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Patterned Ground

Author : Stephan Harrison
ISBN : 1861891814
Genre : Education
File Size : 31.70 MB
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Elizabeth A. Kaye specializes in communications as part of her coaching and consulting practice. She has edited Requirements for Certification since the 2000-01 edition.
Category: Education

Origin And Environmental Significance Of Large Scale Patterned Ground Donnelly Dome Area Alaska

Author : Richard E. Church
ISBN : MINN:31951P01177697U
Genre : Frozen ground
File Size : 65.27 MB
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Large-scale patterned ground in the Donnelly Dome area of central Alaska consists of polygons 25 to 46 m in diameter bounded by shallow troughs 1 to 2 m wide that form the sides of the polygons. The troughs are underlain by wedge-shaped masses of sediments that extend downward 2 to 3 m. Texture of the sediments of the wedges is distinct from that of the poorly stratified glacial outwash gravel that the wedges transect. Sediments of the wedge vary texturally along the strike and vertically within a given wedge. The coarsest material in the wedge is about 75 mm in diameter, which is the same size as the coarsest material in the outwash. The fine material in the wedges is silt, the same as that which blankets the area. The patterned ground of the Donnelly Dome area originated during Wisconsin time when the mean annual air temperature was at least 3C colder than now. Wigh the warming of the climate in post-Wisconsin time most of the perennially frozen gravel thawed and the ice wedges melted. The voids created by the melting of the ice wedges were filled with sediment that was washed from the surface or collapsed from the thawed sides of the voids. The troughs bounding the polygons are now, however, no longer underlain with ice wedges but with ice wedge pseudomorphs (fossil ice wedges). (Author).
Category: Frozen ground

Plugs And Plug Circles

Author : Albert Lincoln Washburn
ISBN : 9780813711904
Genre : Travel
File Size : 64.38 MB
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Patterned ground, encompassing circles, nets, polygons, and stripes, indicate soil, temperature, hydrologic, and other environmental conditions, past and present. Plug circles and plugs, a variety of patterned ground, occur in both nonsorted and sorted forms in permafrost environments. Study in the Canadian High Arctic, and a review of hypotheses of origin support the conclusion that plug circles and plugs are diapiric forms resulting from frost heaving, and that surfaceward seepage accounts for many occurences. This title focuses on many of the aspects of patterned ground, plugs and plug circles detailing circulatory soil processes and examining origin.
Category: Travel

Novel Technologies For Microwave And Millimeter Wave Applications

Author : Jean-Fu Kiang
ISBN : 9781475741568
Genre : Technology & Engineering
File Size : 23.5 MB
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Novel Technologies for Microwave and Millimeter-Wave Applications provides an overview of current research status in selected field, to facilitate a learning process from concepts to practices, from component design to system architecture, and from small scale to large scale. Each chapter focuses on a topic and is organized to be self-sufficient. Contents in each chapter include concise description of relevant background information, major issues, current trend and future challenges. Useful references are also listed for further reading. Novel Technologies for Microwave and Millimeter-Wave Applications is suitable as a textbook for senior or graduate courses in microwave engineering.
Category: Technology & Engineering

Contemporary Sorted Patterned Ground In Low Altitude Areas Of Tasmania

Author :
ISBN : OCLC:1051921283
Genre :
File Size : 31.66 MB
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Abstract This paper summarises the distribution of patterned ground phenomena in Tasmania. It presents observations of low altitude sorted stone circles forming on glacial and alluvial deposits in the vicinity of Queenstown, Western Tasmania. Evidence suggests that freeze‐thaw derived patterned ground could develop in most inland valleys in Tasmania where cold air drainage causes sub‐zero ground temperatures in winter and permits the formation of ground and segregation ice to low elevations. Field observations suggest that patterned ground can only develop where freeze‐thaw processes are not inhibited by vegetation. The occurrence of patterned ground below altitudes of 900 m asl in Tasmania is largely a result of anthropogenic disturbance.

Permafrost Response On Economic Development Environmental Security And Natural Resources

Author : R. Paepe
ISBN : 0792367847
Genre : Nature
File Size : 43.59 MB
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The permafrost regions of the planet are remote, barren and isolated; as far as the decision makers are concerned, these inhospitable regions are simply "out of sight, out of mind", having no immediate effect on the global environment and habitat. Those who are pioneering the study of the permafrost, however, know better, as they confront the sustainable development of these peculiarly resource-rich regions. It rapidly became evident that social survival was not merely a matter of technology, and sustainable development involved more than just bringing in adequate machinery. Operating in permafrost regions necessitates a thorough understanding of all aspects of their ecology. This state-of-the-art book on permafrost discusses the topic in terms of geology, biology, chemistry, physics, climatology, engineering, land development, environmental management, social and economic impacts. Topics discussed include on- and offshore data assessment, past and future permafrost evolution according to global climate change, engineering effects on permafrost, and new dimensions in geocryology, including gas hydrates, microbiology, and information technology.
Category: Nature