International Journal of Environmental Science and Development

Abstract—The Mann-Kendall test was applied to analyzing the shift points and defining the hydrologic series of the river stream flow from 1963 to 2011. The Tennant method was subsequently used to evaluate the ecological flow and the monthly guaranteed frequency method was applied to calculating the monthly ecological water requirements in two different hydrologic series. The results were as follows. 1) The years during 1963 - 1985 and the years during 1986 - 2011 were distinguished as two hydrologic series. 2) The ecological flow was generally in better condition in other season than that in spawning season. During the spawning season, 87.0% of stream flow was not at the appropriate level before 1985 and 72.4% after 1986, which indicated a worse condition for the reproduction and breeding of aquatic organisms. 3) The monthly ecological water requirement varied and showed a decreased trend, consistent with the stream flow regime. This research helps to deepen understanding of the evaluation of the ecological flow and to provide a basis for decision making and reservoir regulations with hydrological alterations.

Index Terms—Hydrologic alterations, ecological flow, Mann-Kendall test, tennant method, monthly guaranteed frequency method.

Guangling Hao, Xuan Wang, and Guannan Cui are with the School of Environment, Beijing Normal University, Beijing 100875, China (e-mail: HGL370@163.com, wangx@bnu.edu.cn, dandancuicui@gmail.com).
Peiyu Liang was in Beijing Normal University. He is now with the Zhejiang Institute of Hydraulics and Estuary, Hangzhou 310020, China (e-mail: 758856495@qq.com).

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Cite: Guangling Hao, Xuan Wang, Peiyu Liang, and Guannan Cui, "Evaluation of the Ecological Flow Considering Hydrological Alterations in the Baihe River, Northern China," International Journal of Environmental Science and Development vol. 7, no. 8, pp. 601-604, 2016.