确定Z-I关系的几种方法及其在定量测雨中的精度

METHODS FOR DETERMINING Z-I RELATION AND THE ACCURACY IN THE QUANTITATIVE RAINFALL MEASUREMENT

摘要:

本文介绍用雨滴谱、Z_r～I_g(Z_雷～I_计)、A值平均、平均A值几种Z～I关系测定单点累计降水量的方法。以1981年三次降水过程资料为例求得各种Z～I关系,并对1980年6月24日和7月9日两次资料进行检验,结果表明几种方法的精度都较好.只要提高测定Z、I值精度.在Z～I关系中选取适当的b值,再分雨型统计Z～I关系,则后两种方法的精度还可再提高。

Abstract:

Several methods are presented for the determination of accumulative amount of precipitation at a single location by means of Z-I relations,such as raindrop size spectra, Z_r-I_g, mean of value A and mean value of A. Data from the three processes of precipitation in 1981 were used to determine Z-I relations and verify the data obtained on June 24 and July 9, 1980.It is found that the accuracy of these methods are quite satisfactory.If only the accuracy in measuring I and Z can be improved and the Z-I relations classified according to the type of rainfall after the value is properly chosen for b in the relations, greater accuracy of the last two methods may be achieved.