The Study Of Typhoon Wind Model Based On The Radii Of Wind Circle

In this paper, we compared several kinds of typhoon wind field models which are widely used, the radii of level ten and level seven wind speed calculated by these models are compared with the value released by the meteorological department, found that the errors are relatively large, the maximum absolute error of the radius of level ten wind speed is351km, and the maximum absolute error of the radius of level seven wind speed is1161km. Then a new typhoon wind field model based on the radius of maximum wind speed and the radius of level ten wind speed and the radius of level seven wind speed is proposed, in the area within the radius of maximum wind speed, the wind speed description is divided into two sections, in the area outside the radius of maximum wind speed, the wind speed description divided into three sections. The radius of level ten wind speed and the radius of level seven wind speed calculated by this new model are the same with the value released by the meteorological department, compare the models’typhoon wind speed distributions to the real one, the new model has the best match.Meanwhile, in order to verify the applicability of the new typhoon wind field model, a storm surge numerical model for Ningbo was established in this paper.Then we simulated the storm surge of0509typhoon Matsa and0515typhoon Khanun which influenced Ningbo coast seriously. Adopt different typhoon wind field models to simulate the storm surge process the along Ningbo coast. Comparing the storm surge simulation generated by the new typhoon wind field model with the observed data, the results show that the mean absolute error (MAE) and the absolute error of increased water peak are27.8cm and18.7cm, both smaller than the J-1model results (43.1cm and79.2cm). The simulation results of the new model fit well with the observed data. Thus, the new typhoon wind field model is demonstrated be applicable in the storm surge simulation.