摘要
利用岷江中上游及青衣江流域内松潘、成都、雅安、乐山4个气象站点1951─2001年共51年的降水资料,运用Mann-Kendall秩次相关检验法、Morlet小波变换等方法,分析了降水变化特征。结果表明:①4站年内降水集中在汛期4─9月,均占全年降水的80%以上。②4站年降水量的年际变化趋势不明显,松潘站在1958─1975和1985─2001两个时间段内降水减少,减少趋势不显著;雅安站降水呈一致减少趋势,但趋势不显著;成都站从1969年降水开始减少,且1996─2001年降水减少趋势显著;乐山站从1967年开始降水呈减少趋势,且1991─2001年降水减少趋势显著。③松潘和乐山站的降水量存在明显的年际和年代际振荡周期,而雅安和成都站的年代际周期不明显。
The precipitation data of 1951-2001 at Songpan,Chengdu,Ya＇an and Leshan weather station in Minjiang Upriver and Qingyijiang River Basin were analyzed by Mann-Kendall method and Morlet wavelet transform. It is reviewed that： （1）the most annual precipitation focused in flood season, accounted for more than 80% of the total; （2）the changing trends of precipitation of the four stations were not evident. The two descending time areas at Songpan station were 1958-1975 and 1985-2001 ,and the trend was unapparent; The descending trend of Ya＇an station was also unconspicuous;The precipitation of Chengdu station had reduced since 1969 and got a obvious declining in 1996-2001;The precipitation of Leshan descending obviously in 1991-2001 ;（3）the precipitation at Songpan and Leshan appeared obviously annually and interdecadal oscillation peri ods,and the interdecadal periods are inapparent at Ya＇an and Chengdu station.
出处
《南水北调与水利科技》
CAS
CSCD
2008年第3期46-48,53,共4页
South-to-North Water Transfers and Water Science & Technology
基金
国家科技支撑计划重大项目课题“南水北调西线工程对调水区生态环境影响评估及综合调控技术”(2006BAB04A08)
科技部科研院所社会公益研究专项“南水北调西线工程水源区水资源评估技术研究”(2005DIB3J057)
关键词
岷江中上游及青衣江流域
降水
趋势
降水周期
Minjiang upriver and Qingyijiang river basin
precipitation
trend
precipitation cycle
