Comparison of Local Ice Pressures on the CCGS Terry Fox with other Data

摘要

Local pressure data from bergy bit impacts with the CCGS Terry Fox off the north east coast of Newfoundland in June 2001 have been compared with other data. These data sources include the USCGC Polar Sea from operations in the Beaufort Sea and Chukchi Sea, and bergy bit impacts at Grappling Island. They have been put on a common basis and compared with the CCGS Terry Fox data. When factors relating to area, exposure and probability of exceedance are taken into account, the difference between the three groups of local pressure data becomes smaller. At the 10"3 probability of exceedance and a single sub-panel of area about 0.3 m2, the local pressure varied from 5 MPa (CCGS Terry Fox), in the range 4.2 MPa to 2.7 MPa (USCGC Polar Sea), to 1.7 MPa (Grappling Island). Smaller ice mass and lower impact velocities explain the lower pressures for Grappling Island data.