Changes in stream flow regime in headwater catchments of the Yellow River basin since the 1950s

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	Changes in stream flow regime in headwater catchments of the Yellow River basin since the 1950s
	Liu Changming; Zheng Hongxing
	2007
关键词	Catchments Climate change Rain Statistics Stream flow
英文摘要	The headwater catchments of the Yellow River basin generate over 35% of the basin's total stream flow and play a vital role in meeting downstream water resources requirements. In recent years the Yellow River has experienced significant changes in its hydrological regime, including an increased number of zero-flow days. These changes have serious implications for water security and basin management. We investigated changes in stream flow regime of four headwater catchments since the 1950s. The rank-based non-parametric Mann-Kendall test was used to detect trends in annual stream flow. The results showed no significant trend for the period 1956 to 2000. However, change-point analysis showed that a significant change in annual stream flow occurred around 1990, and hence the stream-flow data can be divided into two periods: 1956-1990 and 1991-2000. There was a considerable difference in average annual stream flow between the two periods, with a maximum reduction of 51%. Wet-season rainfall appears to be the main factor responsible for the decreasing trend in annual stream flow. Reductions in annual stream flow were associated with decreased interannual variability in stream flow. Seasonal stream flow distribution changed from bimodal to unimodal between the two periods, with winter stream flow showing a greater reduction than other seasons. Daily stream flow regime represented by flow duration curves showed that all percentile flows were decreased in the second period. The high flow index (Q5/Q50) reduced by up to 28%, whereas the reduction in the low flow index (Q95/Q50) is more dramatic, with up to 100% reduction. Copyright © 2006 John Wiley & Sons, Ltd.
出处	Hydrological Processes
卷	21 期:7 页:886-893
收录类别	EI
语种	英语
内容类型	EI期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/24352]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Liu Changming,Zheng Hongxing. Changes in stream flow regime in headwater catchments of the Yellow River basin since the 1950s. 2007.