Page - 247 - in Book of Full Papers - Symposium Hydro Engineering

The cities in the middle and lower reaches of the Yangtze River bear the backbone power of the national economic development. As the key project in the Yangtze River Basin, the emergency assistance of the TGP reservoir plays a crucial role in the city’s normal development and the handling of the events. Due to the wide range of the middle and lower reaches of the Yangtze River and the rapid development of the cities along the basin, there are more and more emergencies and hidden dangers, posing higher requirements in the reservoir’ emergency dispatching. 5. RESEARCH ON THE COUNTERMEASURES In view of the influence of climate change on the dispatching of the TGP reservoir, the countermeasures are put forward from the technical and management aspects. Due to the runoff changed in the new climate environment, it is necessary to research on the optimal dispatching mode technically to match with the new runoff conditions. On the other hand, the frequent occurrence of extreme events raises requirements for the emergency response capacity. It is urgent to establish a complete emergency management system and strengthen the reservoir’s emergency management ability. 5.1. OPTIMAL SCHEDULING METHOD BASED ON HYDROLOGICAL FORECAST The change of climate has an adverse effects on the reservoir inflow, which is mainly manifested in inflow decreased in flood season and storage period. Precise flood forecast is an important prerequisite for reservoir operation. Therefore, this paper optimizes the operation mode of the TGP Reservoir during these periods, to ensure the comprehensive benefits such as flood control, shipping, power generation, water supply and ecological environment protection etc.. (1)Utilization of flood resources in flood season According to the trend that the runoff decreased in flood season and the improved hydrological forecast technology, the TGP reservoir changes the flood control method, and tries to take full use of flood resources rather than defensing flood singly. Through the proactively management of flood, realizing the flood resource utilization under the risk controllable. It regulates small-mid-flood by using the limited storage capacity, combines with the short-mid-term hydrological forecast, and give full play to the benefits of the water head with level elevation. In addition, according to the runoff forecasting in late flood season, the reservoir balances flood control and water storage with the method that it intercepts the flood in late flood season to pre-storage with predicted abandoned water, and creates favorable conditions for the water storage after the flood season. Since the mid-July in 2017, it sustained high temperatures and little rain. According to the inflow forecast, the TGP reservoir reduced the discharge by 3000 m3/s and raised the water level by small and medium flood. It orderly takes the benefit of water head to guarantee the demand of big peak shaving in dry summer. (2)Optimization of water storage in late flood season 247