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142:) up to 18 meters high and 225 meters in wavelength were created in several locations along the lake bottom. They are best developed just east of the Tyetyo River in the eastern part of the Kuray Basin, but several other smaller fields of giant current ripples also occur there. They are made up of rounded pebble gravel.
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Rudoy A.N. Mountain Ice-Dammed Lakes of
Southern Siberia and their Influence on the Development and Regime of the Runoff Systems of North Asia in the Late Pleistocene. Chapter 16. (P. 215—234.) — Palaeohydrology and Environmental Change / Eds: G. Benito, V.R. Baker, K.J. Gregory. — Chichester: John
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Towards the end of the last glacial period, 12,000 to 15,000 years ago, glaciers descending from the Altai mountains dammed the Chuya River, a large tributary of the Katun River, creating a large glacial lake including the Chuya and the Kurai basins. As the lake grew larger and deeper, the ice dam
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on the inner bends of the river, paralleling the scoured bare bedrock walls of the cut bank on the outer bends. These bars diminish in height and thickness downstream to about 60 m near Gorno-Altaisk. Some of these giant point bars have formed lakes behind them where they block tributaries of the
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The precise timings of the several catastrophic flooding events are not tightly constrained. The mechanisms of lake filling and ice dam failure would suggest an early or late glacial time, whereas conditions at glacial maxima would seem to preclude such events. The catastrophic flood(s) occurred
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Grosswald, M.G., 1998, New approach to the ice age paleohydrology of northern
Eurasia. Chapter 15. (P. 199-214)— Palaeohydrology and Environmental Change / Eds: G. Benito, V.R. Baker, K.J. Gregory. — Chichester: John Wiley & Sons Ltd, 1998. 353
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Most of the water discharge is thought to have occurred during one day, with peak discharges of 10 m/s (Herget, 2005). The maximum lake volume was 6x10 m (600 km) with an area of 1.5x10 m. The ice dam was about 650 m high.
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rivers, rising as much as 300m above modern river levels, with lengths up to five kilometers. Well-developed on the Katun River below its confluence with the Chuya River, the bars appear to have formed as giant
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giant glacier-dammed lakes in inter-montane basins of the Altai
Mountain range. The largest of these lakes (the conjoined Chuya and Kuray) had a water volume of 600 cubic kilometers when it burst.
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367:"Rudoy, A.N., Glacier-dammed lakes and geological work of glacial superfloods in the Late Pleistocene, Southern Siberia, Altai Mountains, Quaternary International, 2002, Vol. 87/1, pp. 119-140"
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Alexei N. Rudoy, 2005. Giant current ripples (History of the
Research, their diagnostics and palaeogeographical significance). - Tomsk. - 224 pp. In Russian, Eng. summary: pp. 134-211 pp.
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Much of the gravel deposited along the Katun valley lacks a stratigraphic structure, showing characteristics of a deposition directly after suspension in a turbulent flow.
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V.R. Baker. The
Spokane Flood debates: historical background and philosophical perspective //Geological Society, London, Special Publications 2008; v. 301; p. 33-50.
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eventually failed, causing a catastrophic flood that spilled along the Katun River. Its magnitude has been estimated to be similar to that of the
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Lake (left) formed behind a gravel bar (right) deposited during the flood. The floodway along the Katun river runs behind the bar, parallel to it
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have been researched since the 1920s. In the 1980s, Russian geologists discovered large deposits created through similar
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Sedimentary effects of cataclysmic late
Pleistocene glacial outburst flooding, Altay Mountains, Siberia
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River to the confluence with the Katun River, followed the Katun into the Ob River, and then into
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Diluvial bars in
Central Altay Mountains, Katun River, Little Yaloman Village. July 2011
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were the result of periodic sudden ruptures of ice dams like those triggering the
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Eddy deposits are seen along the Katun River between Inya and Mali
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Paleohydrology of late
Pleistocene Superflooding, Altay Mountains, Siberia,
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Ice-rafted boulders up to several meters in diameter exist in the area.
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Pleistocene lake sediments in the Chuya Basin, showing possible
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Outlet of the Chuya Basin looking in the direction of flow.
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Giant current ripples in the Kuray Basin, Altai, Russia
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When the ice dam failed, floodwaters coursed down the
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192:Suspension gravel deposits near the Katun River
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396:// Sedimentary Geology, 85 (1993) 53-62"
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419:Baker, V. R., G. Benito, A. N. Rudoy,
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150:Giant bars are found along the lower
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16:Prehistoric event in Central Asia
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457:Lee, 2004, The Altay Flood
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224:The current understanding
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304:Giant current ripples
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136:Giant current ripples
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184:Suspension gravels
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42:50.28528; 87.67111
292:Mediterranean Sea
200:Ice-rafted blocks
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284:Caspian Sea
266:Flood route
120:Pleistocene
84:Katun River
76:Altai flood
57:Katun River
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489:Megafloods
478:Categories
406:2011-10-14
377:2011-10-14
323:References
276:Lake Mansi
161:point bars
106:Background
28:87°40′16″E
25:50°17′07″N
288:Black Sea
140:antidunes
465:Archived
351:Archived
298:See also
280:Aral Sea
154:and the
126:Deposits
94:. These
92:ice age
86:in the
253:Timing
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272:Chuya
156:Katun
152:Chuya
80:flood
74:The
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