台风天气下通州湾港区附近海域风暴增水分布研究

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

为规划通州湾港区建设,考虑极端天气下海域风暴增水的影响。以Holland台风模型和ERA5再分析气象资料作为驱动,基于Delft3D模型与ADCIRC模型构建大小嵌套的风暴潮数学模型。根据移行路径对1945—2021年间影响通州湾海域的台风进行科学分类,包括北侧掠过型、东侧掠过型、南侧掠过型、西侧掠过型和直接穿过型,每类选取3场典型台风,复演选取的15场典型台风过程,计算分析极端天气下通州湾港区海域的风暴增水分布特征。研究结果表明:通州湾港区附近海域在台风风暴极端天气下最大增水为0.5~1.0 m,以大洋港深槽、冷家沙外侧水道为中心往外海逐渐减小,南侧掠过型台风期间出现风暴增水极大值。通州湾增水大小与台风风场引起的风暴流场时空变化直接相关。

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.