Temporal and spatial variation characteristics of base flow and regulation effect of sluice and dam in the upper and middle reaches of the Huai River Basin
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Abstract:
As the most important part of runoff,base flow plays a key role in maintaining the river ecosystem stability.In this study,three digital filtering methods (Chapman Maxwell,Lyne Hollick,and Boughton Chapman) were adopted to divide the baseflow series.The daily observed runoff series were obtained from 2001 to 2015 at seven stations in the Huai River and Shaying tributary.Temporal and spatial variations of base flow were further explored at inter annual and seasonal scales using the Mann Kendall trend analysis method and regional impacts of dam regulations were also identified.Results showed that:(1) the Chapman Maxwell digital filtering method was more reasonable for the division of the baseflow process.The baseflow indices of Shaying River were between 0.23 to 0.46,much less than those of the Huai mainstream which were between 0.36 to 0.50;(2) The inter annual base flows in the entire Huai River Basin decreased gradually,particularly those at the Huaidian and Fuyang stations in Shaying river and Wangjiaba station in Huai river,which showed statistically significant decreasing trend.The baseflow series in the flood season at Baiguishan,Huaidian and Fuyang stations in the Shaying River also showed significant decreasing trend.(3) The regulations of dam and sluice decreased the downstream runoff and baseflow,and the regulation effects in the Shaying River were more serious,especially in the flood season (i.e.,August).The mainstream of the Huaihe River was weakly regulated by the dam,and the reduction was not significant.The study is expected to provide technical support for understanding the characteristics of water cycle and its transformation relationship in the upper and middle reaches of the Huai River Basin,and also provide a basis for sustainable utilization of groundwater resources and impact assessment of human activities.
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