PREDICTION OF VESSEL ICING - A 1989 UPDATE

The National Oceanic and Atmospheric Administration (NOAA) vessel icing algorithm is evaluated against theoretical advances. The most difficult factor is influence of sea temperature. Modelling demonstrates the importance of supercooling of spray during its trajectory to extreme ice accretion. This occurs when sea temperatures are less than 2-3 degrees C above the saltwater freezing point. The sea surface temperature term in the NOAA algorithm is consistent with the supercooling hypothesis and a further category of "extreme" icing is added, which can explain anecdotal cases greater than 5 cm per hour. A wave height/wind speed threshold is 5m for a 15m vessel, 10m for a 50m trawler and 15m for a 100m vessel, developed from seakeeping theory. These wind speeds are exceeded 83%, 47% and 15% during February in the Bering Sea.

• Supplemental Notes:
  • POAC 89, 10th Intl Conference, Port and Ocean Engineering under Arctic Conditions, 12-16 June 1989, Luleaa, Sweden, Proc, v 2, p 712 [10 p, 21 ref, 2 tab, 6 fig]
• Authors:
  • Overland, J E
  • Pease, C H
• Publication Date: 1989

Language

• English

Subject/Index Terms

• TRT Terms: Algorithms; Forecasting; Ice; Icing; Meteorology
• Subject Areas: Geotechnology; Marine Transportation;

Filing Info

• Accession Number: 00700007
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM