长江科学院院报2017，Vol.34Issue(7)：12-18,7.DOI:10.11988/ckyyb.20160282
50年来灞河流域降水变化特征分析
Characteristics of Precipitation Variation ofBahe River Basin in the Past 50 years
摘要
Abstract
The aim of the present research is to better understanding the characteristics of climate change in the Bahe river drainage basin.The annual and inter-annual precipitation changes, the abrupt change time, and the variation period of precipitation are analyzed based on observations in the past half century.Moving-average method, R/S analysis, Mann-Kendall test, and wavelet analysis are adopted for the research.Results reveal that 1) from 1958 to 2012, precipitation presented a decline trend with fluctuations, and will keep declining in the next several years;2) precipitation is extremely uneven in a year, mainly focused from July to September, decreasing obviously in spring and autumn, and rising slightly in summer and winter;3) Hurst index of precipitation in four seasons are all less than 0.5, and the precipitation series have features of anti-continuity and negative correlation;4) annual precipitation has apparent abrupt change in 1989, and abrupt changes are also found in the spring, summer and autumn in 1994, 1979, and 1985, respectively, with no abrupt change in winter;5) the variation period of annual and seasonal precipitation fluctuates in time scales of 22-29 a, 13 a, and 4-8 a, and the periodic change differs greatly in various scales.关键词
降水变化/灞河流域/Mann-Kendall检验法/R/S分析法/小波分析Key words
precipitation variation/Bahe basin/Mann-Kendall test/R/S analysis/wavelet analysis分类
天文与地球科学引用本文复制引用
宋扬,周维博,马亚鑫,李慧,刘博洋..50年来灞河流域降水变化特征分析[J].长江科学院院报,2017,34(7):12-18,7.基金项目
中国地质调查局地质调查项目(12120113004800) （12120113004800）
