Podrobnosti záznamu

Název
    The reconstruction of a glacial lake outburst flood using HEC-RAS and its significance for future hazard assessments: an example from Lake 513 in the Cordillera Blanca, Peru
Autor
    Benešová, M.
    Bouška, P.
    Cochachin Rapre, A.
    Klimeš, Jan
    Vilímek, V.
Jazyk
    anglicky
Typ dokumentu
    článek v odborném periodiku
Zdrojový dokument - seriál
    Natural Hazards
Svazek/č.
    Roč. 71, č. 3
Strany
    s. 1617-1638
Rok
    2014
Poznámky
    Projekt: GAP209/11/1000, GA ČR, CZ3cav_un_auth*0273126
    Rozsah: 22 s. : P
Předmětová kategorie
    Cordillera Blanca
    debris flow
    GLOFs
    HEC-RAS
    natural hazard
Klíčové slovo
    513
    Assessments
    Blanca
    Cordillera
    Example
    Flood
    Future
    Glacial
    Hazard
    HEC-RAS
    Lake
    Outburst
    Peru
    Reconstruction
    Significance
    Using
Abstrakt (anglicky)
   In April 2010, an ice/rockfall into Lake 513 triggered a glacial lake outburst flood (GLOF) along the Chucchun River in the Cordillera Blanca of Peru. This paper reconstructs the hydrological characteristics of this as yet undocumented event using a 1D flood model prepared with HEC-RAS. The principle model inputs were obtained during detailed field surveys of surface characteristics and topography within the river and across the adjacent floodplain; a total of 120 cross-sections were surveyed. These inputs were refined further by eyewitness accounts and additional geomorphological observations. The flood modelling has enabled us to constrain the extent of the water surface and its elevation at each cross-section in addition to defining the peak discharge (580 m(3) s(-1)).
   These modelling results show good agreement with other information about the flood including: flood marks and minimum flood levels; the lake displacement wave height; the extent of the flooded area; and the travel time from Lake 513 to the confluence with the Santa River. This demonstrates that the model offers a reliable reconstruction of the basic hydrological characteristics of the GLOF. It provides important information about the flood intensity and significantly improves our ability to model future flood scenarios along both the studied river and within neighbouring catchments. The flood hazard, defined by the flood depth during peak discharge, shows that the majority of the damaged infrastructure (houses, bridges, and a drinking water treatment plant) was only subjected to low or medium flood intensities (defined by a maximum water depth of less than 2 m).
   These low flood intensities help to explain why the flooding caused comparatively minor damage despite the significant public attention it attracted.
Přispěvatel
    AV ČR Brno, Ústav struktury minerálů a hornin
Kód přispěvatele
    AV ČR, ÚSMH
Zdrojový formát
    U
Datum importu
    24. 10. 2014