Author(s): Annika Andersson; Lars-Olof Andersson
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Keywords: No Keywords
Abstract: A field experiment to study frazil ice blockage of water intake trash racks in a hydro power plant is described. The experiment, conducted during the winter seasons of 1990/91 and 1991/92, using a submerged video camera, was designed to investigate ice accumulation on trash racks and compare this with laboratory tests. Differences between ice accumulation and adhesion on a steel bar with and without a rubber coating were examined. The submerged video camera, used to observe frazil ice formation at the field site, functioned well. Frazil ice problems occurred in air temperatures as high as -3.9C. Frazil ice accumulation started on the upper section of the trash racks and progressed downwards. Ice was mainly deposited on the upstream face of the racks. The rubber coating material, with its low adhesion to ice, appeared to mitigate frazil ice problems in the intakes.
Year: 1992