Download PDF by David Evans: Glacial Landsystems

By David Evans

ISBN-10: 0340806656

ISBN-13: 9780340806654

ISBN-10: 0340806664

ISBN-13: 9780340806661

This e-book is a finished evaluation of the ever- pleasing box of glaciation from the point of view of glacial landsystems. This process versions the numerous procedures, types and interactions that may be present in glaciated landscapes during the international. This e-book is a necessary reference for an individual embarking upon study or or engineering surveys in glaciated basins and offers a wide-ranging instruction manual of glacial landsystem stpes for college kids of glaciation.

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1995; Fig. 4). The model of Matthews et al. (1995) involves the winter freeze-on of supraglacial waterlain sediments and subglacial till that accumulate on and under the snout behind a large moraine. The moraine volume is increased each year as the glacier advances over its proximal slope and then melts out, draping the moraine surface with a layer of subglacial till and supraglacial outwash. Krüger (1993, 1994a, 1996) proposes a mechanism of incremental stacking of frozen subglacial till slabs.

Although emphasis is placed upon terrestrial margins, fjord depositional settings are also discussed. 1 Glaciology Due to the severity of the regional climate, much of the glacier ice in the Canadian and Greenland high arctic is below the pressure melting point, particularly where mean annual air temperatures and glacier thickness are low (Koerner, 1989). , 1988; Higgins, 1989; Weidick, 1995). Because melting is largely restricted to the glacier surface and englacial drainage routes, and because glacier margins are predominantly cold-based, the glaciers of the 45 46 GLACIAL LANDSYSTEMS region are classified as sub-polar (Paterson, 1994; Benn and Evans, 1998).

Although meltwater continued to be delivered to this part of the glacier snout it began to flow sub-marginally along the base of the ice-contact slope of the fan, thereby producing a smaller esker running parallel to the glacier margin. 3 ANCIENT RECORDS OF ACTIVE TEMPERATE GLACIER MARGINS As active temperate glaciers provide us with a clear impression of their former passage, their impacts on ancient glaciated terrains should be identifiable. One excellent example in western 35 36 GLACIAL LANDSYSTEMS Po Meltwater Glacier ice Till Deltaic sands Glacilacustrine silt and clay Outwash ten tio me tric su rfa ce Sand ur fa Subglacial erosion Po n (A) A Fluvial deposition ten tiom etri cs urfa ce Sandur fan Subglacial erosion Po Subaerial erosion B (B) Fluvial deposition ten tiom etr ic s C (C) urf ace Subaqueous fan Subglacial deposition Subglacial erosion Lake Glacilacustrine deposition Canada has been identified by Evans et al.

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Glacial Landsystems by David Evans


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