Benito, G., Thorndycraft, V. R., Machado, M. J., Sancho, C., Dussaillant, A. and Meier, C. I. (2014) Magnitude and timing of Holocene glacial lake outburst floods in the Baker River, Northern Patagonian Icefield, Chile / Magnitud y frecuencia de inundaciones Holocenas generadas por vaciamiento de lagos glaciares en el Rio Baker, Campo de Hielo, Patagonico Norte, Chile. In: Avances de la Geomorfología en España 2012-2014. Libro de Actas de la XIII Reunión Nacional de Geomorfología. Sociedad Española de Geomorfología, Cáceres, Spain, pp. 24-27. ISBN 9788461711239

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Abstract

The Baker River (Southern Chile) drains a catchment of 27,000 km2 and has a mean annual discharge of 1100 m3s-1. Since last deglaciation, the morpho-sedimentology of the Baker valley has been controlled by Outburst Floods (OFs) of different scales. We apply geomorphic mapping, stratigraphy (including radiocarbon and OSL dating) and palaeoflood hydrology to reconstruct the frequency, timing and magnitude of Holocene OFs. Geomorphic mapping reveals evidence of two Holocene alluvial terraces. The oldest (highest) contains basal gravels capped by a well-developed buried Podzolic Luvisol that was radiocarbon dated to 6160±40 BP. In this alluvial sequence, at least two major floods occurred between then and 5300 BP and at least eight major floods between 5300-2500 BP. At least three Late Holocene (post 610±30 BP) GLOF event(s) inundated upper terrace surfaces along the reach downstream the confluence of the Colonia River into the Baker River. We report on the implications of this palaeoflood research in relation to the proposed HydroAysén hydroelectric scheme.

Item Type:	Conference Proceedings
Title of Proceedings:	Avances de la Geomorfología en España 2012-2014. Libro de Actas de la XIII Reunión Nacional de Geomorfología
Additional Information:	[1] In Parte 1 (of three parts) forming the proceedings of the XIII Reunión Nacional de Geomorfología, held 9-12 September 2014, Cáceres, Spain. [2] Acknowledgements (funding) - Agradecimientos Este trabajo se ha realizado con financiación de los proyectos intramural del CSIC 201430E003. Es una contribución del Grupo PaleoQ (Universidad de Zaragoza-Gobierno de Aragón). A. Dussaillant ha sido financiado por UoG RAE-ENG-11-13. V. Thorndycraft obtuvo financiación en 2012 del Research Strategy Fund grant del Royal Holloway University of London, y en 2010 estuvo apoyado por el Natural Resources Defense Council.
Uncontrolled Keywords:	palaeoflood, paleohydrology, GLOF, Patagonia, Chile, flood hazard
Subjects:	G Geography. Anthropology. Recreation > GB Physical geography G Geography. Anthropology. Recreation > GE Environmental Sciences T Technology > TA Engineering (General). Civil engineering (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Engineering (ENG)
Related URLs:	Publisher Publisher
Last Modified:	08 Nov 2019 12:57
URI:	http://gala.gre.ac.uk/id/eprint/12815

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