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Repeated glacial-lake outburst floods in Patagonia: An increasing hazard?

Repeated glacial-lake outburst floods in Patagonia: An increasing hazard?

Dussaillant, Alejandro, Benito, Gerardo, Buytaert, Wouter, Carling, Paul, Meier, Claudio and Espinoza, Fabián (2009) Repeated glacial-lake outburst floods in Patagonia: An increasing hazard? Natural Hazards, 54 (2). pp. 469-481. ISSN 0921-030X (Print), 1573-0840 (Online) (doi:10.1007/s11069-009-9479-8)

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Abstract

Five similar glacial-lake outburst floods (GLOFs) occurred in April, October, December 2008, March and September 2009 in the Northern Patagonia Icefield. On each occasion, Cachet 2 Lake, dammed by the Colonia Glacier, released circa 200-million m3 water into the Colonia River. Refilling has occurred rapidly, such that further outbreak floods can be expected. Pipeflow calculations of the subglacial tunnel drainage and 1D hydraulic models of the river flood give consistent results, with an estimated peak discharge surpassing 3,000 m3 s−1. These floods were larger in magnitude than any flood on record, according to gauged data since 1963. However, geomorphological analysis of the Colonia valley shows physical evidence of former catastrophic outburst floods from a larger glacial-lake, with flood discharges possibly as high as 16,000 m3 s−1. Due to potential impacts of climate change on glacier dynamics in the area, jökulhlaups may increase future flood risks for infrastructure and population. This is particularly relevant in view of the current development of hydropower projects in Chilean Patagonia.

Item Type: Article
Additional Information: [1] Attached to this record is the Author’s Accepted Manuscript version of a paper published in NATURAL HAZARDS by Springer International Publishing on 10 November 2009. The final publication is available at Springer via http://dx.doi.org/10.1007/s11069-009-9479-8
Uncontrolled Keywords: jӧkulhlaup, outburst flood, Patagonia, glacial-lake, climate change
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
G Geography. Anthropology. Recreation > GC Oceanography
G Geography. Anthropology. Recreation > GE Environmental Sciences
Pre-2014 Departments: School of Engineering
School of Engineering > Department of Civil Engineering
Related URLs:
Last Modified: 17 Oct 2016 14:50
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/9651

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