关键词: 水文情势; 枯水期; 控制性水库; 水库调度; 鄱阳湖; 鄱阳湖五河水系;

Abstract: In recent years, the Poyang Lake suffered more decreased water lever and earlier and longer dry period in dry season, which has seriously affected the economic and social development, ecosystem and biodiversity of the lake area.In order to clarify the influence of reservoirs storage and operation on hydrological regime in the Poyang Lake Basin, we studied seven controlled reservoirs with better operation performance in its five tributaries(Ganjiang River, Fuhe River, Xinjiang River, Raohe River, Xiushui River).Impacts of reservoirs operation on the flow and water level of the downstream channel and the Poyang Lake area were quantitatively analyzed by long series runoff regulation calculation method.The results showed that September to February was water supply period of those reservoirs, during this period the seven controlled reservoirs supplied water to the Poyang Lake.Under the current scheduling mode, the monthly flow into the lake increased by 62～289 m3/s due to reservoir regulation.The Zhelin Reservoir on the Xiushui River had a great effect on uplifting water level at the downstream Qiujin Station during dry season, while reservoirs on the Ganjiang River, Fuhe River and the Changjiang River had little effect.The controlled reservoirs in five tributaries raised the water level of the lake by 0.04～0.48 m, which had no relation with the current lower water level and drying time advancing in the Poyang Lake area during the dry period.

Key words: hydrological regime; dry season; controlled reservoirs; reservoir operation; Poyang Lake; five tributaries of the Poyang Lake;