Author(s): S. Roen; E. Tesaker

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Keywords: No Keywords

Abstract: Ice formation near intake constructions at hydro power plants creates various problems, particularly in rivers of larger gradients. The main cause is large amounts of ice formed upstream of the intake and/or inflow of supercooled water which freezes on the trash racks. Ice problems are described for four different Norwegian power plants on inland rivers. Possible solutions are discussed, the most important being: reduction of water discharge (and reduced power production), an arrangement of floating devices (booms) to reduce inflow of ice, increased distance between bars in the trash racks, and a system of floating devices to reduce the whirling of supercooled water, to prevent it from reaching the trash racks. When new power installations are planned, it is important that potential ice problems are discussed, and constructions made to avoid or reduce expected difficulties. One should attempt to: locate the intake so that cold surface water cannot be wind-blown towards the trash racks, arrange for a high water level at the racks, keep a maximum, but physically acceptable distance between bars in the racks, build in heaters in the bars, consider carefully the shape and material of the bars.

DOI:

Year: 1988