Author(s): Fengze Zhao; Yuanyi Li; Dekui Yuan
Linked Author(s): Dekui Yuan
Keywords: Bohai Sea; Water exchange; Wave; Water age
Abstract: To protect and improve the water environment in the Bohai Sea, the characteristics and mechanism of water exchange under tide, wind and wave were comprehensive examined in the paper. A coupled hydrodynamic model was constructed to incorporate these factors, and the water age model was set up on this basis. The spatial distribution of residual current and water age were obtained with further analysis of seasonal distribution of age. Based on the topography and wind statistical characteristics of the Bohai Sea, the influence of wave on water exchange was primary analyzed during the extreme conditions. The results show that: 1) Combing the influence of tide, wind and waves, the trend of residual current in the central basin is anticlockwise with several small-scale vortexes in other three bays. The overall circulation characteristics with and without wave driving force have little difference. 2) Under the influence of tide, wind and waves, the water age is concentrated in the Bohai Bay and the top of the Liaodong Bay, while in the Laizhou Bay and the central of the Bohai Sea is relatively small. The effect of waves on water exchange are restricted to local region. 3) Through the analysis of extreme scenes, high wind speed and long wind fetch will lead to wave accumulation. In the nearshore area, the impact of waves is obvious due to wave breaking caused by the shallower topography.
Year: 2024