Temporal and spatial patterns of low-flow changes in the Yellow River in the last half century |
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| Authors: | Tao Yang Chong-Yu Xu Quanxi Shao Xi Chen Gui-Hua Lu Zhen-Chun Hao |
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| Institution: | (1) State Key Laboratory of Hydrology-Water Resources and Hydraulics Engineering, Hohai University, 210098 Nanjing, China;(2) Yellow River Institute of Hydraulic Research, 450003 Zhenzhou, China;(3) Department of Geosciences, University of Oslo, P.O. Box 1047, Blindern, 0316 Oslo, Norway;(4) CSIRO Mathematical and Information Sciences, Private Bag 5, Wembley, WA, 6913, Australia;(5) Hydrology Bureau, Yellow River Conservancy Commission, 450004 Zhengzhou, China;(6) State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, 430072 Wuhan, China; |
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| Abstract: | Low-flow is widely regarded as the primary flow conditions for the anthropogenic and aquatic communities in most rivers, particularly
in such an arid and semi-arid area as the Yellow River. This study presents a method integrating Mann–Kendall trend test,
wavelet transform analysis and spatial mapping techniques to identify the temporal and spatial patterns of low-flow changes
in the Yellow River (1955–2005). The results indicate that: (1) no trend can be identified in the major low-flow conditions
in the upper Yellow River, but downward trends can be found in the middle and lower Yellow River; (2) similar periodic patterns
are detected in the 7-day minima (AM7Q) in the upper and middle Yellow River, while different patterns are found in the lower
Yellow River; (3) the increasing coefficients of variance in the primary low-flow conditions suggest that the variability
of the low-flow is increasing from the upper to lower stream; (4) climate change and uneven temporal-spatial patterns of precipitation,
jointly with highly intensified water resource utilization, are recognized as the major factors that led to the decrease of
low-flow in the lower Yellow River in recent decades. The current investigation should be helpful for regional water resources
management in the Yellow River basin, which is characterized by serious water shortage. |
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