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Sediment dynamics in adjacent bays of Fujian during late-spring spring tide

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Titel: Sediment dynamics in adjacent bays of Fujian during late-spring spring tide
Autoren: Meng Liu, Mengying Hu, Jun Ma, Bo Liu, Jian Gu, Bin Yu, Chuanqi Hu, Ruijia Jin, Yingtao Zhu
Quelle: Frontiers in Marine Science, Vol 12 (2025)
Verlagsinformationen: Frontiers Media S.A., 2025.
Publikationsjahr: 2025
Bestand: LCC:Science
LCC:General. Including nature conservation, geographical distribution
Schlagwörter: sediment dynamics, residual current, bay, in-situ observation, coastal processes, Science, General. Including nature conservation, geographical distribution, QH1-199.5
Beschreibung: Bays are active land–sea transition zones where the internal hydrodynamic processes control the material exchange between the bay and open sea. Yet, the differences and potential connectivity of those processes between adjacent bays and off-bay areas remains understudied. Using in situ observations during a spring tide in May 2020, complemented with satellite imagery and reanalysis dataset, this study examines sediment dynamics in two neighboring bays of central Fujian—Shenhu Bay (SHB) and Weitou Bay (WTB). Results show that SHB exhibits tidal asymmetry with strong offshore export, while WTB has weaker, vertically divergent residual currents with bottom-layer seaward suspended sediment flux. Outside the bays, residual currents and sediment flux follow a northeastward coastal pathway under late-spring circulation. Sediment transport from bay interiors to mouths and is further transported downstream by regional circulation, potentially entering adjacent bay through exchange between the bay and the open sea. Mechanism analysis indicates that Eulerian residual currents dominate net sediment transport, whereas tidal pumping is minor. These findings reveal sediment export pathways and inter-bay connectivity, advancing understanding of coastal sediment dynamics and material cycling in Fujian waters.
Publikationsart: article
Dateibeschreibung: electronic resource
Sprache: English
ISSN: 2296-7745
Relation: https://www.frontiersin.org/articles/10.3389/fmars.2025.1716912/full; https://doaj.org/toc/2296-7745
DOI: 10.3389/fmars.2025.1716912
Zugangs-URL: https://doaj.org/article/93001f937a0d416bb31d2a676bfe1cf8
Dokumentencode: edsdoj.93001f937a0d416bb31d2a676bfe1cf8
Datenbank: Directory of Open Access Journals
Beschreibung
Abstract:Bays are active land–sea transition zones where the internal hydrodynamic processes control the material exchange between the bay and open sea. Yet, the differences and potential connectivity of those processes between adjacent bays and off-bay areas remains understudied. Using in situ observations during a spring tide in May 2020, complemented with satellite imagery and reanalysis dataset, this study examines sediment dynamics in two neighboring bays of central Fujian—Shenhu Bay (SHB) and Weitou Bay (WTB). Results show that SHB exhibits tidal asymmetry with strong offshore export, while WTB has weaker, vertically divergent residual currents with bottom-layer seaward suspended sediment flux. Outside the bays, residual currents and sediment flux follow a northeastward coastal pathway under late-spring circulation. Sediment transport from bay interiors to mouths and is further transported downstream by regional circulation, potentially entering adjacent bay through exchange between the bay and the open sea. Mechanism analysis indicates that Eulerian residual currents dominate net sediment transport, whereas tidal pumping is minor. These findings reveal sediment export pathways and inter-bay connectivity, advancing understanding of coastal sediment dynamics and material cycling in Fujian waters.
ISSN:22967745
DOI:10.3389/fmars.2025.1716912