Ice jam initiation by a simple partial surface obstruction in a channel was studied experimentally in a channel was studied experimentally in laboratory flumes using polyethylene, paraffin, as well as real ice parallelepipeds, as model ice floes. The important dependent parameter under study was the critical surface concentration of floes at the gap in the surface obstruction at which floes would form a stable arch across the gap and an ice jam would be initiated. This critical floe concentration C sub g* was found to be independent of the ration of gap width to flume width and to be a descreasing power function of the ratio of floe size to gap width. In addition C sub g* was found to be independent of the approach flow Froude number for flow velocity less than the critical submergence velocity of an ice floe, for artificial model floes, but to increase with increasing Froude number when real ice floes were used. This difference and other quantitatively different results depending on whether natural ice blocks or plastic blocks were used as model ice floes were tentatively attributed to differences in floe material characteristics mainly interparticle friction force and surface tension property, the latter affecting significantly the critical submergence velocity of thin plastic blocks as compared to that of natural ice floes of the same size and density. /Author/

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    National Research Council of Canada

    1200 Montreal Road
    Ottawa, Ontario  Canada  K1A 0R6
  • Authors:
    • Tatinclaux, J C
    • Lee, C L
  • Publication Date: 1978-6

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  • Accession Number: 00185378
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 3 1979 12:00AM