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THE INTERACTION BETWEEN ICE AND COASTAL STRUCTURES

Two subjects are dealt with. One is piling up of ice on shores and coastal structures. The other is the influence of ice floating in front of the structures on spray caused by wind wave action. Field data were secured from Scandinavia, Canada, and United States. The collected material consists of photos and measurements of extreme ice situations together with drawings of the actual structures. Based upon the field data, following general conclusion may be drawn: 1) Sloping shores and structures favour ice piling. As a result of wind and current forces, ice may pile up to elevations of 10-15 m above still water level. A berm or platform incorporated in the structure caused somewhat less ice piling than a corresponding straight rubble mound, mainly due to the "delay" obtained in filling up the platform with ice. 2) Vertical walls do not favour ice piling. If the depth in front of the structure is sufficient, the ice does not climb, but is rather forced down. When depth in front of the structure including any filling i.e. in the form of a rock mound was above 5 m, no piling up took place in most cases. But with 4 m depth (including a rock mound), piling occurred at one lighthouse (Hals Barre, Denmark). This does not allow the conclusion that 4 to 5 m is a "critical depth". Such depth must depend upon the actual exposure and ice conditions. Cases mentioned in this paper are examples on medium to heavy situations.

  • Supplemental Notes:
    • Abstract of paper delivered at the First International Conference on "Port and Ocean Engineering under Arctic Conditions" held at Trondheim, Norway, August 23-30, 1971
  • Corporate Authors:

    POAC Conference

    ,    
  • Authors:
    • Bruun, P M
    • Johannesson, P
    • Straumsnes, A O
  • Publication Date: 1971

Subject/Index Terms

Filing Info

  • Accession Number: 00025707
  • Record Type: Publication
  • Source Agency: Arctic Institute of North America
  • Files: TRIS
  • Created Date: Mar 28 1972 12:00AM