frozen ground or permafrost

passive two-phase thermal pile

a foundation pile provided with a two-phase natural convection cooling system to remove heat from the ground.

passive single-phase thermal pile

a foundation pile provided with a single-phase natural convection cooling system to remove heat from the ground.

passive construction methods in permafrost

special design and construction methods used for engineering works in permafrost areas where preservation of the frozen condition is feasible.

partially-bonded permafrost

ice-bearing permafrost in which some of the soil particles are not held together by ice.

palsa bog

a poorly-drained lowland underlain by organic-rich sediments, which contains perennially frozen peat bodies (peat plateaux) and, occasionally, palsas.

palsa

a peaty permafrost mound possessing a core of alternating layers of segregated ice and peat or mineral soil material.

oriented lake

one of a group of lakes possessing a common, preferred, long-axis orientation.

organic cryosol

an organic soil having a surface layer containing more than 17% organic carbon by weight, with permafrost within 1 meter (3.3 feet) below the surface.

orbiculic cryogenic fabric

a distinct soil micromorphology, resulting from the effects of freezing and thawing processes, in which coarser soil particles form circular to ellipsoidal patterns.

open-system pingo

a pingo formed by doming of frozen ground; caused by groundwater that moves downslope through taliks and onto the pingo surface, where it freezes.

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