人工增雨作业中区域雨量估算方法的探讨

Estimation Methods for Regional Rainfall in Artificial Precipitation Operation

利用Surfer8软件的插值法对估算人工增雨作业区域平均雨量进行二次开发,探讨不同属性降水在不同插值法下的雨量分布结果和同一插值法下不同网格距下的雨量分布结果。结果表明,对流性降水的雨量插值方法首选径向基本函数法,混合性降水则以最小曲率法为佳;对流性降水和混合性降水的雨量分布插值网格距以0.1°×0.1°为准;距离平方反比法的区域平均雨量估算值不受网格距变化影响,但明显比算术平均法小;对于对流性降水,另4种插值法在网格距为0.1°×0.1°以下的估算值均比算术平均法小,而对混合性降水另4种插值法的区域平均雨量估算结果基本不受网格距变化影响,且与算术平均法基本相当。

Through secondary development of estimating average rainfall in artificial precipitation operation regions, the rainfall distribution of different attribute precipitations by various interpolation algorithms and the rainfall distribution in different grid intervals by the same interpolation algorithm were studied using interpolation algorithms of Surfer 8. Results showed that the first selected interpolation algorithm for rainfall amount of convectional precipitation was radial basic function method and for mixed precipitation, the least curvature method was best. The interpolation grid intervals for the rainfall distribution of convectional and. mixed precipitation were 0.1°×0.1°. The estimated value of average regional rainfall by inverse distance square method was unaffected by grid interval, markedly lower than that by arithmetic mean method. For convectional precipitation, when the grid interval was 0.1°×0.1° or even smaller, the estimated values by other four kinds of interpolation algorithms were lower than that by arithmetic mean method, while for mixed precipitation, the values were basically unaffected by grid intervals and equivalent to that by arithmetic mean method.