Browsing by Author "Harris, Stuart A."
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Item Embargo A Pedalogical study of the Trout Creek Basin, Porcupine Hills, Alberta(1972) Mee, Cathleen Eyre; Harris, Stuart A.Item Open Access A study of peat plateaux and peat mounds in Frances River Valley, SE Yukon Territory(1990) Schmidt, Irena Hribar; Harris, Stuart A.Item Open Access Item Embargo Debris flows along the Slims River Valley, Kluane National Park, Yukon Territory(1986) Gustafson, Catherine Anne; Harris, Stuart A.Item Embargo Dendrochronological studies in the Slims River Valley, Yukon Territory(1982) Allen, Harriet Dorothy; Harris, Stuart A.Item Embargo Distribution and selected characteristics of high altitude patterned ground in the summit area of Plateau Mountain, Alberta(1978) Woods, Charles B.; Harris, Stuart A.Item Embargo Glacial geomorphology of an area near Calgary, Alberta, between the Bow River and Fish Creek valleys(1974) Glendinning, Gerald Ronald; Harris, Stuart A.Item Embargo Glacial geomorphology of the Trout Creek area Porcupine Hills, Alberta(1971) Day, David Leslie; Harris, Stuart A.Item Open Access History of the upper Highwood River terraces west of Longview, southwest Alberta(1991) Wiegele, Patricia Mary; Harris, Stuart A.Item Embargo Late Wisconsin ice movements and deglaciation: in the N.E. Porcupine Hills area, Alberta(1977) Love, Michael Andrew; Harris, Stuart A.The study of a 1476 km2 area located in the N.E. Porcupine Hills of Southwest Alberta, has provided most evidence for the movement and retreat of two Late Wisconsinan ice masses; the hybrid Marguerite (western) and Lochend (eastern) ice sheets. Although most evidence is given for the last glaciation, information is cited which relates to the earlier eastern Labuma and Maunsell advances of glacial Events Three and Two age respectively. No deposits from earlier western incursions of ice have been found, though it is known from mapping in an adjacent area to the west (Waters, 1975) that such advances entered that area. _x000D_ Evidence relating to the Labuma advance consists of the high level igneolis and metamorphic erratics. Maunsell deposits are much more coherent and may be found in a small zone in the southwest portion of the area. Hybrid Marguerite till displays mixed characteristics, though on the basis of pebble lithology it can easily be differentiated from the eastern tills in the area. The hybrid Marguerite glacier undoubtedly assimilated foreign eastern material as it flowed southwards over areas previously traversed by Laurentide advances. It was deflected southwards by the Lochend ice sheet which lay to the east of the mountains. Laboratory analyses confirm the eastern origin of the Lochend till. Both ice masses are considered to have been coeval. _x000D_ During deglaciation, which was effected by both ice stagnation and orderly re treat, a large proglacial lake (Lake Eden) was impounded in the area for which two still-stands have been recognized. An efficient system of meltwater channels formed at this time as the lake was drained. From 14c dates given by various researchers (e.g. Harris and Boydell, 1972) the area most probably became free of ice during the very early Holocene.Item Open Access Late-Wisconsin ice in the Morley Flats area of the Bow Valley and adjacent areas of the Kananaskis Valley, Alberta(1971) Walker, Michael J. C.; Harris, Stuart A.Item Metadata only Multiple glaciation in the Foothills, Rocky Mountain House Area, Alberta(1972) Boydell, A. N. (Anthony Nigel); Harris, Stuart A.Item Open Access Permafrost, fire, and the regeneration of white spruce at arctic treeline near Inuvik, Northwest Territories, Canada(1983) Greene, David F. (David Freeman), 1951-; Harris, Stuart A.Item Embargo Physical, chemical and isotopic investigations of Ward Hunt Ice Shelf and Milne Ice Shelf, Ellesmere Island, NWT(1985) Jeffries, Martin Orme; Harris, Stuart A.The object of the research was to investigate the growth and structure of Ward Hunt and Milne Ice Shelves which have recently produced ice islands. The work involved ice core drilling and collection of snow and fiord water samples. These have been the subject of conductivity (SEC)-salinity, 180, tritium, ice density and ice texture analysis. Accorct;ng to these parameters, ten ice types have been identified (Tables 5.12A and 5.12B) and each is found in or adjacent to the ice shelves and plays a role in their growth and structure (Fig. 5.40). Ward Hunt Ice Shelf is largely composed of three types of basement ice, which are the product of a sequence of processes which transform first-year sea ice to very old multiyear sea ice, in the absence of 18 O depleted meltwater. Milne Ice Shelf is largely composed of glacier tongues which flowed into and coalesced in Milne Fjord. The ice tongues and the basement ice acted as stable platforms for further ice shelf thickening through snow and ice accumulation. The latter involved percolation and refreezing of meltwater, with attending isotopic homogenization and enrichment from snow o values of -31 .0 0 loo to ice o values of -29.2 0 loo. During periods of negative surface mass balance, meltwater accumulates in meltwater lakes in the summer and refreezes to trough ice (o 18 o, -24.0 °100) in the winter. The ice shelves act as dams creating stratified conditions of freshwater (runoff) overlying seawater (Arctic surface water and/or Atlantic water) in Disraeli Fjord and inner Milne Fjord. The freshwater just above the halocline is supercooled; frazil ice forms and floats to the surface and accretes as a freshwater fjord ice with a o1 8 O value of -26.0 0 loo. During a climatic amelioration ea. 250012000 BP to ea. 1600 BP, an extensive freshwater flow beneath Ward Hunt Ice Shelf led to the accretion of a freshwater, 18 O depleted ice (-25.5 0 loo), which originated with frazil ice growth, and is now sandwiched between basement ice layers. The conductivity and o18o value of this ice indicates that frazil ice growth and accretion at the bottom of the ice shelves does not lead to "brackish" basement ice growth as suggested by Lyons et al. (1971). The re-entrant (or multiyear) sea ice that has grown at the front of Milne Ice Shelf is the closest analogy to "brackish" ice. In this ice, salinity ranges from zero to 2.84 °100, and o18 o ranges from -23.8 0 loo to -4.2 0 loo. This variation, which is manifested as seasonal and 10 year fluctuations of salinity and 18 0, arises from similar variation in the water beneath the ice. Each summer, 180 depleted meltwater dilutes the underlying seawater. At the end of the summer a low salinity-low 180 ice freezes first and is followed by higher salinity-higher 180 winter ice. The annual and 10 year stratification leads to an interfingering of fresh, brackish and saline ice which resembles "brackish ice". Re-entrant ice is influenced by 18 O depleted meltwater, but basement ice is not. The ice shelves have experienced two periods of expansion and two periods of wastage. Re-entrant ice, which precedes basement ice growth, is forming during the present period of ice wastage. If the climate deteriorates, re-entrant ice might be succeeded by basement ice growth and further ice shelf expansion and thickening.Item Embargo Quaternary history of part of the Rocky Mountains, foothills, plains and western Porcupine Hills, Southwestern Alberta(1972) Alley, Neville Foster; Harris, Stuart A.Item Embargo Relationship of late-Wisconsin Rocky Mountain and Laurentide ice in the vicinity of Sundre, Alberta(1970) Boydell, A. N. (Anthony Nigel); Harris, Stuart A.Item Embargo Some aspects of the distribution and mechanics of soil erosion under furrow irrigation in the Bow Island area, Alberta(1970) Adeniji, Francis Adeyemi; Harris, Stuart A.Item Open Access Stable isotope composition of cave ice in western North America(1994) MacDonald, William Dugald; Harris, Stuart A.Item Open Access Studies of an active rock glacier, east side, Slims River valley, Yukon Territory, Canada(1988) Blumstengel, Wayne Kurt; Harris, Stuart A.Item Open Access