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A catastrophic meltwater flood event and the formation of the Hudson Shelf Valley

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dc.contributor.author Thieler, E. Robert
dc.contributor.author Butman, Bradford
dc.contributor.author Schwab, William C.
dc.contributor.author Allison, Mead A.
dc.contributor.author Driscoll, Neal W.
dc.contributor.author Donnelly, Jeffrey P.
dc.contributor.author Uchupi, Elazar
dc.date.accessioned 2007-05-11T18:02:36Z
dc.date.available 2007-05-11T18:02:36Z
dc.date.issued 2007-01-04
dc.identifier.citation Palaeogeography, Palaeoclimatology, Palaeoecology 246 (2007): 120-136 en
dc.identifier.uri http://hdl.handle.net/1912/1630
dc.description This paper is not subject to U.S. copyright. The definitive version was published in Palaeogeography, Palaeoclimatology, Palaeoecology 246 (2007): 120-136, doi:10.1016/j.palaeo.2006.10.030. en
dc.description.abstract The Hudson Shelf Valley (HSV) is the largest physiographic feature on the U.S. mid-Atlantic continental shelf. The 150-km long valley is the submerged extension of the ancestral Hudson River Valley that connects to the Hudson Canyon. Unlike other incised valleys on the mid-Atlantic shelf, it has not been infilled with sediment during the Holocene. Analyses of multibeam bathymetry, acoustic backscatter intensity, and high-resolution seismic reflection profiles reveal morphologic and stratigraphic evidence for a catastrophic meltwater flood event that formed the modern HSV. The valley and its distal deposits record a discrete flood event that carved 15-m high banks, formed a 120-km2 field of 3- to 6-m high bedforms, and deposited a subaqueous delta on the outer shelf. The HSV is inferred to have been carved initially by precipitation and meltwater runoff during the advance of the Laurentide Ice Sheet, and later by the drainage of early proglacial lakes through stable spillways. A flood resulting from the failure of the terminal moraine dam at the Narrows between Staten Island and Long Island, New York, allowed glacial lakes in the Hudson and Ontario basins to drain across the continental shelf. Water level changes in the Hudson River basin associated with the catastrophic drainage of glacial lakes Iroquois, Vermont, and Albany around 11,450 14C year BP (~ 13,350 cal BP) may have precipitated dam failure at the Narrows. This 3200 km3 discharge of freshwater entered the North Atlantic proximal to the Gulf Stream and may have affected thermohaline circulation at the onset of the Intra-Allerød Cold Period. Based on bedform characteristics and fluvial morphology in the HSV, the maximum freshwater flux during the flood event is estimated to be ~ 0.46 Sv for a duration of ~ 80 days. en
dc.description.sponsorship Support for N. Driscoll was provided by the Office of Naval Research and the National Science Foundation en
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Elsevier B.V. en
dc.relation.uri http://dx.doi.org/10.1016/j.palaeo.2006.10.030
dc.subject Continental shelf en
dc.subject Glacial lakes en
dc.subject Meltwater en
dc.subject Sea-level rise en
dc.subject Transgression en
dc.subject Wisconsinan en
dc.title A catastrophic meltwater flood event and the formation of the Hudson Shelf Valley en
dc.type Article en
dc.identifier.doi 10.1016/j.palaeo.2006.10.030


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