Channel‐Trapped Convergence and Divergence of Lateral Velocity in the Pearl River Estuary: Influence of Along‐Estuary Variations of Channel Depth and Width.
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| Title: | Channel‐Trapped Convergence and Divergence of Lateral Velocity in the Pearl River Estuary: Influence of Along‐Estuary Variations of Channel Depth and Width. |
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| Authors: | Pan, Jiayi1,2, Lai, Wenfeng2 laiwf@link.cuhk.edu.hk, Devlin, Adam T.1,2 |
| Source: | Journal of Geophysical Research. Oceans. Jan2020, Vol. 125 Issue 1, pN.PAG-N.PAG. 1p. |
| Subject Terms: | *Tides, *Salinity, Geophysical surveys, Bathymetric maps, Convergence (Meteorology) |
| Geographic Terms: | Pearl River Estuary (China) |
| Abstract: | A cruise survey was conducted in the Pearl River Estuary (PRE) in May 2014. In situ observations during this cruise reveal that at the surface in the central channel of the PRE there was a strong convergence of lateral velocity during an ebb tide and a divergence during a flood tide. The ebb tide convergence was also observed in satellite synthetic aperture radar imagery. The Finite‐Volume Coastal Ocean Model was executed in the PRE domain to accurately simulate the convergence and divergence of the cross‐estuary velocity during ebb and flood tides, respectively. Numerical experiments in an idealized estuary domain are implemented with three distinct forcing scenarios: tide, river discharge, and a combination of both. Model results show that the cross‐estuary momentum balance plays a significant role in the dynamics of the velocity convergence and divergence in the PRE. Additionally, the interaction between tide and river discharge enhances the surface convergence on ebb tide and generates the surface divergence on flood tide. The model results reveal that the along‐estuary variation of channel depth and width is responsible for the tide‐induced lateral velocity convergence and divergence in the channel, supported by the fact that when the channel depth and width are set to constant values in the model, the channel‐trapped ebb convergence substantially weakens, and the flood divergence disappears. This study provides an indication for other wide estuaries. Key Points: Lateral velocity convergence and divergence were observed in the central channel of the Pearl River Estuary.Lateral pressure gradient is a major dynamical forcing for the lateral velocity convergence and divergence.Along‐channel variation in channel depth and width is a main mechanism for the tide forcing on the velocity convergence and divergence. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Geophysical Research. Oceans is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | GreenFILE |
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| Header | DbId: 8gh DbLabel: GreenFILE An: 141526812 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Channel‐Trapped Convergence and Divergence of Lateral Velocity in the Pearl River Estuary: Influence of Along‐Estuary Variations of Channel Depth and Width. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Pan%2C+Jiayi%22">Pan, Jiayi</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Lai%2C+Wenfeng%22">Lai, Wenfeng</searchLink><relatesTo>2</relatesTo><i> laiwf@link.cuhk.edu.hk</i><br /><searchLink fieldCode="AR" term="%22Devlin%2C+Adam+T%2E%22">Devlin, Adam T.</searchLink><relatesTo>1,2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Oceans%22">Journal of Geophysical Research. Oceans</searchLink>. Jan2020, Vol. 125 Issue 1, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Tides%22">Tides</searchLink><br />*<searchLink fieldCode="DE" term="%22Salinity%22">Salinity</searchLink><br /><searchLink fieldCode="DE" term="%22Geophysical+surveys%22">Geophysical surveys</searchLink><br /><searchLink fieldCode="DE" term="%22Bathymetric+maps%22">Bathymetric maps</searchLink><br /><searchLink fieldCode="DE" term="%22Convergence+%28Meteorology%29%22">Convergence (Meteorology)</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Pearl+River+Estuary+%28China%29%22">Pearl River Estuary (China)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: A cruise survey was conducted in the Pearl River Estuary (PRE) in May 2014. In situ observations during this cruise reveal that at the surface in the central channel of the PRE there was a strong convergence of lateral velocity during an ebb tide and a divergence during a flood tide. The ebb tide convergence was also observed in satellite synthetic aperture radar imagery. The Finite‐Volume Coastal Ocean Model was executed in the PRE domain to accurately simulate the convergence and divergence of the cross‐estuary velocity during ebb and flood tides, respectively. Numerical experiments in an idealized estuary domain are implemented with three distinct forcing scenarios: tide, river discharge, and a combination of both. Model results show that the cross‐estuary momentum balance plays a significant role in the dynamics of the velocity convergence and divergence in the PRE. Additionally, the interaction between tide and river discharge enhances the surface convergence on ebb tide and generates the surface divergence on flood tide. The model results reveal that the along‐estuary variation of channel depth and width is responsible for the tide‐induced lateral velocity convergence and divergence in the channel, supported by the fact that when the channel depth and width are set to constant values in the model, the channel‐trapped ebb convergence substantially weakens, and the flood divergence disappears. This study provides an indication for other wide estuaries. Key Points: Lateral velocity convergence and divergence were observed in the central channel of the Pearl River Estuary.Lateral pressure gradient is a major dynamical forcing for the lateral velocity convergence and divergence.Along‐channel variation in channel depth and width is a main mechanism for the tide forcing on the velocity convergence and divergence. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Geophysical Research. Oceans is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1029/2019JC015369 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Tides Type: general – SubjectFull: Salinity Type: general – SubjectFull: Geophysical surveys Type: general – SubjectFull: Bathymetric maps Type: general – SubjectFull: Convergence (Meteorology) Type: general – SubjectFull: Pearl River Estuary (China) Type: general Titles: – TitleFull: Channel‐Trapped Convergence and Divergence of Lateral Velocity in the Pearl River Estuary: Influence of Along‐Estuary Variations of Channel Depth and Width. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Pan, Jiayi – PersonEntity: Name: NameFull: Lai, Wenfeng – PersonEntity: Name: NameFull: Devlin, Adam T. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: Jan2020 Type: published Y: 2020 Identifiers: – Type: issn-print Value: 21699275 Numbering: – Type: volume Value: 125 – Type: issue Value: 1 Titles: – TitleFull: Journal of Geophysical Research. Oceans Type: main |
| ResultId | 1 |
