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заг. вечная мерзлота ; вечномёрзлый грунт (a thick subsurface layer of soil that remains below freezing point throughout the year. COED. permafrost, permanently frozen soil, subsoil, or other deposit, characteristic of arctic and some subarctic regions; similar conditions are also found at very high altitudes in mountain ranges. In 1962 measurements in a borehole drilled on Melville Island, Northwest Territories, Canada, showed that the ground was frozen to a depth of at least 1,475 ft (450 m); comparable thicknesses have been found in other far north regions. Tundras, though underlaid by permafrost, today support centers of population in Alaska, Canada, and Siberia. Permafrost is a very fragile system that may easily be damaged or destroyed by the presence of man-made heat. A controversy developed in the late 1960s and early 70s over the construction of an oil pipeline from the Alaska North Slope to the southern part of the state. Critics of the project argued that if the pipeline containing hot oil ever came into contact with the permafrost, it would melt the permafrost; the pipeline would then sink and eventually break. The oil spilled during the breakage would result in a major ecological disaster. It was decided to build the pipeline with insulated pipe raised above the permafrost or on gravel beds in order to prevent melting and thus preserve both the pipeline and the ecosystem. The Columbia Electronic Encyclopedia® Copyright © 2013 Alexander Demidov буд. многолетняя криолитозона ; вечномёрзлый грунт бур. многолетнемёрзлая порода військ., тех. вечномёрзлые породы геолог. мёрзлые отложения (MichaelBurov ; мёрзлая толща (MichaelBurov екол. многолетнемёрзлые породы зол.доб. вечная (многолетняя мерзлота Leonid Dzhepko Макаров вечная мерзлота (состояние почвы) ; многолетнемёрзлые породы (явление длительного охлаждения горных пород до нулевой температуры и сами горные породы, оцементированные замёрзшей в них влагой, называемые многолетнемёрзлыми породами) нафт. многолетнемёрзлая горная порода нафт.газ.тех. вечномёрзлая порода нафтопром. многолетнемёрзлые горные породы океан. вечная мерзлота (почвы) прир.рес. мерзлотная почва ; многолетно мёрзлый материал ; постоянно мёрзлый грунт ; почва с вечно мёрзлым слоем тех. многолетняя мерзлота ; многолетнемёрзлый грунт нафт.газ ММГ (многолетний мерзлый грунт OGC геолог. вечномерзлотный (MichaelBurov ; многолетнемёрзлый (MichaelBurov ; геокриологический (MichaelBurov ; вечномёрзлый (palomnik Англійський тезаурус абрев. permanently frozen ground абрев., землезн. permanently frost
