Dalton Highway Trans Alaska Pipeline.

Acceleration, and age-old frozen debris lobes

Less than one mile upslope from Alaska’s Dalton Highway, there are 23 frozen debris lobes looming. Frozen debris lobes (FDLs) are something like a cross between a landslide and a glacier. They’re silty sand and gravel, stones, icy frozen soil as well as liquid water kept from freezing by the intense pressure of the slow-motion push downhill. […]