摘要
为更好地保护洱海生态环境、高效利用水资源,实现湖泊资源的可持续利用提供技术支撑,采用数理统计、趋势法、小波分析等方法,对洱海流域年降水量的地区分布和时空变化,以及年内、年际、多年变化趋势、丰枯变化情况进行分析。研究结果表明:洱海流域年降水量由南向北、由西向东递减,在流域西部和北部,降水量受地形影响较为明显,随高程升高而增大,垂直变化较为显著;降水量主要集中在5月-10月,占全年降水量的84.9%~93.2%,说明该时段降水量较大程度地决定了年降水量,每年11月至次年4月降水量仅占全年降水量的6.8%~15.1%,最大月降水量出现在7月或8月,最小月降水量出现于12月;洱海流域年降水量年际变化相对较稳定,但呈逐年减少的趋势;并存在丰-枯-丰等多个循环交替。
Erhai is plateaulake as well as a shining pearl in Yunnan province.To better protect the ecological environment of the Erhai lake and to take advantage of water resources efficiently,also to achieve sustainable use of lake resources to provide technical support,we use the methods of mathematical statistics,trends,methods of wavelet analysis to analyze the annual rainfall of Erhai lake basin′s area distribution and the temporal and spatial variation during the year,the interannual and change trend for years.The results showed that the Erhai lake basin precipitation decreases from south to north,from west to east,rainfall concentrated in 7~9 months,and presents the tendency of reducing year by year,at the same time,the annual precipitation follows the multiple circulations from abundant-drain-abundant.
作者
李芸
李宝芬
张坤
朱俊
LI Yun;LI Bao-fen;ZHANG Kun;ZHU Jun(Yunnan Province Hydrology Water Resources Bureau,Kunming 650051,China)
出处
《南水北调与水利科技》
CSCD
北大核心
2017年第A02期33-37,共5页
South-to-North Water Transfers and Water Science & Technology
关键词
洱海
流域
年降水量
特征
Erhai
basin
annual precipitation
characteristics
