Novel typhoon field mode for storm surge simulation

Abstract

The invention provides a novel typhoon field mode for storm surge simulation, which comprises an air pressure formula, a gradient wind speed formula, a synthetic wind speed formula and a maximum windspeed radius formula of typhoon, and constructs a novel parameterized typhoon field mode for storm surge simulation so as to improve the accuracy of storm surge simulation and forecast. An air pressure formula is provided according to typhoon profile characteristics, sea surface resistance is considered to correct a gradient wind control equation, a novel gradient wind field formula is derived, and the relation between the maximum wind speed radius and center air pressure is determined, so that a novel typhoon field parameterization mode is provided, and a typhoon field calculation method in typhoon storm surge numerical simulation is improved. Typhoon profile data is adopted to verify the new mode, and compared with famous vine field high bridges and Holland modes, the result shows that the wind speed field precision provided by the typhoon field mode for typhoon storm surge forecasting is the highest.

Description

technical field [0001] The invention belongs to the field of marine disaster prevention and reduction, and in particular relates to a novel typhoon field model for storm surge simulation. Background technique [0002] The accuracy of typhoon surge numerical simulation is closely related to the accuracy of typhoon field calculation. The calculation method of typhoon field in typhoon surge simulation is significantly different from that in meteorology. Due to the large impact range of typhoon surge and the fast moving speed of typhoon, it is impossible to use numerical models for typhoon field and storm surge synchronously under the existing technical conditions. Therefore, the numerical simulation of typhoon surge requires a parameterized typhoon field model. [0003] The parameterized typhoon field is composed of pressure field and wind speed field, which respectively affect the changes of tide level and flow velocity in storm surge simulation. In the area affected by typh...

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Problems solved by technology

These models can describe the pressure field more accurately, but there are still some shortcomings. For example, the V.Bjerknes model is not applicable to the calculation of the pressure in the outer area of ​​the typhoon, and the Fujita-Takahashi and Myers models are difficult to accurately express the pressure near the center of the typhoon

Although the Holland model can accurately describe the air pressure field, due to the existence of scaling parameters a and b, it increases the difficulty of model debugging

In addition, when considering the wind speed field, the existing parametric typhoon field models usually substitute the air pressure formula into the gradient wind equation to obtain the wind speed field. These models often multiply the coefficient to solve the problem of the lack of resistance in the gradient wind formula. Even when the simulated pressure field and When the difference between the measured values ​​is small, there is still the problem that the calculated wind speed is too large, which leads to insufficient simulation accuracy of the storm tidal current speed and cannot describe the wind speed field well.

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