Impact of tides and winds on estuarine circulation in the Pearl River Estuary

被引:41
作者
Lai, Wenfeng [1 ]
Pan, Jiayi [1 ,2 ,3 ]
Devlin, Adam T. [1 ]
机构
[1] Chinese Univ Hong Kong, Inst Space & Earth Informat Sci, Shatin, Hong Kong, Peoples R China
[2] Nanjing Univ Informat Sci & Technol, Coll Marine Sci, Nanjing 210044, Jiangsu, Peoples R China
[3] Chinese Univ Hong Kong, Shenzhen Res Inst, Shenzhen 518057, Guangdong, Peoples R China
基金
中国国家自然科学基金;
关键词
Pearl River Estuary; Estuarine circulation; Axial wind forcing; Spring and neap tide; Tide and wind interaction; FVCOM; PARTIALLY-MIXED ESTUARY; SHALLOW ESTUARIES; CHESAPEAKE BAY; INDUCED DESTRATIFICATION; RESIDUAL CIRCULATION; NARROW ESTUARIES; TIDAL FLOWS; OCEAN MODEL; STRATIFICATION; DYNAMICS;
D O I
10.1016/j.csr.2018.09.004
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
The Finite-Volume Coastal Ocean Model (FVCOM) is used to simulate the dynamics of the circulation in the Pearl River Estuary (PRE), validated against the in-situ measurements of a cruise survey. The model simulation agrees well with observed sea level at local tide gauge stations and reproduces observed characteristics of the currents. A simplified model run without wind forcing reveals that there is a significant spring-neap variation in the along-estuary circulation. Additional sensitivity runs that. include up-estuary and/or down-estuary winds are also implemented. These results reveal that the cross-estuary adjustment of stratification and mixing induced by along-estuary winds is stronger than the along-estuary wind straining effect; these yields enhanced stratification and weakened mixing under the up-estuary wind. During spring tide, the response of the along-estuary circulation to the along-estuary wind forcing is weak, while during neap tide, the up-estuary and down-estuary winds may induce substantial variations in the along-estuary circulation. The analysis on the momentum budget and turbulent stress reveals the different dynamic response of the estuarine circulation in the PRE to different wind forcing conditions, identifying a significant modification to estuarine circulation by the wind-tide interaction.
引用
收藏
页码:68 / 82
页数:15
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