713C雷达资料在定量降水及人工增雨中的应用

Application of the 713C radar data in the ration rainfall and artificial precipitation

为了更好地发挥713C雷达的作用,使其应用于定量估测降水,人工增雨作业条件的选择及效果评估工作,根据2007年5—9月的观测资料,分析了层状云与对流云的降水回波特征,得出了宁夏中卫地区稳定性层状云降水雷达回波强度一般小于20dBz,回波高度为4～5km;混合性层状云降水的回波强度为20～40dBz,高度为5～10km;对流云降水的强中心回波强度为40dBz,高度为8～13km.根据雷达与雨量计观测资料,分析了713C雷达在中卫地区的反射率因子(Z)和降水强度(I)之间的关系,并用MATLAB程序计算了相应的A,b值.结果表明,713C雷达增雨的有利回波条件是,回波强度为20～40dBz,高度为5～10km.应用雷达回波资料,Z—I关系,进行人工增雨有重要意义.

In order to make 713C radar play well, get the choice and effect assessnent of the quantitative precipitation estimation and artificial precipitation enhancement. In this paper, based on the data of the 713C radar from May to september in 2007, we analyzed the characteristic of rainfall echo for stratiform cloud and convective cloud, learned that the intensity of radar echo of the stable stratiform Cloudwas lower than 20 dBz, the height echo was 4 to 5 kin, the echo intensity of mixed stratiform rainfall was 20 to 40 dBz, the height was 5 to 10 km, the echo intensity of convective cloud rainfall was higher than 40 dBz, the height was 8 to 13 kin. From the data of radar and rain-gauge, we analyzed the Z-I relationship of Zhongwei, calculated the value of A and b by MATLAB program. The results showed that its intensity of radar was 20 to 40 dBz, height was 5 to 10 kin. Using the radar echo date, the relationship the radar reflectivity Z and intensity of rainfall I, we can verify the effect of the rainfall enhancement operation.