基于SATP和SIFT方法分析雨滴谱特征及参数关系

A Study of Raindrop Size Distributions and Their Characteristic Parameters Based on the Methods of SATP and SIFT

采用二参数排序平均法(the Method of Sorting and Averaging based on Two Parameters,简称SATP方法)分析了2006年吉林省观测的所有雨滴谱分布统计特征,获取其μ-Λ关系。同时,针对单次降水过程利用强度顺序滤波法(Sequential Intensity Filtering Technique,简称SIFT方法),寻找2006年5月4日降水过程的Z-R关系,并得出其μ-Λ关系。最后应用上述两个μ-Λ关系,分别反演雨滴谱并估测降雨量。结果表明,利用SATP法和SIFT法处理雨滴谱资料并获取μ-Λ关系是可行的,反演所得降雨量与实测吻合很好,尤其是SIFT法更具有实用性。它对联合雷达订正降水测量,有效地提高降雨率的测量准确度将有更重要的应用价值。

The micro-structure characteristics of DSDs（Daindrop Size Distributions） and the μ-Λ relation of the DSDs observed in Jilin Province in 2006 are analyzd using the SATP（Sorting and Average based on Two Parameters） method which applied to a whole dataset.In addition,the Z-R relation and the μ-Λ relation in a precipitation event on 4 May 2006,are also determined by the SIFT（Sequential Intensity Filtering Technique） method that is good for analyzing small sample number of DSDs in a single rainfall event.Based on the two μ-Λ relations, the DSDs and the rainfall are investigated.The results show that the methods of SATP and SIFT are feasible in processing DSDs data and getting more reasonable μ-Λ relations.Its retrieval results of rain rate coincide with the observational results.Especially the SIFT method has more powerful and practicable skill to deal with small sample number of DSDs,and has high application value in correction of R measured by radar and raising the accuracy of rainfall estimation.