长江流域汛期降水集中程度和洪涝关系研究  

A STUDY ON THE FEATURE OF PRECIPITATION CONCENTRATION AND ITS RELATION TO FLOOD-PRODUCING IN THE YANGTZE RIVER VALLEY OF CHINA

作　　者：张录军[1] 钱永甫[1] 

机构地区：[1]南京大学大气科学系,南京210093

出　　处：《地球物理学报》2004年第4期622-630,共9页Chinese Journal of Geophysics

基　　金：国家自然科学基金 ( 4 0 175 0 2 1;40 2 3 3 0 3 7)资助

摘　　要：运用新定义的降水集中度和集中期分别讨论了我国长江流域不同地段汛期降水在时间和空间上的分布特征和变化规律 .结果表明在对长江流域旱涝灾害研究方面 ,降水集中度和集中期能够定量地表征降水量在时空场上的非均匀性 ,提取出最大降水重心对应的时段 ,因此可以比较理想地分析旱涝灾害发生的基本特征及其形成机制 .Based on the precipitation-concentration degree (PCD) and precipitation-concentration period (PCP), we analyze the characteristics of spatial and temporal distribution and variation of precipitation in the Yangtze River Valley. It is proved that these two parameters can display the temporal inhomogeneity in the precipitation field, and pick up the corresponding period of the largest precipitation amount in theoretical analyses of floods and droughts in the Yangtze River Valley. Thus the basic characteristics and mechanism of flood and drought can be fairly analyzed. And it is also found that there is a good relationship between the precipitation-concentration degree and the East Asian monsoon index in the middle and lower reaches of the Yangtze River.

关 键 词：降水集中度 降水集中期 时空分布 东亚季风指数 

分 类 号：P426[天文地球—大气科学及气象学]