关键词: 生态流量, 生态水文学法, 最小生态流量, 适宜生态流量, 平均流量, 湘江

Abstract: River ecological flow is the most important condition of the benign cycle of the ecological environment. This paper selects the Xiangjiang River (Xiangtan section) as the control section, the method of annual distribution of lowest ecological flow and IHA-RVA method are used to calculate the river lowest and optimal ecological flows and the rationality of the calculation results are verified by Tennant method. The calculation results show that the lowest ecological flow is 639.6 m3/s, accounting for 32.2% of the annual average natural flow. The optimal ecological flow is 983.4 m3/s, accounting for 49.5% of the annual average natural flow. The calculation results can meet the river ecological protection targets, and are consistent with the wet-dry changes of natural rivers during the year. This research can provide a scientific basis for the rational management of water resources and the ecosystem restoration in Xiangtan area of the Xiangjiang River.

Key words: ecological flow, eco-hydrological method, minimum ecological flow, suitable ecological flow, average flow, Xiangjiang River