Author(s): Aanund Sigurd Kvambekk
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Abstract: Suldalslagen is one of Norway’s best salmon rivers, famous for the large salmons. Since 1986 the river has been extensively regulated. Today most of the water is directed through a power station and the discharge in the river reduced. A lot of effort has been made to find the amount of water needed to sustain the salmon tribe. The water temperature depend on the discharge and is an important factor for the growth rate of the fish and also the time they leave the river. We have therefore simulated the water temperatures under three possible regulation regimes and even how it would have been without the regulations. A low discharge in winter and spring, reduced from 12 to 6 m3/s, may five-double the number of days with ice production and raise the spring temperatures with 3-4 oC.
Year: 2004