RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (01): 120-130.doi: 10.11870/cjlyzyyhj201601015

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IMPACT OF UPPER YANGTZE RIVER LARGE-SCALE CASCADE RESERVOIRS ON FLOW REGIME AT YICHANG STATION

DUAN Wei-xin1,2, GUO Sheng-lian1, Wang Jun2   

  1. 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, 430072, China;
    2. Bureau of Hydrology, Changjiang Water Resources Commission, Wuhan 430010, China
  • Received:2015-04-22 Revised:2015-06-10 Online:2016-01-20

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Abstract: A large number of reservoirs have been built in the upper reach of the Yangtze River in recent years, whose operations would inevitably produce certain effects on natural runoff. The indicators of hydrologic alteration (IHA) method and range of variability approach (RVA), which were based on five essential characteristics, i.e. magnitude, time, frequency, retardation and rates of change, were both applicable to quantitatively analyze the variation of hydrologic regime before and after the dams beconstruction. Based on the larger reservoir group in the upper Yangtze River, the flow series were divided into pre- and post-dam construction by Mann-Kendall (MK) rank correlation method. Then the impact of the upper Yangtze River reservoir operations on hydrologic regime at Yichang station was assessed. The results of M-K test revealed that the annual minimum discharge has been significantly changed since 2000. The IHA and RVA results showed that the hydrologic regime at Yichang station has been moderately changed after the construction and operation of upper Yangtze River cascade reservoir system, in which the Three Gorges Reservoir plays a key role. This study further demonstrates that the changes are mainly reflected on the factors related with the low flow such as mean month discharge between January and March, minimum discharges, frequency and duration of low pulse and so on, and that more significant human-induced hydrological alterations are expected in the future in the Yangtze River.

Key words: reservoirs, flow regime, indicators of hydrologic alteration, range of variability approach, Yangtze River, Yichang station

CLC Number: 

  • P468
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