海面风场订正对风暴潮数值模拟的影响

Impacts of the Sea-Level Wind Field Correction on the Numerical Simulation of Storm Surges

海洋模式在模拟风暴增水时对于风场的依赖性比较大,准确的风场模拟是正确模拟风暴潮的重要前提。用渤海海域4次典型的风暴潮个例,检验改良的渤海风场推算模式对风暴潮数值模拟的影响,分别用订正前后的风场驱动风暴潮数值模式得到逐时的渤海增水场,并与塘沽实测值比较表明:在4个过程中海面风场订正后风暴潮模式的模拟结果均得到了明显的改进,模拟的风暴潮增水极值、增水过程曲线以及渤海增水场都与实测值吻合很好。与风场订正前相比,计算结果的精度均有明显提高。研究结果表明通过采用合适的海面风场订正办法提高数值模式模拟的风场精度后,海洋模式可以模拟出与实际比较接近的强风暴增水。

Simulated storm surge elevation by the oceanic model is strongly dependent on the wind field, thus the correct simulation of wind field is the important prerequisite.Four typical cases are used to test the impacts of the modified Bohai Sea calculated wind field models on the numerical simulation of storm surges.The hourly Bohai Sea elevation fields before and after the correction are obtained by the numerical model driven by the wind field.Compared to the observed values of Tanggu Station,we can conclude that the simulated results are obviously improved.The simulated extreme values,process curves and the elevation correspond well to the observed values.The accuracy of the calculation results is enhanced significantly after the correction.Results show that by using the appropriate method of sea-level wind field correction, the accuracy of the simulated wind field is enhanced and the oceanic model can simulate the strong storm surge elevation that is close to the reality.