摘要
利用河北省深州地区5个降雨站近30年资料分析了该地区降雨量变化的多时间尺度特征。结果表明:该地区降雨量年内分配极为不均,主要降雨量集中在7月、8月份;30年降雨量呈现微弱下降趋势,且年际变异大。近30年降雨量呈现明显阶段性,依据丰枯特点可分为四个阶段。小波分析表明年降雨量具有5年和10年尺度周期,并揭示了两个主周期震荡强弱和相位波动的年间分布情况,最后还分析了降雨突变年份并利用时序累积曲线法对结论进行了验证。
The multiple time scale-character of rainfall in Shenzhou region of Hebei province was analyzed in this study,with 30-year observation records of five rainfall gauges in the area.The results showed that the monthly distribution of precipitation was not of uniformity within one year,and the sum of rainfall in July and August represented a major component.Rainfall in recent 30 years was characterized by a slight decline with sharp yearly-variation.Wet-dry alternation of precipitation was observed and thus 4 phases could be divided from 1978 to 2008.Furthermore,two main periods namely 5-year and 10-year respectively were found out with Morlet wavelet analysis method,which could also reveal yearly intensity and phases fluctuations of these two main periods.The change points of rainfall were presented and it was proved to be identical with the conclusion based on time-series-cumulative-curve method in the last part of the paper.
出处
《南水北调与水利科技》
CAS
CSCD
2010年第3期79-82,共4页
South-to-North Water Transfers and Water Science & Technology
基金
"十一五"国家科技支撑计划项目(2007BAD69B03)
关键词
降雨量
多时间尺度
小波分析
周期
突变
深州地区
rainfall
multiple time scale
wavelet analysis
periodic
change points
Shenzhou region
