Abstract
To solve transferability and spatial-temporal variability problems of ecological flow (EF) criteria existed in traditional Tennant methods, a new modified Tennant method was proposed. Considering the temporal variability and influence of extreme flows on average annual flow, the EF criteria for every month and water year were set as variables, and median monthly flow was taken as the optimum EF ceiling. Considering transferability and spatial variation of ecological objectives in different water function zones, the mean of monthly flow under 95% guaranteed rate and minimum monthly flow was used as the minimum EF. To avoid arbitrary use of EF criteria at all levels, the idea of arithmetic progression was introduced. On achieving satisfactory verification, the new approach was applied in the Hanjiang River as a case study. It is found that this new approach is reasonable with excellent spatial-temporal variability.
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