论文部分内容阅读
根据长江干流宜昌站、汉口站、大通站1950-2013年的年径流量和1954-2013年的年输沙量数据,采用小波分析、相关分析和双累积曲线分析等方法,分析三个水文站的水文序列的周期性特征及水沙关系的变化。分析结果显示:三个水文站的水沙序列存在多时间尺度变化特征,大尺度波动中有小尺度震荡,年径流量变化存在着16~17年、7~9年和2年的主要周期,年输沙量变化存在17~18年、9年、2~3年的主要周期;长江干流年径流量和年输沙量存在一定的相关关系,但受水利工程建设等人类活动的影响,相关关系不断变化。研究结果对研究气候变化和人类活动对长江干流水沙特征的影响有一定的参考价值。
Based on the annual runoff of Yichang station, Hankou station and Datong station from 1950 to 2013 and the annual sediment discharge data from 1954 to 2013 of the main stream of the Yangtze River, the wavelet analysis, correlation analysis and double cumulative curve analysis were used to analyze three hydrological stations Periodic characteristics of hydrological sequences and the relationship between water and sediment. The results show that there is a multi-time scale variation in the water and sediment sequences of the three hydrological stations and small-scale oscillations in the large-scale fluctuations. There are 16 to 17 years, 7 to 9 years and 2 years of major annual fluctuations in annual runoff, Annual sediment discharge changes exist 17-18 years, 9 years, 2-3 years of the main cycle; annual runoff and annual sediment discharge in the Yangtze River there is a certain correlation, but the water conservancy projects and other human activities, the impact of The relationship is constantly changing. The results of this study have certain reference value for studying the influence of climate change and human activities on the characteristics of water and sediment in the Yangtze River.