PROGRESS IN GEOGRAPHY ›› 2011, Vol. 30 ›› Issue (5): 550-556.doi: 10.11820/dlkxjz.2011.05.005

• Original Articles • Previous Articles     Next Articles

Annual Variation of Heihe River Runoff during 1957-2008

GUO Qiaoing1, YANG Yunsong2, CHANG Xiangsheng3, CHEN Zhihui3   

  1. 1. Institute of Resource & Environment, Henan Polytechnic University, Jiaozuo 454003, Henan, China;
    2. Institute of Economics & Management, Henan Polytechnic University, Jiaozuo 454003, Henan, China;
    3. Heihe River Basin Bureau, Lanzhou 730000, China
  • Received:2010-08-01 Revised:2011-02-01 Online:2011-05-25 Published:2011-05-25

Abstract: Based on the observed monthly streamflow of 2 key hydrological control stations in Heihe River Basin since 1950, by using nonuniformity coefficient and concentration degree (period) ,we studied the intra-annual change. The Mann-Kendall test and the cumulative filter methods were employed to detect the trends of intra- annual runoff. The results indicate that: 1) Generally, the annual runoff distribution reached a maximum in July at Yingluoxia, and the curve of it had a single peak value. At Zhengyixia the annual runoff reached the minimum in May and November and reached the maximum in July and September, and the curve of it had two valleys; 2) the inhomogeneity and concentration degree of the runoff in the 1950s reached the maximum, while those in the 2000s hit the lowest. The maximum runoff appeared in July at Yingluoxia. At Zhengyixia the inhomogeneity and concentration degree of the runoff in the 1990s and 2000s reached the maximum, while those in the 1960s hit the lowest. The maximum runoff appeared in August and December; 3) the monthly runoff at Yingluoxia presented an increasing trend since 1957 except in July, but at Zhengyixia the monthly runoff had a descending trend except in September.

Key words: concentration degree (period), Heihe River Basin, intra-annual change, Mann-Kendall, monthly runoff