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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Geometry influence and discharge rating curve correction in morning glory spillways
Geometry influence and discharge rating curve correction in morning glory spillways
Author : FAIS, LAURA M.C.F,(1), DALFR¨¦ FILHO, JOS¨¦ G.(2) & GENOVEZ, A.I.B(3)
Spillways are structures that control the water level in a reservoir, ensuring the dam safety. Since the main cause of dam failures is
related to poor discharge flooding design, the adequate determination of the discharge rating curve of the spillway is an essential
parameter. Depending on the characteristics of the dam section, a morning glory spillway is an alternative to the conventional ones, as
it is placed inside the reservoir. It consists of a conventional crest followed by a vertical shaft, then, a circular bend ending up into a
tunnel. Each one of these components has its own design criterion. The use of physical modelling and the advances of computational
modelling make the design of the structure accurate. This paper has the objective of analyze the discharge rating curve of the morning
glory spillway, using a novel parabolic type bend and compare it with a 90o circular bend and a polycentric bend with variable radius.
The authors carried out an experimental study in 1:51,02 scale, using the spillway model of Paraitinga Hydropower, Brazil, in the
Laboratory of Fluid Mechanics and Hydraulics, School of Civil Engineering, Architecture and Urbanism, University of Campinas,
Brazil. The new bend geometry presented an increase in the discharge rating curve, indicating that this geometry should be
considered for the design of morning glory spillways..
File Size : 536,995 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 13/08/2015
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