Observations of ships in compressive ice

Sea ice field compression can be observed in different scales. The scale of developed ice dynamic models is up from 1000 m. These models describe the compression in certain sea ice area and the models theory is based on continuum physics. But when it comes to ship scale, smaller than 1000 m, the compression is considered to be very local. Even in the length of ship hull, the compression can vary significantly. Sea ice compression has a clear and often visible effect; it can cause severe damage on ships. When the ice compression is high against the ship hull, there is an added resistance. It is possible to estimate this resistance due to compression from large scale average values, but when the scale is smaller, the load appears to be more local and the resistance values will vary greatly. Within the SAFEWIN project, observations of ships in compressive ice in the Baltic Sea were collected in winter 2010. The data was selected based on Compression survey form distributed to Finnish fleets, Tallink and IB Tarmo, on the IBNet reports from the Finnish and Swedish icebreakers and on the Waiting Time list, which was received from Finnish Transport Agency. The automatic identification system (AIS) data was used to get the routes of the selected ships. AIS data was also used to select ships which were not assisted by icebreakers. These ships served as parallel data. Comparing the ships from Automatic Identification System data and Compression survey and IBNet/Waiting Time data gave an estimation of severe compression areas. The ship observations were then compared with the results of the reanalysis of multicategory ice dynamic model. The model output was the magnitude of the compression, ice thickness and course of the ice drift and compression.

• Record URL:
  http://www.poac.com/Papers/POAC11_80-192.zip
• Summary URL:
  http://www.poac.com/PapersOnline.html
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03766756
• Supplemental Notes:
  • Abstract reprinted with permission of the International Conference on Port and Ocean Engineering Under Arctic Conditions (POAC).
• Corporate Authors:

  Port and Ocean Engineering under Arctic Conditions (POAC)

  ,    
• Authors:
  • Leisti, Hanna
  • Kaups, Kristjan
  • Lehtiranta, Jonni
  • Lindfors, Mikael
  • Suominen, Mikko
  • Lensu, Mikko
  • Haapala, Jari
  • Riska, Kaj
  • Kouts, Tarmo
• Conference:
  • 21st International Conference on Port and Ocean Engineering under Arctic Conditions (POAC'11)
  • Location: Montréal , Canada
  • Date: 2011-7-10 to 2011-7-14
• Publication Date: 2011

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Maps; References; Tables;
• Pagination: 13p
• Monograph Title: POAC '11: Proceedings of the 21st International Conference on Port and Ocean Engineering under Arctic Conditions
• Serial:
  • Proceedings of the International Conference on Port and Ocean Engineering Under Arctic Conditions
  • Publisher: Port and Ocean Engineering under Arctic Conditions (POAC)
  • ISSN: 0376-6756
  • EISSN: 2077-7841
  • Serial URL: http://www.poac.com/PapersOnline.html

Subject/Index Terms

• TRT Terms: Compression; Data collection; Dynamic models; Icebreakers; Sea ice; Ships
• Uncontrolled Terms: Automatic identification systems
• Geographic Terms: Baltic Sea
• Subject Areas: Environment; Marine Transportation; Planning and Forecasting; Vehicles and Equipment; I15: Environment; I72: Traffic and Transport Planning; I90: Vehicles;

Filing Info

• Accession Number: 01555111
• Record Type: Publication
• Report/Paper Numbers: POAC11-139
• Files: TRIS
• Created Date: Feb 26 2015 10:03AM