Delft3D在天文潮与风暴潮耦合数值模拟中的应用

NUMERICAL SIMULATION OF COUPLING STORM SURGE AND ASTRONOMIC TIDE BASED ON Dleft3D

本文应用Delft-3D水动力学计算软件,以长江口地区为例建立的台风风暴潮、天文潮耦合数值预报模型,对台风风暴潮、天文潮两潮耦合预报模式进行探研和分析。该模式不同于以往的单纯台风增水模型与天文潮叠加的风暴潮模式,而是在计算中直接对天文潮和台风风暴潮进行两潮耦合,有效地消除了近岸地区潮波与增水之间叠加的非线性影响。通过模拟台风8114和7708过境对长江口的影响,并与实测数据比较,预报结果和实测水位过程的对比说明,台风风暴潮耦合数值预报模式对增水和高潮的过程预报是准确的,两者在高水位时同步且相差甚微。

In order to study and analyze prediction methods of integrating storm surge and astronomic tide,a coupling mathematic model for the Yangtze Estuary as a case study was established based on Delft3D flow modules.Unlike existing predictions models, which are linear couplings of the results of typhoons inducing water level set up models and astronomic tide models, this model integrated the typhoon influence and astronomic tides directly to avoid the nonlinear influence of coupling between water level set up and astronomic tides in coastal area.By simulating the influence of typhoon 8114 on the Yangtze Estuary and comparing the model results with observation data,it can be drawn that the coupling mathematic model predicted the processes of water level set up and the highest water level accurately with the same phase and small errors at the time of the highest water level occurring.