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General Session 1: Physical oceanic processes: Dynamics and physical-biological-biogeochemical interactions |
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Hydrodynamics and sediment transport in response to sequential reclamations over Tianjin port subtidal waters
GS1-05-S
Danxi Chen* , Ministry of Education Key Laboratory for Coast and Island Development,Nanjing University,Nanjing,210023,China.
Yaping Wang, Ministry of Education Key Laboratory for Coast and Island Development,Nanjing University,Nanjing,210023,China.
Presenter Email: cdxdaisy@gmail.com
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| This paper focuses on the hydrodynamic changes and sediment transport processes inTianjin Port subtidal waters in Bo Sea Bay with influences of sequential reclamations. The sediment transport processes were analyzed by the method of flux decomposition. The result showed that the tidal pumping effect (especially the tidal trapping) and the Lagrangian advection transport were the main contributions in terms of suspended sediment transport, where the latter event was lower than the former. However, the proportion of tidal trapping effect had been decreased and the Lagrangian advection transport had increased with years’ reclamations. The suspended sediment concentration showed a significant linear relationship with the depth-averaged velocity at the bottom layer during the flood but not during the ebb, which indicated strong resuspension. The suspended sediment transported asymmetrically, with a higher sediment transportation during flood tide, which led to the net sediment transportation onshore during a tidal cycle. For current velocity between flood and ebb tides, the asymmetry was not only confined to the value and duration, but also to its vertical velocity structure. In conclusion, the strong asymmetry of both suspended sediment concentration and the current velocity during ebb and flood tides were the main contributions to a strong tidal trapping. |
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