两块冰雹云催化防雹效果分析

Analysis on Hail Suppression Effect by Catalyse to Two Hailclouds

为了研究防雹技术、客观评价人工防雹效果和减轻冰雹灾害损失,采用物理效果检验方法中的对比方法,分析了2007年7月24日两块冰雹云防雹作业前后动态雷达回波特征。对雹云A实施防雹作业1次,最大回波强度减少10 dBz,45 dBz回波顶部高度降低0.8 km,云体加宽、减弱。平面显示,回波面积扩大,云体分裂,移动停止,并与后面的云团反向合并。对B块冰雹云实施防雹作业4次,作业后云顶高度下降范围1.3~0.4 km,平均降低0.85 km;45 dBz顶部高度下降0.9~0.4 km,平均降低0.65 km。平面显示：前2轮作业后,云体分裂成2个单体,面积增大,第3、4轮防雹作业后云体面积继续扩大、分裂。两块冰雹云的高炮人工防雹作业有效。

In order to study scientificity of artificial hail suppression and evaluate objective effect of hail suppression and reduce disaster of hail,using the comparative method in the physical validity checking theory,the evolution of 711-type radar echo of two hail clouds before and after hail suppressions on July 24,2007 have been analyzed.The results show that,after the one times hail suppression,the maximum echo intensity of A hailcloud is decreased 10 dBz and the 45 dBz echo top height is lowered 0.8 km and its width is increased and echo intensity is weakened and echo is expanded and split and stopped moving and combined behind clouds the reverse merger on PPI.After the four times hail suppression,the echo top height of B hailcloud is lowered 1.3~0.4 km（average 0.85 km） and the 45 dBz echo top height is lowered 0.9~0.4 km（average 0.65 km） and echo is split two parts and expanded after the previous two operations and echo area continues to increase and split after the last two operations.Therefore,the artificial hail suppression to two hail clouds is effective.