柘溪水库流域不同云型VIL特征与地面催化作业方式的探讨
2015-10-21邹燕姿

摘要 利用常德CINRAD S/B多普勒天气雷达获取的雷达资料中的垂直累积液态含水量(VIL)产品分析了柘溪水库库区不同季节降雨云的垂直累积液态含水量和面积值,并将VIL值与降雨关系进行了对比分析。结果表明,积层混合云液态含水量各个量级的覆盖范围均比较广,且最大液态含水量可达30 kg/m2,对应降水区域广、降水总量大,降水效率为20%左右,增雨潜力大,是开展人工增雨的首选云型;多普勒天气雷达作业临界判据为组合反射率因子>25 dBz、强中心强度>30 dBz、回波顶高>4.5 km、水平尺度>5 km、VIL>8 kg/m2、持续时间>10 min。
关键词 多普勒天气雷达;VIL;地面催化作业方式 ;云型;柘溪水库流域
中图分类号 S163 文献标识码
A 文章编号 0517-6611(2015)03-233-03
The VIL Characteristics of Different Cloud Patterns and Discussion of Ground CloudSeeding Operation Means in Zhexi Reservoir Drainage Area
ZOU Yanzi1,2
(1. School of Public Administration of Central South University, Changsha, Hunan 410000; 2. Hunan Meteorological Bureau, Changsha, Hunan 410007)
Abstract This article used VIL products obtained by Changde CINRAD S/B Doppler radar to analyze the VIL and area value of rainfall cloud in different seasons in Zhexi reservoir drainage area, and compared VIL value to rainfall relation. The results suggested that the various level VIL in lamination mixed cloud involved abroad, the greatest amount is up to 30 kg/m2. The chief cloud suitable to catalyzed should be hold broad precipitation area, large rainfall and potential, about 20% precipitation efficiency. The operation criterion based on Doppler radar products included that the value of combinedreflectivity is more than 25 dBz, and its echotop is more than 4.5 km, and the maximum reflectivity is more than 30 dBz, and its horizontalscale is more than 5 km, the value of VIL is more than 8 kg/m2 and its persistence time is more than 10 min.
Key words Doppler radar; VIL; Ground cloudseeding operation means; Cloud patterns; Zhexi reservoir drainage area
作者简介 邹燕姿(1977- ),女,湖南平江人,工程师,硕士,从事气象防灾减灾业务与管理工作。
收稿日期 20141205
我國是水资源缺乏的国家,而空中云水资源是可再生气象资源,如何拦截过境空中过境云水资源,促进云的降水效率以增加地面水资源是值得研究的内容。湖南省的水电在全省供电系统中占有很大的份额,柘溪水库是湖南省的四大水库之一,在水库供水期合理利用和开发空中云水资源以增加水库蓄水以及增加发电量,必须对其流域空中云水资源进行分析,并研究水库人工增雨的潜力和可能性[1]。笔者利用常德CINRAD S/B多普勒天气雷达获取的雷达资料中的垂直累积液态含水量(VIL)产品,分析了柘溪水库库区不同季节降雨云的垂直累积液态含水量和面积值,并将VIL值与降雨关系进行了对比分析。……p>
