Investigating storm surge level distribution in Tongzhou Bay’s port area during typhoons

In the strategic planning for Tongzhou Bay Port Area construction, we assess the impact of storm surges during extreme weather. Employing the Holland typhoon model and ERA5 re-analysis data, we establish a two-level nested storm surge model using Delft3D and ADCIRC. Typhoons affecting Tongzhou Bay from 1945 to 2021 are categorized by tracks: north, east, south, and west side skimming, and direct passing. Three representative typhoons of each type undergo simulation for storm surge processes. Analyzing simulated results reveals storm surge level distribution in the port area during typhoon conditions. Findings indicate varying maximum water levels (0.5 m to 1.0 m) near Tongzhou Bay Port, decreasing from Dayanggang and Lengjiasha troughs to the open sea. Water level increase in Tongzhou Bay correlates with spatiotemporal changes in storm flow fields induced by typhoon winds.