Numerical Simulation of Storm Surge in Jiaozhou Bay Under Wave-Current Coupling: Take Typhoon 9711 as an Example

In order to forecast and prevent storm surge disasters caused by typhoon in Jiaozhou Bay, a two-dimensional nested wave-current coupling numerical model is established in Jiaozhou Bay and its adjacent sea area based on Delft3D numerical simulation software and mixed wind field model. Based on the coupling model, the influence of the extreme value of wave-current coupling surge on the storm surge and Jiaozhou Bay during the influence of Typhoon Winnie on Jiaozhou Bay was simulated and analyzed. The temporal and spatial variation characteristics of the surface flow field of pure wind-driven current and the contribution of wave surge to storm surge surge surge are explored. The results indicate that the astronomical tide level is dominant in the storm surge water level caused by typhoon 9711 in Jiaozhou Bay. The extreme value of wave-current coupling increases with the decrease of superimposed astronomical tide level, and the comprehensive water level decreases with the decrease of astronomical tide level. The maximum increase of wave-current coupling and the high tide level of astronomical tide aggravate the risk of forming an inundation at the northwest of Jiaozhou Bay. In addition, the wave surge in the shallow water area of Jiaozhou Bay is more significant than that in the deep water area.