Origin and large-scale erosional features of glacial-lake spillways in the northern Great Plains

Kehew, Alan E.; Lord, Mark

doi:10.1130/0016-7606(1986)97<162:oalefo>2.0.co;2

Cited by 106 publications

(55 citation statements)

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“…In contrast, bedrock erosional jökulhlaup impacts often characterise channeled jö kulhlaup routeways. Bedrock erosional jökulhlaup impacts are well documented for the Lake Missoula jökulhlaups that had discharges of up to 10 6 m 3 s À 1 (Baker, 1973;Smith, 1993;Benito, 1997), and for the Lake Bonneville flood, which was of the same magnitude (Kehew and Lord, 1986;O'Conner, 1993). Similar bedrock erosional and alluvial depositional impacts characterise the Chuya and Katun valley Altai jökulhlaups, which also had discharges of 10 6 m 3 s À 1 (Baker et al, 1993;Herget, 2002;Rudoy, 2002).…”

Section: Introduction and Rationalementioning

confidence: 73%

Geomorphological evidence for jökulhlaups from Kverkfjöll volcano, Iceland

2004

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Section: Introduction and Rationalementioning

confidence: 73%

Geomorphological evidence for jökulhlaups from Kverkfjöll volcano, Iceland

2004

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“…1 and 2). Glacial Lake Hind was one of several interconnected proglacial lakes that formed across the northern Prairies during the period of final (Late Wisconsinan) deglaciation (e.g., Klassen, 1972;Clayton and Moran, 1982;Fenton et al, 1983;Kehew and Clayton, 1983;Klassen, 1983;Kehew and Lord, 1986;Kehew and Teller, 1994;Sun and Teller, 1997). Lake Hind was part of the northern Plains proglacial lake-spillway system.…”

Section: Study Sitementioning

confidence: 99%

Paleoecology of an Early Holocene Wetland on the Canadian Prairies

Boyd

2005

gpq

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AbstractA plant macrofossil record from the glacial Lake Hind basin is used to reconstruct early postglacial wetland plant succession and paleohydrology. Between >10.6 and 9.1 ka BP, there are four plant assemblage zones: (1) an early (>10.6 ka BP) zone dominated by Cyperaceae and aquatics; (2) a subsequent zone (~10.6-10.1 ka BP) with emergents (Menyanthes trifoliata,Potentilla palustris,Scirpus validus) and fewer aquatic plants; (3) an interval between ~10.1 and 9.8 ka BP dominated byDrepanocladus aduncus; and (4) a zone between ~9.8 and 9.1 ka BP withMenyanthes trifoliataandEquisetum.These data indicate a gradual decline in water depth between 10.6 and 10.1 ka BP due to deepening of one or more outlets of glacial Lake Hind. From ~10.6 to 9.1 ka BP, the importance ofMenyanthesrecords pronounced, seasonal, flooding. Furthermore, lack of evidence for complete drawdown and terrestrialization in the basin – despite local and regional evidence for postglacial warming – indicates that this wetland was minimally impacted by climate change up to at least 9.1 ka BP. Persistence of very wet conditions locally is consistent with recent results from south-central Saskatchewan, and may be due to release of meltwater from stagnant ice. However, frequent low-energy flooding of the basin by the Souris River is more plausible. In general, the apparent insensitivity of aquatic habitats to abrupt climate change in some locales on the Canadian Prairies demonstrates the potential long-term mitigating effects of local hydrological factors.

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“…However, the "maturity" 578 of the flood-carved landscape may also be a factor. In the study by Kehew and Lord, 1986 which included 579 the Minnesota, Minot, Souris-Hind and Thunder spillways, only around 20% of the islands have approached 580 lemniscate geometry. In the English Channel case, we would put this number at around 50%, suggestingflood-parameters (duration, magnitude, suspended material etc) that resulted in more of the islands 582 reaching the optimum shape.…”

mentioning

confidence: 99%