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Conditions in Brash Ice Covered Channels With Repeated Passages
Luleå tekniska universitet.
1981 (English)In: POAC 81: the sixth international conference on port and ocean engineering under arctic conditions, Québec, Canada July 27-31, 1981, Proceedings, Universite Laval , 1981, 244-252 p.Conference paper (Refereed)
Abstract [en]

Repeated ship passages in an ice covered channel cause an accelerated growth of brash ice distributed in the track and under the solid ice. In order to investigate the growth and the distribution of brash ice, field experiments were made. The harbor ice breaker Valkyria passed with different frequencies in two channels, 200 meters long, during the winter 1978/79 in the harbor of Lulea. Observations were made in drilled holes on lines across the tracks. 42 profiles were observed. An equivalent brash ice thickness, h sub(ekv), is used. h sub(ekv) = 2,5 meters was found in the end of March. The water content was found to increase almost linearly with depth from about 20% at the surface to 100% at the bottom of the brash ice. The brash ice growth is calculated by the degree-day method in modified form, and compared with h sub(ekv). The observed distribution of blocksizes is presented

Place, publisher, year, edition, pages
Universite Laval , 1981. 244-252 p.
Research subject
Water Resources Engineering
URN: urn:nbn:se:ltu:diva-40416ScopusID: 19647207Local ID: f8d91970-2089-11df-be83-000ea68e967bOAI: diva2:1013938
International Conference on Port and Ocean Engineering under Arctic Conditions : 27/07/1981 - 31/07/1981
Godkänd; 1981; 20100223 (andbra)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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