Guan, WB.(2014).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,136,65-79.
MLA	Zu, TT,et al."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 136(2014):65-79.