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Spatiotemporal variability of water exchanges in the Pearl River Estuary by interactive multiscale currents
Cai, Zhongya1,2; Liu, Guangliang3; Liu, Zhiqiang4,5; Gan, Jianping2
2022-02-05
Source PublicationEstuarine, Coastal and Shelf Science
ISSN0272-7714
Volume265
Abstract

Driven by interactive multiscale motions, the water exchange between the Pearl River Estuary (PRE) and coastal seas exhibits complex spatial structures and significant temporal variability. In this study, the exposure time (θ‾) was calculated using the adjoint method to examine the spatiotemporal characteristics of water exchange and illustrate the substance movement pathway in the PRE and the adjacent shelf. Seasonal variations in water exchange are generally determined by subtidal motion in the estuary and adjacent shelf. In summer, the θ‾ gradually increases from approximately 5 days near the lower estuary to 15 days in the upper estuary. In winter, associated with the weaker river discharge and prevailing northeasterly winds, the water exchange is suppressed and θ‾ increases to approximately 35 days in the upper estuary. Owing to the surface/bottom subtidal offshore/onshore transport in the water column, the θ‾ of the bottom water increases by 10 days compared to the surface water. Outside the estuary, the seasonally reversing shelf current and onshore transport move the shelf substance back into the PRE. The θ‾ to the southwest and northeast of the PRE is approximately 5 and 10 days in summer and winter, respectively. Temporally, the interplay between the periodic tidal motion and shelf current induces a significant intra-tidal variation of θ‾, predominantly in the middle estuary, where the water exchange is sensitive to the initial release time. The θ‾ with the initial release time of high/low tide generally has shorter/longer values. The intra-tidal variation of θ‾ is approximately three days and two weeks in summer and winter, respectively. The distinct three-dimensional structure and intra-tidal variability of water exchange illustrated in this study help to better utilize fluid motion that refreshes the water inside the estuary.

KeywordAdjoint Method Interactive Multiscale Currents Intra-tidal Variability Pearl River Estuary Water Exchange
DOI10.1016/j.ecss.2021.107730
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaMarine & Freshwater Biology ; Oceanography
WOS SubjectMarine & Freshwater Biology ; Oceanography
WOS IDWOS:000789702900002
Scopus ID2-s2.0-85121849396
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Cited Times [WOS]:0   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionTHE STATE KEY LABORATORY OF INTERNET OF THINGS FOR SMART CITY (UNIVERSITY OF MACAU)
Corresponding AuthorCai, Zhongya; Liu, Zhiqiang
Affiliation1.State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering, University of Macau, Macau, China
2.Center for Ocean Research in Hong Kong and Macau, Department of Ocean Science and Mathematics, Hong Kong University of Science and Technology, Hong Kong
3.Shandong Provincial Key Laboratory of Computer Networks, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250101, China
4.Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, China
5.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China
First Author AffilicationUniversity of Macau
Corresponding Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Cai, Zhongya,Liu, Guangliang,Liu, Zhiqiang,et al. Spatiotemporal variability of water exchanges in the Pearl River Estuary by interactive multiscale currents[J]. Estuarine, Coastal and Shelf Science,2022,265.
APA Cai, Zhongya,Liu, Guangliang,Liu, Zhiqiang,&Gan, Jianping.(2022).Spatiotemporal variability of water exchanges in the Pearl River Estuary by interactive multiscale currents.Estuarine, Coastal and Shelf Science,265.
MLA Cai, Zhongya,et al."Spatiotemporal variability of water exchanges in the Pearl River Estuary by interactive multiscale currents".Estuarine, Coastal and Shelf Science 265(2022).
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