摘要
分析了1952—2002年广东省持续性暴雨的气候特征，结果表明：地形对持续性暴雨的分布有重要影响，持续性暴雨的中心主要分布在沿海地区，粤中地区是次多发区。持续性暴雨中心主要在沿山体南侧分布，即迎风向的山前和迎风坡，前汛期主要以沿海的恩平、阳江和斗门为中心；后汛期主要以海丰、南澳为中心。全省各站都以持续2d的暴雨为主，持续性暴雨在前汛期发生的次数比后汛期多，最多的月份是6月。全省全年及前后汛期持续性暴雨次数的年代际变化相似；但从年际变化看，前汛期与全年发生持续性暴雨次数呈正相关关系，而后汛期与之则呈现一定的反相关关系。持续性暴雨有20～25a的长周期变化和2～4a的短周期振荡。
The climatic characteristics of persistent rainstorm are analyzed by using the rainstorm observational data from 86 meteorological stations in Guangdong Province during 1952-2002. It is shown that the geographical and topographical characteristics have a very important effect on the distribution of persistent rainstorm in Guangdong. Geographically, the centers of persistent rainstorm are mainly located in the coastal areas, and secondly in the middle of Guangdong. Topographically, they are mainly along the south of the mountains, namely windward slopes and the areas in front of the mountains. In the pre-flood season, the centers are at Enping, Yangjiang and Doumen. In the post-flood season, they are mainly at Haifeng and Nan＇ao. Persistent rainstorm often lasts two days in Guangdong. It happens more in the pre-flood season than in the post-flood season, and the most in June. The secular-variation characteristics of the occurrence times in pre-flood, post-flood seasons and in a year are similar. As for the times of persistent rainstorm occurrence, the correlativity is plus between pre-flood and the whole year, but negative between pre-flood and post-flood. There are a long variation cycle of twenty to twenty-five years and a short variation cycle of two to four years in secular variation of persistent rainstorm.
出处
《热带地理》
2008年第5期405-410,共6页
Tropical Geography
基金
国家重点基础研究发展计划(973)项目(2004CB418303)
佛山市科技发展专项资金项目(200609001)
关键词
广东省
持续性暴雨
地理分布
时间变化
Guangdong
persistent rainstorm： geographical distribution
temporal variation
