Author(s): Xu Guang Li; Ben De Wang; Shi Guo Xu
Linked Author(s): Shiguo Xu
Keywords: Mountain reservoir; Flood routing; Two-stage model
Abstract: A two-stage model is presented to rout a flood through spillways of a mountain reservoir. Based on an introduction of a physical concept: transmitting rate T [m3/s] of dynamic volume into static volume, the diffusion from the inflow at upstream end to T can be estimated through Muskingum formulation since the impact from the water level before the dam on dynamic volume is far less than from the inflow rate, and the process from T to reservoir outflow may be approximated into a surge wave through a plain reservoir. The Runge-KuttaFehlberg numeric programme is recommended to solve the above model, and a sub-section inverse function countermeasure is exploited to dispose the case of a discontinuous outflow hydrograph derived from multi-prevention standards and multi discharge equipments of a reservoir. The two-stage model is tested with Dahuofang reservoir in Hunhe River basin of Northeast China and compared with an operative method of dynamic volume curves. The results demonstrate the two models is close in accuracy, however, the proposed model is much superior in computing speed, storage and operability performances, especially significant in real-time management for a group of reservoirs, moreover, it can deal with severest floods, which is rather unique, the reason why is that the promising model rationally abstracts a set of tedious dynamic volume curves into Muskingum method of three parameters.
Year: 2007