Research On Theory And Methods For Calculating Cascade Reservoirs Design Flood

Aiming at the deficiency of the existing design flood calculating stand in China, the process and methods of determining the design flood for cascade reservoirs are discussed. The methods presented in this paper are showed to have good inference for determining the cascade reservoirs' design flood by the given case study. The main contend are as follows:(1)Summing up the process of calculating properly the design flood for cascade reservoirs, this paper analyze the characteristics and developing trend of design flood in our country and other countries. It is pointed out the deficiency about the calculating of design flood for cascade reservoirs in China based on comparison, thereby a helpful inference is provided for enriching the methods of determining the cascade reservoirs' design flood.(2)From two aspects, i.e., the design site located at downstream of two regulating reservoirs and the design site located in the middle of two joined operational cascade reservoirs, the methods of design flood spatial pattern of cascade reservoirs at the design site are studied. Incorporating the upstream cascade reservoirs in the Yellow River, the paper calculated the Jishixia hydroelectric power station's design flood whichis affected by the upstream regulated reservoirs.(3)The discreted probabilistic composite method using to calculate the cascade reservoirs' design flood is studied, and the applicability is discussed.(4)The probabilistic design conception on limit state was introduced, and the theory using the JC method to compute the cascade reservoir's design flood was studied.(5)Aiming at the construction design flood of planned projects at the downstream of cascade reservoirs, a optimum design method which decreased the construction diversion discharge of the downstream cascade reservoirs through regulating the upstream constructed reservoirs' flood is proposed.