| Cite this article: | 孟春芳,宋孝玉,田珂宁,等.卫河水系新乡段环境流量最小值研究[J].灌溉排水学报,0,():-. |
| mengchunfang,SONG Xiaoyu,TIAN Kening,et al.卫河水系新乡段环境流量最小值研究[J].灌溉排水学报,0,():-. |
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| The minimum environmental flow of the Xinxiang Section of the Wei River |
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mengchunfang1, SONG Xiaoyu2, TIAN Kening3, LIU Xueyong4, Wang Yu4, GUO Shuxian4, Ye Bingxiao4
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1.henanshengxinxiangshuiwenshuiziyuankanceju;2.State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi’an University of Technology;3.Henan Vocational College ofWater Conservancy and Environment;4.Xinxiang Hydrology and Water Resources Survey Bureau
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| Abstract: |
| Abstract: 【Objective】The objective is study the minimum environmental flow (e-flow) of the Xinxiang Section of the Wei River (XSWR), which is beneficial to the planning and protection of river ecosystem.【Method】The minimum e-flow of the XSWR included three parts: water demand for ecological system, water self-purification and sediment transport. Firstly, the Tennant method was used to calculate the ecological water demand, and a one-dimensional water quality model was used to calculate the water self-purification demand. The sediment transport water demand was calculated according to the amount of water required by transporting unit sediment in the flood season. With computing, the Tennant method was based on natural flow regimes (1963-1982) before runoff mutation. The cluster analysis (CA) and discriminant analysis (DA) were used to identify water quality indicators responsible for spatial variation in water pollution due to the obvious spatial variation of water pollution characteristics. To verify the rationality of the recommended e-flow values, the independent values calculated by the range of variability approach (RVA) were then compared with the recommended e-flow values. Finally, the recommended e-flow values were compared with the average annual flows natural flow (1963-1982) to analyze the surplus and deficiency of the recommended e-flow, and the e-flow guarantee rate was evaluated in monthly units.【Result】 The results showed that there was great difference in the ecological water demand of 7 hydrometric stations along the river. Under the standard situation of sewage discharge, the water self-purification demands of Xiuwu and Hehewei Stations were 0.74 m3/s and 5.98 m3/s, respectively. The sediment transport water demand of each station basically reached the maximum value in August, and there was great difference in the sediment transport water demand of 7 hydrometric stations along the river. The analysis of the surplus and deficit of e-flow showed that Hehewei, and Jixian, and Liuzhuang Stations were markedly short of water. The guarantee rate of environmental flow is as follows: the guarantee rates of 7 hydrometric stations in flood season were obviously lower than that in non-flood season. Qimen station had the highest guarantee rate, and Hehewei station had the lowest guarantee rate.【Conclusion】 This paper studies the minimum e-flow of the XSWR, which can provide a reference for the management of e-flow, and contribute to the ecological protection of the river and the efficient utilization of water resources. |
| Key words: environmental flow; Wei River; Xinxiang; Tennant method; one-dimensional water quality model |
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