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Sunday, August 9, 2020 | History

2 edition of Influence of man-caused surface disturbance in permafrost areas of Alaska found in the catalog.

Influence of man-caused surface disturbance in permafrost areas of Alaska

report of special committee assigned by State Director of Alaska

by United States. Bureau of Land Management

  • 47 Want to read
  • 8 Currently reading

Published by Dept. of the Interior, Bureau of Land Management in [Anchorage, Alaska .
Written in English

    Subjects:
  • Thawing,
  • Erosion,
  • Frozen ground,
  • Water quality

  • Edition Notes

    Includes bibliographical references (p. [20-21]).

    StatementRobert D. Martin, chairman
    ContributionsMartin, R. D. (Robert D.), 1942-
    The Physical Object
    Paginationii, [21] p. ;
    Number of Pages21
    ID Numbers
    Open LibraryOL25333864M

    Alaska, the region is not immune to the problems associated with surface disturbances. Permafrost poses unique and interesting problems when disturbed by construction and mining. The massive forest fires so common in the Interior also present water quality issues if erosion. permafrost conditions in response to a suite of surface disturbance types. Here, we present three case studies illustrating the impacts of land cover changes on permafrost landscapes, and discuss the key importance of vegetation removal on permafrost dynamics at decadal timescales.

    not glaciated but are exposed to very cold conditions with frost action and development of permafrost areas: north russia, alaska, northern canada and the alps. formation of permafrost. form when subsoil temperatures remain below 0 for at least 2 consecutive years, permafrost forms reaching deep into surface layers (over m) - hardly any. D. L. Luo, Jin, H. J., Marchenko, S. S., and Romanovsky, V. E., “ Distribution and changes of active layer thickness (ALT) and soil temperature (TTOP) in the source.

    Larry Hinzman (standing in foreground) documented observations of this thermokarst – likely a sign of permafrost beneath the surface – in on the tundra of the North Slope of Alaska in the Kuparuk River watershed in the foothills of the Brooks Range. Permafrost A condition existing below the ground surface, in which the soil or bedrock material remains perennially frozen, below 0 degrees C for a minimum of two years. Currently affects approximately 26% of the Earth's surface.


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Influence of man-caused surface disturbance in permafrost areas of Alaska by United States. Bureau of Land Management Download PDF EPUB FB2

An illustration of an open book. Books. An illustration of two cells of a film strip. Video An illustration of an audio speaker. Influence of man-caused surface disturbance in permafrost areas of Alaska: report of special committee assigned by State Director of Alaska.

Get this from a library. Influence of man-caused surface disturbance in permafrost areas of Alaska: report of special committee assigned by State Director of Alaska. [R D Martin; United States. Bureau of Land Management.]. Using the calibrated model, we project near-surface permafrost will disappear on 16 to 24% of the area in Alaska and will be present on only 10 to 18% of the land in Alaska at the end of the 21st Century based on climate projections involving low (B1), moderate (A1B) and Cited by: Permafrost is soil, rock or sediment that is frozen for more than two consecutive years.

In areas not overlain by ice, it exists beneath a layer of soil, rock or sediment, which freezes and thaws annually and is called the "active layer". In practice, this means that permafrost occurs at an mean annual temperature of −2 °C ( °F) or in: International Permafrost Association.

See essays related to permafrost in the Arctic Report Card - Note: Inthe Arctic Report Card got a new look that included Permafrost as an Indicator which will be reported every years.

Therefore this link goes to the table showing Report Card topics by year, which links to the individual essays. Permafrost is permanently frozen ground.

Permafrost - Permafrost - Problems posed by permafrost: Development of the north demands an understanding of and the ability to cope with problems of the environment dictated by permafrost.

Although the frozen ground hinders agricultural and mining activities, the most dramatic, widespread, and economically important examples of the influence of permafrost on life in the north involve.

The study found that, from tothe number of dams grew from 2 to 98 in a square-mile study area near Kotzebue. In another study area covering all. Permafrost degradation associated with a warming climate is second only to wildfires as a major disturbance to boreal forests.

Permafrost temperatures have risen to 4 degrees C since the "Little. An alternative is to use a multi-channel datalogger to measure both the ground (5 cm depth) and permafrost surface (typically 1 m depth) temperatures.

The permafrost surface temperature sensor can be installed by driving a metal rod into the permafrost, removing it, and then inserting the sensor in.

A new permafrost map of Alaska, using a terrain-unit approach for mapping permafrost distribution based on climate and surficial geology is presented in conjunction with the Ninth International Conference on Permafrost held at the University of Alaska, June 29 to July 3, This map.

Influence of Surface Conditions on Surface Temperature. Geotechnical engineers working in areas of discontinuous permafrost are frequently faced with the necessity of designing facilities with a minimum of thermal disturbance. Construction activities cause a change in the surface characteristics that usually result in an increase in surface temperature during the summer months.

The collapsed areas caused by rich-ice permafrost degradation in central Alaska are rapidly colonized by aquatic herbaceous plants, leading to the development of a thick, floating organic mat. The studies about effects of permafrost degradation on woody vegetation at Arctic treeline on the Seward Peninsula, Alaska show that improved soil.

Permafrost - Permafrost - Surface manifestations of permafrost and seasonally frozen ground: Many distinctive surface manifestations of permafrost exist in the Arctic and subarctic, including such geomorphic features as polygonal ground, thermokarst phenomena, and pingos.

In addition to the above, there are many features caused in large part by frost action that are common in but not. Permafrost can persist at mean annual air temperatures (MAAT) of +2 °C and can degrade at MAAT of °C with the help of surface water.

Permafrost is decoupled from the atmosphere by the active. The impact of climate warming on permafrost and the potential of climate feedbacks resulting from permafrost thawing have recently received a great deal of attention. Ground temperatures are a primary indicator of permafrost stability.

Most of the permafrost observatories in the Northern Hemisphere show substantial warming of permafrost since circa [11] The “suprapermafrost zone” is situated below ground above the top of permafrost. In some areas, the depth to permafrost may exceed the depth of seasonal frost, particularly in areas recently perturbed by wildfire, a common occurrence in interior Alaska [e.g., Yoshikawa et al., ].

In these areas, groundwater flow may occur. Full Text; PDF ( K) PDF-Plus ( K) Suppl. data; Citing articles; Multi-year impacts of permafrost disturbance and thermal perturbation on High Arctic stream chemistry 1.

Daniel Lamhonwah, a M. Lafrenière, a S. Lamoureux, a B. Wolfe b a Department of Geography and Planning, Queen’s University, Kingston, ON K7L 3N6, Canada.

b Department of Geography and. ing of permafrost and observations of thawing —both conditions have serious, long-term implications for Alaska’s transportation network, for the Trans-Alaska Pipeline, and for the nearlyAlaskan cit-zens living in areas of permafrost. Climate research and scenarios for the 21st century also indicate that.

Focal Areas Permafrost characterization. Permafrost baseline characterization and monitoring are critical components for evaluating the vulnerability of hydrologic systems to subsurface warming. However, this type of information, with sufficient resolution for implementation into hydrologic models, is limited in permafrost regions.

Influence of Man-Caused Surface Disturbance in Permafrost Areas of Alaska. Report of a special committee assigned by State Director of Alaska. Viereck, L.A.

Ecological effects of river flooding and forest fires on permafrost in the taiga of Alaska in Permafrost. Proceedings of the 2d International Permafrost Conference, Yakutsk.

At Barrow, in northern Alaska, permafrost extends to m ( feet) It is under this latter circumstance that surface disturbances can seriously alter the permafrost regimen because it is then in tenuous equilibrium without the added stress of disturbance of an environ- mental factor.

It is the temperature at point Z that is used to.The influence of surface cover on thaw penetration in alpine and arctic soils of Alaska was determined.

Several manipulated treatments were employed: removal of all vegetation, mulching, shearing and fire. Thaw and subsidence more than doubled on the bare and sheared plots and increased up to 50% on the burned areas. Bulldozing of and traffic over ice-rich permafrost terrain resulted in.War II in areas underlain by frozen ground have demonstrated that a thorough under­ standing of the nature of permafrost is of prime importance for wise land-use plan­ ning.

Not only is it an economic requirement that the least possible disturbance be made of the frozen ground, but it is a practical.