frozen ground or permafrost

drunken forest

trees leaning in random directions caused by melting permafrost.

disequilibrium permafrost

permafrost that is not in thermal equilibrium with the existing mean annual surface or sea-bottom temperature and the geothermal heat flux.

discontinuous permafrost zone

the major subdivision of a permafrost region in which permafrost occurs in some areas beneath the exposed land surface, whereas other areas are free of permafrost.

discontinuous permafrost

permafrost occurring in some areas beneath the exposed land surface throughout a geographic region where other areas are free of permafrost.

dilation crack ice

ice that forms in dilation cracks.

dilation crack

a tensile fracture in a frozen material due to surface extension caused by doming.

dielectric constant

measure of the ability of the soil to store electrical energy in the presence of an electrostatic field.

detachment failure

a slope failure in which the thawed or thawing portion of the active layer detaches from the underlying frozen material.

design thawing index

the cumulative number of degree-days above 0 degrees Celsius, calculated by taking the average of the seasonal thawing indices for the three warmest summers in the most recent 30 years of record.

design freezing index

the cumulative number of degree-days below 0 degrees Celsius, calculated by taking the average of the seasonal freezing indices for the three coldest winters in the most recent 30 years of record.

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