Record details

Title
    Glacier Retreat, Lakes Development and Associated Natural Hazards in Cordilera Blanca, Peru
Author
    Cochachin, A.
    Emmer, A.
    Klimeš, Jan
    Vilímek, V.
Language
    anglicky
Publication type
    část monografie (kapitola)
Source title - monograph
    Landslides in Cold Regions in the Context of Climate Change
Pages
    S. 231-252
Notes
    Projekt: GAP209/11/1000, GA ČR, CZ3cav_un_auth*0273126
    Rozsah: 22 s. : P9300
Subject category
    dynamic slope movements
    glacier retreat
    GLOFs
    natural hazards
Keyword
    Associated
    Blanca
    Cordilera
    Development
    Glacier
    Hazards
    Lakes
    Natural
    Peru
    Retreat
Abstract (in english)
   Cordillera Blanca is the heaviest glacierized tropical range in the world. Due to the global climate change, most of glaciers are retreating and thinning. Glacier retreat leads to the formation and development of all types of potentially hazardous glacial lakes (bedrock-dammed, moraine-dammed, and ice-dammed). Potential hazardousness of glacial lakes is strongly interconnected with dynamic slope movements: (1) sudden release of water from glacial lakes (also known as glacial lake outburst floods-GLOF) is mainly caused by dynamic slope movement into the lake (about 80 % in the Cordillera Blanca); (2) released water may easily transform into debris-flow or mud-flow, thanks to its high erosion and transport potential. Based on field study and remotely sensed images, this contribution documents glacier retreat in the Cordillera Blanca with regards to formation and development of new potentially hazardous glacial lakes, which evolve mainly in elevations of about 4,600-5,000 m a.s.l.
   We introduce and describe three hazardous events associated with glacier retreat in the last decade: (a) sudden release of water from moraine-dammed Lake Palcacocha in 2003; (b) sudden release of water from bedrock-dammed lake No. 513 in 2010; and (c) sudden release of water from bedrock-dammed Lake Artizon Alto and subsequent moraine dam failure of downstream situated Lake Artizon Bajo in 2012. The first and third events were caused by landslides of lateral moraines (which are often nonconsolidated and nearly vertical) into the lakes. The second event was caused by ice- and rockfall into the lake. These events illustrate that various natural hazards (dynamic slope movements, floods) associated with glacier retreat in the Cordillera Blanca are closely linked and represent actual threats to urbanization and safety of lives and property.
Contributor
    AV ČR Brno, Ústav struktury minerálů a hornin
Contributor code
    AV ČR, ÚSMH
Source format
    U
Import date
    24. 10. 2014