Properties of Level Landfast Ice and Hummocked Ice near Nain, Labrador

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TypeTechnical Report
AbstractThis report discusses property measurements that were made on level first-year sea ice near Nain, from early February to mid May 2004. Ice thickness ranged from 0.41 to 0.65 m in February, and 0.89 to 1.20 m in mid-May. The highest borehole strengths were measured in March, when the ice was coldest. Results showed that, in general, ice strength decreased more rapidly towards the top and bottom surfaces than in the ice interior. The strength reduction was due to ice decay, clear evidence of which was provided by the deteriorated state of the extracted cores, and changes in the temperature and salinity of the ice. Measurements are also given for hummocked ice sites that were sampled in a quasi-stable area of landfast ice, in April. The ice surface relief increased, as did the ice and snow thickness, as the hummock field was penetrated. Ice thickness at the first site ranged from 0.99 to 1.17 m, whereas ice at the fourth site ranged from 1.14 to 2.20 m thick. The hummocked ice was isothermal at near melting temperatures throughout its full thickness. The ice salinity was minimal in the top ice, ranged from 4 to 5� in the ice interior, and was upwards of 8� towards the bottom ice. The highest borehole strength was measured in the interior of the ice. On average, the hummocked was thicker and stronger than the level landfast ice (for the same time of year).
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AffiliationNational Research Council Canada; NRC Canadian Hydraulics Centre
Peer reviewedNo
NRC numberCHC-TR-031, TP14387E
NPARC number12328541
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Record identifier21e6c808-aa99-484d-82c1-7a5592aad5a1
Record created2009-09-10
Record modified2016-10-03
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