Characteristic of basins and valleys eroded by glaciers
Sognefjord in Norway, the second longest fjord in the world, shows characteristic overdeepening.
Overdeepening is a characteristic of basins and valleys eroded by glaciers. An overdeepened valley profile is often eroded to depths which are hundreds of metres below the lowest continuous surface line (the thalweg) along a valley or watercourse. This phenomenon is observed under modern day glaciers, in salt-water fjords and fresh-water lakes remaining after glaciers melt, as well as in tunnel valleys which are partially or totally filled with sediment. When the channel produced by a glacier is filled with debris, the subsurface geomorphic structure is found to be erosionally cut into bedrock and subsequently filled by sediments. These overdeepened cuts into bedrock structures can reach a depth of several hundred metres below the valley floor.[1]
Overdeepened fjords and lakes have significant economic value as harbours and fisheries. Overdeepened basins and valleys filled with sediment (termed tunnel valleys) are of particular interest to engineers, petroleum geologists, and hydrologists; engineers apply the information for developing foundations and tunnel construction, petroleum geologists use tunnel valley locations to identify potential oil fields, while hydrologists apply this knowledge for groundwater resource management.[1]
^ abFiebig, Markus; Frank Preusser; Kurt Decker; Christian Schlüchter (2010). "Preface: special section of papers dealing with overdeepened basins and valleys in the alpine realm". Swiss Journal of Geosciences. 103 (3): 327–328. doi:10.1007/s00015-010-0040-2.
Overdeepening is a characteristic of basins and valleys eroded by glaciers. An overdeepened valley profile is often eroded to depths which are hundreds...
lake) behind a dam, which marks the downstream limit of the glacial overdeepening. The dam itself can be composed of moraine, glacial till, or a lip of...
Crater Lake, the deepest, and Lake Tahoe, the second deepest. Because of overdeepening, the sides of this lake drop steeply to its bottom. The deepest part...
been covered by thick ice in prehistory. Thresholds at the mouths and overdeepening of fjords compared to the ocean are the strongest evidence of glacial...
Lake "Veľké Hincovo pleso" in High Tatras, Slovakia. The lake occupies an "overdeepening" carved by flowing ice that once occupied this glacial valley....
glacier, in which the lake forms Tarn: A lake formed in a cirque by overdeepening Paternoster lake: A series of lakes in a glacial valley, formed when...
depression was partially stripped of its sedimentary rock fill by glacial overdeepening. During the Last Glacial Maximum, about 17,000 years BP, the lake served...
many phases of deformation. The loch occupies a basin produced by the overdeepening of the valley by glacial erosion, along an east-west fault line. It...
attendant glaciers carving the landscape into a typical postglacial one, overdeepening river valleys into the characteristic U-shape and leaving the upland...
The geological term finger lake refers to a long, narrow lake in an overdeepened glacial valley, while the proper name Finger Lakes goes back to the late...
distribution through the West Highlands reflects their origin in the glacial overdeepening of the straths and glens they now occupy. Loch is a Scottish Gaelic...
northern Washington state. It is dissected by numerous elongated, glacially-overdeepened lake basins which are formed by the same mechanisms as coastal fjords...
that are several hundred meters deep may be caused by a process called overdeepening. In mountain valleys where glacier movement has formed circular depressions...
004 ft) deep, Totak is the 11th deepest lake in Norway. This tremendous overdeepening marks it as a glacially formed lake with characteristics similar to...
49 m (161 ft), the maximum depth of the lake is 314 m (1,030 ft). This overdeepening, as well as its long and narrow shape, are characteristics of glacially-formed...
Baltic seabed shows that the depression has been subject to glacial overdeepening. The date during which glacier ice carved these troughs is not known...
places. Aialik Glacier, which has created the bay via the process of overdeepening, has since retreated by 4.5 miles. It is a major destination within...
U-shaped glacial valley in the Pacific Ranges of the Coast Mountains. The overdeepening of the lower end of the valley over the span of the Wisconsin glaciation...
chronostratigraphic dating; these fine muds are easily eroded. When the sea returned overdeepening the basin, salt water waterfalls eroded a 200 m depression patterned...
to: Finger lake, a narrow linear body of water occupying a glacially overdeepened valley Finger Lakes, New York, U.S. Finger Lake (Alaska), U.S. Finger...
150 ft) deep. They vary in depth along their course, exhibiting overdeepening; overdeepened sections cut into bedrock and typically are significantly deeper...
Hombrechtikon into the Glatttal towards Niederweningen, and eroded the overdeepened rock rut of the present Wehntal area. During melting of the glacier,...
mountain range through abrasion, crushing and plucking, and create large overdeepenings. Besides, glacial melt contributes to fluvial discharge, and determines...
Hombrechtikon into the Glatttal towards Niederweningen, and eroded the overdeepened rock rut of the present Wehntal area. After another glacial maximum about...
trough lake, is "a narrow linear body of water occupying a glacially overdeepened valley and sometimes impounded by a morainic dam." Where one end of a...
natural dam, behind which the ice of the Trift glacier has carved out an overdeepened basin and which is cut through by the Triftwasser in a narrow canyon...
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