permafrost

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Related to Discontinuous permafrost: Sporadic permafrost

permafrost

permanently frozen ground on which only a thin layer thaws in the summer, as in the high Arctic and Antarctic.
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The RTF is in a zone of discontinuous permafrost, the surrounding area is an open field that has been cleared of native vegetation for more than 60 years and consists of mostly moist silt (Shannon & Wilson, Inc.
Some studies indicate that continuous permafrost and discontinuous permafrost respond differently to climate warming (Nelson et al.
The other half is in in permafrost areas and troublesome discontinuous permafrost soils.
There are several types of permafrost: continuous permafrost, where the average yearly temperature is below 23[degrees]F (-5[degrees]C), discontinuous permafrost, where it is between 23[degrees]F and 28[degrees]F (-5[degrees]C and -2[degrees]C), and sporadic permafrost, if it is always above 28[degrees]F (-2[degrees]C).
Much of this summer's field work and office analysis is aimed at better identifying soil conditions, terrain, hillsides, vegetation, geology, safety, and environmental concerns as Alaska LNG continues to make decisions not only on waterbody crossings but also pipeline specifications to match different ground conditions such as discontinuous permafrost that would put additional stress on sections of pipe.
A qualitative introductory chapter describes the setting for the world's cold regions where continuous and discontinuous permafrost prevails.
In dangerous, discontinuous permafrost soils where water can freely move, freezing could cause serious heave and lift the pipe above the surrounding terrain.
The result is that fens have warmer ground temperatures than peat plateaus and are the type of peatland most likely to be permafrost-free in the discontinuous permafrost zone.
What we've proposed is a large-diameter, high-pressure gas pipeline that will be buried for almost its entire length, and chilled to below freezing in areas of permafrost or discontinuous permafrost to keep the soil frozen," explained Dave MacDowell, Denali spokesman.
Difficult ground conditions including both continuous and discontinuous permafrost, as well as seismic issues, can make it difficult to distribute the pipeline load safely.

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