PROGRESS IN GEOGRAPHY ›› 2010, Vol. 29 ›› Issue (2): 166-172.doi: 10.11820/dlkxjz.2010.02.006

• Original Articles • Previous Articles     Next Articles

The Study on Affecting Factors of Runoff Changes at Yingluoxia Station of Heihe River

YANG Mingjin, ZHANG Bo   

  1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
  • Online:2010-02-25 Published:2010-02-25

Abstract:

Based on the runoff data covering 45 years at Yingluoxia Station at the main stream of the Heihe River, this paper studied the global change, sunspot activity, ENSO cycle and underlying surface variation affecting the change of mountainous runoff at the main stream of the Heihe River using correlation analysis, cross-spectrum analysis, statistical law analysis and precipitation-runoff double mass analysis. The results showed that: (1) The global change had significant influence on the runoff of Yingluoxia Station; (2) The runoff of Yingluoxia Station and the number of sunspots were closely related with the vibration periods of 2 and 3.3 years, but vibration period change of the number of sunspots lagged behind the runoff of Yingluoxia Station; (3) The ENSO cycle had some influence on the runoff of Yingluoxia Station, while the influence of El Nino and La Nina sustained shortly, which could only exert some effect on the runoff of Yingluoxia Station when they occurred obviously, but they affected the next year's runoff weakly; (4) The underlying surface variation had a weak influence on the runoff of Yingluoxia Station.

Key words: affecting factors, ENSO cycle, Heihe River, runoff change, the number of sunspots