Formation mechanism of freshwater zone around the Meimao Sandbank in the Changjiang estuary |
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Authors: | Chen Bingrui Zhu Jianrong Fu Lihui |
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Institution: | (1) State Key Lab of Estuarine & Coastal Research, East China Normal University, Shanghai, 200062, China;(2) Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, The Netherlands |
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Abstract: | This study focuses on dynamic mechanism behind the formation of the freshwater zone around the Meimao Sandbank by use of 3D
numerical simulation. The Meimao Sandbank is located along the southern bank of the South Passage in the Changjiang (Yangtze
River) estuary, which is considered as a freshwater resource for Shanghai City. Interaction between runoff and tide is the
main mechanism of the freshwater zone formation. However, the freshwater zone often suffers from saltwater intrusion in dry
season. Tidal oscillation is stronger during spring tides, able to carry freshwater farther seaward. Therefore, it is more
likely to occur during the ebb of a spring tide in dry seasons. In addition, the water zone is sensitive to runoff: when runoff
decreases, it disappears, and vice versa. The northerly winds favor the formation of the freshwater zone. |
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Keywords: | |
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