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| Titel |
Review Article: Lake and breach hazard assessment for moraine-dammed lakes: an example from the Cordillera Blanca (Peru) |
| VerfasserIn |
A. Emmer, V. Vilímek |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 13, no. 6 ; Nr. 13, no. 6 (2013-06-18), S.1551-1565 |
| Datensatznummer |
250018500
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| Publikation (Nr.) |
 copernicus.org/nhess-13-1551-2013.pdf |
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| Zusammenfassung |
| Glacial lake outburst floods (GLOFs) and related debris flows represent a
significant threat in high mountainous areas across the globe. It is
necessary to quantify this threat so as to mitigate their
catastrophic effects. Complete GLOF hazard assessment incorporates two
phases: the probability of water release from a given glacial lake is
estimated through lake and breach hazard assessment while the endangered
areas are identified during downstream hazard assessment. This paper
outlines a number of methods of lake and breach hazard assessment, which can
be grouped into three categories: qualitative, of which we outline eight;
semi-quantitative, of which we outline two; and quantitative, of which we
outline three. It is considered that five groups of critical parameters are
essential for an accurate regionally focused hazard assessment method for
moraine-dammed lakes in the Cordillera Blanca. These comprise the
possibility of dynamic slope movements into the lake, the possibility of a
flood wave from a lake situated upstream, the possibility of dam rupture
following a large earthquake, the size of the dam freeboard (or ratio of dam
freeboard), and a distinction between natural dams and those with remedial
work. It is shown that none of the summarised methods uses all these
criteria with, at most, three of the five considered by the outlined
methods. A number of these methods were used on six selected moraine-dammed
lakes in the Cordillera Blanca: lakes Quitacocha, Checquiacocha,
Palcacocha, Llaca, Rajucolta, and Tararhua. The results have been compared
and show that each method has certain advantages and disadvantages when used
in this region. These methods demonstrate that the most hazardous lake is
Lake Palcacocha. |
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