His reports are the basis for much of the work that followed. Gold's work is based largely on empirical data of what did or did not fall through and the ice conditions involved. Use of Ice Covers for Transportation by L.Many papers have been written on various aspects of this problem. There has been a lot of work done toward making ice roads safer.
Ice roads are the best way to haul loads in parts of Canada. Their website is well worth a visit.Ĭopyright 2012 Minnesota Department of Natural Resources. Their work has been widely adopted by other states and towns across the ice belt.
Tim Smalley, their recently retired water safety specialist, and his team have done and continue to do a particularly good job of coming up with practical advice on recreational ice use. This is described on the Ice Hazards section.ĭetail: The origin of the Minnesota DNR recommendations is not clear, however, whoever developed them did so in a logical fashion. Holes of various types are sometimes common. Pressure ridges and especially folded ridges are plentiful, essentially on larger lakes. There are also all sorts of weak points that can be found on ice. In the previous 7 years there were, on average, less than one accident per season from these regions. With the rapid warming of the arctic and sub-arctic there were 18 fatalities in Alaska and Northern Canada in the 2019 ice season. In particular, ice can weaken quickly in thaw conditions. NOTE: Ice thickness is just one factor in the strength of an ice sheet. Some of the recommended formulas for heavy loads on properly maintained ice roads are significantly less conservative than the MN DNR numbers and are not suitable for recreational activities. Summary: This article looks at the time tested Minnesota DNR recommendations for ice thickness for different recreational activities and compares them with three papers on the subject. The Bearing Strength of Ice for Recreational Activities
0 kommentar(er)
