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dc.contributor.author Hubbard, Bryn
dc.contributor.author Heald, A.
dc.contributor.author Reynolds, J.
dc.contributor.author Quincey, Duncan J.
dc.contributor.author Richardson, Shaun David
dc.date.accessioned 2008-12-11T15:43:48Z
dc.date.available 2008-12-11T15:43:48Z
dc.date.issued 2005-09
dc.identifier.citation Hubbard , B , Heald , A , Reynolds , J , Quincey , D J & Richardson , S D 2005 , ' Impact of a rock avalanche on a moraine-dammed proglacial lake: Laguna Safuna Alta, Cordillera Blanca, Peru ' Earth Surface Processes and Landforms , vol 30 , no. 10 , pp. 1251-1264 . , 10.1002/esp.1198 en
dc.identifier.issn 0197-9337
dc.identifier.other PURE: 94470
dc.identifier.other dspace: 2160/1554
dc.identifier.uri http://hdl.handle.net/2160/1554
dc.description Hubbard, Bryn; Heald, A.; Reynolds, J.; Quincey, D., (2005) 'Impact of a rock avalanche on a moraine-dammed proglacial lake: Laguna Safuna Alta, Cordillera Blanca, Peru', Earth Surface Processes and Landforms 30(10) pp.1251-1264 RAE2008 en
dc.description.abstract Moraines that dam proglacial lakes pose an increasing hazard to communities in the Andes and other mountain ranges. The moraines are prone to failure through collapse, overtopping by lake waters or the effect of displacement waves resulting from ice and rock avalanches. Resulting floods have led to the loss of thousands of lives in the Cordillera Blanca mountains of Peru alone in the last 100 years. On 22 April 2002 a rock avalanche occurred immediately to the south-west of Laguna Safuna Alta, in the Cordillera Blanca. The geomorphic evidence for the nature, magnitude and consequences of this event was investigated in August 2002. Field mapping indicated that the avalanche deposited 8-20 × 106 m3 of rock into the lake and onto the surface of the frontal region of Glaciar Pucajirca, which flows into the lake. Repeated bathymetric surveying indicated that 5 × 106 m3 of this material was deposited directly into the lake. The immediate effect of this event was to create a displacement wave that gained in height as it travelled along the lake basin, overtopping the impounding moraine at the lake's northern end. To achieve overtopping, the maximum wave height must have been greater than 100 m. This, and subsequent seiche waves, caused extensive erosion of both the proximal and distal faces of the impounding terminal moraine. Further deep gullying of the distal face of this moraine resulted from the supply of pressurized water to the face via a relief overflow tunnel constructed in 1978. Two-dimensional, steady-state analysis of the stability of the post-avalanche moraine rampart indicates that its proximal face remains susceptible to major large-scale rotational failure. en
dc.format.extent 14 en
dc.language.iso eng
dc.relation.ispartof Earth Surface Processes and Landforms en
dc.title Impact of a rock avalanche on a moraine-dammed proglacial lake: Laguna Safuna Alta, Cordillera Blanca, Peru en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1002/esp.1198
dc.contributor.institution Centre for Glaciology en
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.description.status Peer reviewed en


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