摘要
本文用711测雨雷达实测的冰雹云过程回波资料,分析了大小回波在雹暴形成中的演变过程以及回波强度和回波高度间的关系。结果表明永登防雹试验区回波覆盖面积比最大频数时为3.64%,平均为7%,回波块数最大频数为6块,平均为6块;回波覆盖面积比与雹日的月际变化呈正相关,回波块数与雹日的月际变化呈负相关;回波厚度在识别雹云中有重要意义。
The evolvement of echo during the formation of hail storm and the relation of echo intensity with its height are analyzed by use of echo data.of the 711 rain radar. The results show that the ratio of echo area in Yongdeng test field to the maximum frequency is 3.64% and the average is 7%. For the echo number, the maximum frequency is 6 and the average is 6. The ratio of echo area to the total area has a positive correlation with the month change of hail day and the echo numbers are negatively correlated with month change of hail day. The thickness of echo is very important in identification of hailstorm.
出处
《灾害学》
CSCD
2004年第4期63-67,共5页
Journal of Catastrophology
基金
科技部2002年社会公益研究项目资助(2002DIB10046)
关键词
雹云
回波
特性
甘肃永登
hail cloud
echo
characteristics
Gansu
