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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Simulation of hydropeaking flows in downstream reservoir of hydropower
Simulation of hydropeaking flows in downstream reservoir of hydropower
In regulated rivers, hydropeaking is a common phenomenon caused by the rapid increase or decrease in the release of
water from upstream reservoir hydropower stations when there is a great fluctuation in the demand for power. For a
hydropower plants cascade, the flow in the downstream reservoir is significantly affected by upstream hydropeakings. In
the present paper, we discuss associated problems and counteraction related with downstream boundary conditions
when trying to simulate such artificial flows with a one-dimensional hydraulic model.
Usually, the downstream boundary condition may be flows, stages or a rating curve. But none of them can be easily and
correctly used in the simulation of hydropeaking flows in a reservoir: the flow at the downstream boundary is not easily
available; stage errors at downstream boundary may be propagated throughout most of the domain due to a pretty small
hydraulic gradient in reservoirs; a rating curve measured under natural conditions is not suitable for such artificial flow. A
modified rating curve is proposed for solving the problems, by assuming a virtual broad crest existed at the downstream
boundary. This method is used in the simulation of a hydropeaking flow in the Three Gorges Reservoir resulted from the
planning upstream hydropower station. The computed results are compared and discussed with the ones obtained by
using a constant water stage at the downstream boundary.
File Size : 900,420 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 18/08/2015
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