| 水文与水资源 |
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| Seasonal Variations of Runoff and Its Wavelet Correlations with Regional Climate in Source Region of the Yellow River |
| SUN Wei-guo1, CHENG Bing-yan2, LI Rong3 |
| 1.College of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China; 2.Climate Center of Chongqing City, Chongqing 401147, China; 3.Zhengzhou Meteorological Bureau, Zhengzhou 450005, China |
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Abstract The cross wavelet transform method is adopted to analyze the runoff characteristics in time and frequency domains and the multi-time scale correlations between the runoff and regional precipitation, evaporation, maximum temperature and minimum temperature in source region of the Yellow River. The results show that runoff in source region of the Yellow River have interannual and interdecadal periodic variations and there are significant periods at scale of 2~4 a, 6~8 a and 12~22 a. In summer and autumn, the coherence of positive correlation oscillations at interannual and interdecadal scale between the runoff and regional precipitation is the highest and the correlation degree in autumn is higher than in summer. The coherences of interdecadal correlation oscillations in summer between runoff and regional evaporation, maximum and minimum temperature are higher than in autumn, and the phase differences of them show that responding times of the runoff variations to the regional evaporation and temperature anomalies are also different. In winter and spring, the high coherence of correlative oscillations between the runoff and maximum and minimum temperature exhibit on syntony periods at interannual scales. Negative correlation between the runoff and maximum temperature in spring is higher than in winter, and positive correlation between the runoff and minimum temperature in winter is higher than in spring. The primary factor of the runoff variations in flood season in source region of the Yellow River is the regional precipitation, while the maximum temperature and the minimum temperature have important influence on the runoff variations in low-water seasons. Mechanism of climatic elements influencing the runoff variation in different seasons is different, and responses of the runoff variation to regional climate anomalies are different. The runoff variations in source region of the Yellow River are resulted from the conjunct influence of climatic elements.
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Received: 11 October 2009
Published: 20 May 2010
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2010, Vol. 30 
