Author(s): Anund Sigurd Kvambekk
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Abstract: The reservoir to the Alta hydropower station is located in a canyon. The reservoir consists of two basins separated with a narrow threshold with depth decreasing from20 m at highest water level (HWL) to 0 m when reaching the lowest water level (LWL) at the upper basin. The hydropower station has two intakes, one 10 m below HWL and another 70 m deeper. The deepest intake has so far been used in the wintertime, but increased winter water temperatures at the outlet of the power station is claimed to have caused problems for fish and have forwarded the need for colder water. During the winter 2000/01 both intakes were used, one at a time and both mixed, to see how this affected the temperature of the discharge water. Four thermistor strings measured the temperature in the reservoir from the surface down to the bottom (maximum 50 m). Current measurements were taken at the threshold. This report deals with the temperature in the reservoir and in the water released from the power plant as a consequence of the intake level.
Year: 2002