1. Numerical investigation of successive land reclamation effects on hydrodynamics and water quality in Bohai Bay.
- Author
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Zhang, Hong-Xing, Shen, Yong-Ming, and Tang, Jun
- Subjects
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RECLAMATION of land , *WATER quality , *HYDRODYNAMICS , *WATER distribution , *SALINITY , *TIDAL power , *WATER salinization - Abstract
The hydrodynamics and water quality evolutions in response to the land reclamations in Bohai Bay were investigated by developing a coupled hydrodynamics-water quality model. Simulated results indicate reclamations considerably change the residual current fields and decrease the tidal prisms. After 1990–2006 reclamations, salinity isolines in the west of the bay obviously move towards open sea, and cause the decrease of salinity value. Compared with the 2006 reclamation scenario, the 2022 reclamation scenario generates larger salinity concentration, thereby intensifying salinity intrusion. Besides, a large amount of dissolved inorganic nitrogen (DIN) is retained in the bay and increases its concentration value due to 1990–2006 reclamations, which almost presents opposite variation in the 2022 reclamation scenario. 1990–2006 reclamations increase phytoplankton carbon concentrations in the most bay areas, with a maximum increased value of 53.37 μg/L. With the further construction of reclamations (2006–2022), phytoplankton carbon concentrations increase within several estuarine areas, nevertheless the decreases appear in the large areas from estuarine mouths to bay's center. Statistically, the averaged salinity concentration slightly changes in the whole bay, while the averaged DIN and phytoplankton carbon concentrations significantly increase by 14.92% and 13.33% during 1990–2006, then they decrease by 16.02% and 20.68% during 2006–2022, respectively. [Display omitted] • A coupled hydrodynamics-water quality model is established in Bobai Bay. • Land reclamations change residual current fields and decreases tidal prisms. • Land reclamations affect spatial distributions of water quality parameters. • Averaged dissolved inorganic nitrogen and phytoplankton carbon increase by 14.92% and 13.33% after 1990–2006 reclamations. • Nevertheless they decrease by 16.02% and 20.68% due to 2006–2022 reclamations. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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