基于海浪谱的风暴潮海浪数值仿真与功率谱估计

Numerical simulation and power spectrum estimation of storm surge based on wave spectrum

基于随机海浪的数学模型,采用改进的JONSWAP谱,以最高风暴潮位对应的有效波高和平均周期作为海浪谱的特征参数;利用谱分析法,通过MATLAB编程实现了风暴潮浪的数值仿真,模拟得到的风暴潮极值潮位与文献所给的试验数据较为吻合。最后,根据welch算法基本原理,利用MATLAB中的pwelch函数对海浪的仿真结果进行了功率谱估计,证明其仿真效果良好。

Based on the mathematic model of random wave, the corresponding significant wave height and average period are chosen as characteristic parameters of the modified JONSWAP spectrum when the tidal level of storm surge reached highest. Numerical simulation of storm surge wave is realized by using spectrum analysis method and MATLAB programming. The simulated extreme tidal level of storm surge is consistent with the experimental data of reference. Finally, according to the basic principle of Welch algorithm, pwelch function in MATLAB is used to estimate the power spectrum of the wave simulation results.It is proved that the effect of simulation experiment is good.