基于大气湍流效应的蒸发波导PJ模型研究

Study on PJ Model of Evaporation Duct Based on Atmospheric Turbulence Effect

本文基于海洋大气近地层相似理论和一维Kolmogorov谱函数,建立考虑各向同性和各向异性湍流效应的蒸发波导模型,并基于相对误差理论,将数值模拟的大气修正折射率与根据试验采集数据计算得到的修正折射率进行对比分析。研究结果表明:湍流效应对蒸发波导模型的预测结果有影响,且考虑各向异性湍流效应的蒸发波导模型预测精度更高。因此在构建蒸发波导模型时,需要考虑各向异性湍流对大气折射率的扰动影响,才能得到更准确的大气修正折射率廓线。通过引入各向异性大气湍流理论,能够有效提升蒸发波导模型的适用性,为后续反演大气波导提供较好的模型基础。

Based on the similarity theory of the ocean atmosphere and the one-dimensional Kolmogorov spectral function,the evaporation duct model considering the isotropic and anisotropic turbulence effects is established.Based on the relative error theory,the modified atmospheric refractivity calculated by numerical simulation is compared with the modified atmospheric refractivity calculated from the experimental data.The results show that the turbulence effects have an influence on the prediction results of the evaporation duct model,and the prediction accuracy of the evaporation duct model considering the anisotropic turbulence effect is higher.Therefore,it is necessary to consider the influence of anisotropic turbulence on the atmospheric refractive index,so as to obtain a more accurate atmospheric modified refractive index profile when building the evaporation duct model.By introducing anisotropic atmospheric turbulence theory,the applicability of the evaporative waveguide model can be improved effectively,which provides a good model basis for the subsequent atmospheric waveguide inversion.