洪水过程线为五边形的调洪解析计算

中小型水库调洪计算,如果设计洪水过程线为概化五边形模型,则防洪库容和相应的最大下泄流量可通过解析计算求得.推导中先假设洪水来临前库中水位为溢洪堰顶齐平并无闸门控制,为自由溢流,泄流过程线近似为直线.将洪水过程分为三个区,用解析方法建立各区的计算公式.

Analytic Computation of Flood Regulation for Flood Hydrograph of Pentagon

In the flood regulating computation of medium-minor reservoir;if the design flood hydrograph is the model of simplified pentagon,the flood control storage and corresponding maximum discharge flow can be obtained by analytic calculation.In the derivation,the first assumption that the reservoir stage is the same height as the spillway crest level,before flood is coming and weir is unc- ontrolled free overflow and the release diagram of stored water approximates the straight line are made.Then divide the flood hyarograph into three region. Finally the formulas of the each area are established by the analysis method.