单多普勒雷达风场反演方法敏感性试验

为了比较3种单多普勒天气雷达风场反演方法(即VAP方法、UW方法、涡度-散度法)的反演效果和适用性,用这3种方法对几种典型的理想风场进行反演和敏感性对比试验,并对造成反演效果差异的原因进行了细致的分析.试验结果表明,这3种方法对均匀风场的反演效果都很好,UW方法的误差最小且计算量较小;3种方法对切变场的反演效果类似,径向速度差值较大的UW方法相似系数却稍大,切变越大时反演误差越大;对于涡旋场3种方法反演效果都不理想,若为径向气流显著而切向气流不显著的涡旋场可以用UW方法来反演.因此,相对而言,可以选用计算量小且相似系数较高的UW方法来反演二维简单风场.而在研究和实际应用中,应该进一步探讨用假设条件更接近实际情况的反演方法来更准确地反演风场.

Sensitivity experiments of retrieving horizontal wind field with single Doppler radar radial velocity data

Three methods of the retrieval of horizontal wind field with a single Doppler radar radial velocity data were presented.They were VAP method,UW method and Vortex-Divergence(V-D for short) method.Sensitive and contrastive experiments were done to compare these methods.The results show that they are all suitable for even wind field and V-D method is better than the other two for the shear field.These methods are not good enough for the vortex,but the results are better when there is only radial velocity,especially using the V-D method.When there is only tangential velocity,the results are poor.The differences in the experiments between the three methods were also discussed.