Environmental flow of the typical sections in upper and middle Huai River Basin based on REF
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Abstract:
Based on monthly runoff data (1956-2000) and typical fish survey data of 11 sections in 11 rivers on middle and upper reaches of the Huai River, four schemes of calculating minimum and appropriate environmental flow were established by velocity methods ( minimum, average and maximum options), minimum monthly runoff method and month-by-month frequency method. First, the Criterions of REF (ratio of environmental flow to stream flow) aimed at different characteristic hydrological years (wet, normal, dry and extraordinary dry) and hydrological seasons (dry and wet) were put forward on the basis of Tenant method. Then appropriate environmental flow schemes in different hydrological years and seasons were determined by comparing the conformance of velocity methods to the criterions of REF. The results showed that the rank of minimum and appropriate REFs was Wo River, Shaying River, Mainstream of Huai River, Pi River and Hongru River. The level of meeting the REF ranked in the order of Hongru River, Mainstream of Huai River, Pi River, Shaying River and Wo River. The lack of meeting the ecological water demand in Wo and Shaying rivers implied that the proportion of ecological water demand should be improved.
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