Seite - 234 - in Book of Full Papers - Symposium Hydro Engineering

Fig. 1 Large reservoirs in the upper reaches of theYangtze River August belongs to the main flood season, relatively abundant water.According to the joint scheduling scheme, seven reservoirs from the beginning of August water storage, and water demand is smaller. Assuming that all of them are fully stocked by the end of August, then they will be controlled by the outbound and inbound balances in September and October. Therefore, the impact of these reservoirs on the runoff in September and October is not calculated during the calculation. 2.2. WATER DEMAND IN DOWNSTREAM AREAS DURING THE IMPOUNDMENT PERIOD TGR has huge comprehensive benefits such as flood control, power generation, navigation and water resources utilization. With the development of economy and society and the change of the ecological environment, the water demand in the middle and lower reaches of the Yangtze River has changed greatly compared with the initial design, and the water consumption presents an increasing trend.TGR is located at the last stage of the reservoirs with regulatory capacity in the mainstream of the Yangtze River. The impact of upstream reservoirs on the middle and lower reaches is mainly reflected in TGR. Since TGR was put into operation, some new situations and new problems have emerged in the lower reaches. As for the use of water, higher discharge requirements for reservoirs during the storage period have been put forward. According to the approval requirements of the State flood control department for TGR impoundment program in recent years, the discharge volume of TGR is not less than 10000 m3/s in September and not less than 8000 m3/s in October, To meet the demand of shipping, water supply and ecology . 234