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Full-Text Articles in Physical Sciences and Mathematics
Mechanical And Chemical Weathering Of Periglacial And Non-Periglacial Forms On The Eastern Fosheim Peninsula, Ellesmere Island (Northwest Territories), Cameron Lawrence Chadwick
Mechanical And Chemical Weathering Of Periglacial And Non-Periglacial Forms On The Eastern Fosheim Peninsula, Ellesmere Island (Northwest Territories), Cameron Lawrence Chadwick
Theses and Dissertations (Comprehensive)
The purpose of this study is to examine the differences in the mechanical and chemical weathering of different periglacial and non-periglacial forms on the eastern Fosheim Peninsula. Forms studied include: solifluction lobes, non-sorted stripes, polygons, mudboils, wetted sloped, dry ridge and wet meadow. Most sites including the periglacial forms of solifluction lobes, non-sorted stripes, and polygons show signs of chemical and mechanical weathering. The weathering found at all sites was minute but may be significant given the slow rates of weathering in this environment. The individual environmental variables of moisture and temperature levels do not appear to have a direct …
Relative Rates Of Sand Transport Through An Incipient Parabolic Dune At Pinery Provincial Park, Ontario (Ammophila Breviligulata, Calamovilfa Longifolia, Cakile Edentula, Juniperus Virginiana, Populus Deltoides), Sheri A. Longboat
Theses and Dissertations (Comprehensive)
Factors controlling the development, migration, and stability of an incipient parabolic dune in Pinery Provincial Park, Ontario were investigated in terms of grain size characteristics, rates of sediment transport, and local and regional winds. The parabolic dune, situated approximately 60 meters inland of Lake Huron, is dominated by sparsely scattered dune grass species of marram grass (Ammophila breviligulata), sand reed (Calamovilfa longifolia), and sea rocket (Cakile edentula). Small tree species of red cedar (Juniperus virginiana) and eastern cottonwood (Populus deltoides) emerge and increase in number beyond the parabolic dune. Mean grain sizes along a profile were coarsest on the beach …
Using Digital Elevation Models To Measure The Surface And Volumetric Change Of Athabasca Glacier, Alberta, Canada, 1919-1979, James Robb Reynolds
Using Digital Elevation Models To Measure The Surface And Volumetric Change Of Athabasca Glacier, Alberta, Canada, 1919-1979, James Robb Reynolds
Theses and Dissertations (Comprehensive)
The Athabasca Glacier (52˚12'N, 117˚14'W) located at the Alberta-British Columbia border was studied to quantify its volumetric, area and elevation changes below 2400 m between 1919 and 1979. The data sources consist of maps produced using aerial and terrestrial photogrammetry in the years between 1919 and 1979. The maps were digitized and converted into raster digital elevation models (DEMs), the manipulation of which allowed values of surface and volumetric change to be calculated. These DEMs showed that between 1919 and 1979 the glacier lost 2.344 x 108m3 of volume and receded more than 1 km. Each of the source maps …
Energy And Deforestation In Ghana: A Study Of Woodfuel-Deforestation Links In Rural Ghana, Iddrisu Adam
Energy And Deforestation In Ghana: A Study Of Woodfuel-Deforestation Links In Rural Ghana, Iddrisu Adam
Theses and Dissertations (Comprehensive)
Forests are one of the most valuable natural resources of many countries, including Ghana. Timber and other forest products have contributed immensely to the development of the country. These same forests have been a source of sustenance to the Ghanian people. Most particularly, forests have been the principal source of domestic energy by way of providing woodfuels. The heavy reliance on forest resources is taking its toll on the health of Ghanaian forests. In recent years, there has been increased awareness of the depletion of trees—a problem that many researchers have attributed to the over-exploitation of forests especially for domestic …
Managing External Threats To National Parks In Canada's Western Mountains (Alberta), George Yap
Managing External Threats To National Parks In Canada's Western Mountains (Alberta), George Yap
Theses and Dissertations (Comprehensive)
External threats to protected areas exist because the area encompassed by the legal boundaries of many protected areas is less than what is needed to maintain a minimum viable population of various animal species and some types of plant associations. While external stresses to parks are the result of a wide range of human activities, they threaten ecological integrity in two general ways: by contributing to habitat fragmentation, alienation and loss (HFAL), and/or undermining the long-term viability of transboundary animal populations. However, in comparison to internal threats, addressing external threats is considerably more complex since park managers have no legal …