Numerical Model of Storm Surge Based on the Data Assimilation Method
The wind stress drag coefficient is a vital parameter in the storm surge model.Based on the two-dimensional numerical storm surge model and the adjoint assimilation mod-el,the wind stress drag coefficient with spatial distribution characteristics is inverted by data assimilation methods.Subsequently,we investigate the effects of spatially distributed wind stress drag coefficients and wind stress drag coefficients obtained from three empirical for-mulations on the storm surge levels during the Typhoon 7303 in the Bohai Sea,Yellow Sea,and East China Sea,respectively.The result shows that the storm surge levels calculated by the spatially distributed wind stress drag coefficients are closer to the observed levels than those simulated by the wind stress drag coefficients obtained from the empirical formulas.It indicates that the data assimilation method can effectively improve the simulation accuracy of the storm surge levels.Further,we investigate the influence of astronomical tides on storm surge levels using data assimilation method.When the M2 tide is considered,the calculated storm surge level is the closest to the observation.Therefore,the influence of astronomical tides should be considered when simulating storm surge level.
万方数据
维普
