Author(s): S. M. Gardarsson; G. G. Tomasson; F. G. Sigtryggsdottir; P. R. Palmason; B. Stefansson
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Keywords: No Keywords
Abstract: Halslon reservoir, the main reservoir for the Karahnjukar Hydroelectric Project in eastern Iceland, is formed by three dams, including the Karahnjukar dam, Europe′s highest concrete face rockfill dam with a maximum height of 198 m. The spillway for the Halslon reservoir is a side canal overflowing weir followed by a chute which terminates at a canyon edge where a jet falls some 100 m into a narrow gorge downstream of the Karahnjukar dam. The paper discusses the prevailing geological conditions, the main technical challenges of energy dissipation, and the design solutions applied to ensure safe operation of the spillway system. This includes laboratory model testing, aeration, geometry of the chute, baffles, oblique termination of the chute, plunge pool and a tailwater dam. The experience of the first two spilling periods in the fall2007 and 2008 is discussed and the performance of the spillway is evaluated.
Year: 2009