Page - 239 - in Book of Full Papers - Symposium Hydro Engineering

This paper has been checked by our corporation and is allowed to be published in the conference. REFERENCES [1] Yangtze Water Resources Committee (1992), Preliminary Design Report of TGP . [2] Zhou Man & Xu Tao(2014). Hydropower Generation Journal: Analysis of Multi-goal Optimized Operation of TGP and Its Comprehensive Benefits, Volume 33, Issue 3, 55-60. [3] Xu Jijun(2013). Research on Essential Technical Issues of Joint Operation of Large-scale Hydropower Station Cluster on the upstream Catchment of the Yangtze River, China Three Gorges, Volume 9, Issue 3,51-56. SUMMARY A large number of reservoirs with large storage capacity have been constructed in Upper reaches of Yangtze River. These reservoirs impound from August to October annually, and store large amounts of water. Thus the Inflow of Three Gorges Reservoir decrease in September and October. In this paper, we analyzed the runoff characteristics of upstream of Yangtze River and the runoff sources of Yichang hydrological station. Then we selected 2017 level year and prospective level year, simulated the runoff of the hydrological station in the upper Yangtze river, and analyzed impact of Upper Yangtze cascade reservoirs operation on Three Gorges Reservoir in impoundment period. The results show that the runoff of tributary and Yichang hydrological station decrease significantly, especially in dry years. Meanwhile, with the increase of the number of upstream reservoirs, the impact increases gradually. We calculated the proportion of the water storage of upper Yangtze cascade reservoirs in impoundment period of Three Gorges Reservoir. The results can be used to optimize the measures of reservoir operation, such as the use of the flood resources at end of flood period and the initial control water level of impoundment. KEY WORDS RESERVOIR OPERATION;RESERVOIR CAPACITY;FLOOD STORAGE;THREE GORGES RESERVOIR 239