【摘要】 该文应用W-M-W(Wilcoxon-Marn-Whitney)和Wilcoxon带符号的秩和检验等非参数方法,对1990年两次飞机增雨进行了效果检验。检验结果表明:作业开始后3小时“卷流区”和“非卷流区”的雨量有显著性差异;作业前3小时与“卷流区”相对应的同一区域雨量与作业开始后3小时“卷流区”的雨量有显著性差异。主要是由人工播撒造成的。文章对增雨效果及其显著程度进行了定量估计。更多还原

【Abstract】 In order to understand the effect of the twice artificial precipitations by air-craft in 1990,the non-parameter techniques by W-M-W(Wilcoxon-Marn-Whitney)and Wilcoxon are used. The results show that the rainfalls vary in great amount between the plume area and non-plume area in 3 hours since operating. And the significant variations are also found in the plume area between 3 hours after and 3 hours before operating. Therefore,it is easy to understand that artificial seeding brings out the significant increment of rainfall. The rainfall inhencement are estimated quantitatively.更多还原