Počet záznamů: 1
Reconstruction of the 1941 GLOF process chain at Lake Palcacocha (Cordillera Blanca, Peru)
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SYSNO ASEP 0523907 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Reconstruction of the 1941 GLOF process chain at Lake Palcacocha (Cordillera Blanca, Peru) Tvůrce(i) Mergili, M. (AT)
Pudasaini, S. P. (AT)
Emmer, Adam (UEK-B) ORCID, RID, SAI
Fischer, J.-T. (AT)
Cochachin, A. (PE)
Frey, H. (CH)Celkový počet autorů 6 Zdroj.dok. Hydrology and Earth System Sciences. - : Copernicus - ISSN 1027-5606
Roč. 24, č. 1 (2020), s. 93-114Poč.str. 22 s. Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova moraine-dammed lakes ; high-mountain lakes ; outburst floods ; glacial lakes ; avalanche ; impact ; hazards ; debris ; uncertainty ; model Vědní obor RIV DB - Geologie a mineralogie Obor OECD Water resources CEP LO1415 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Open access Institucionální podpora UEK-B - RVO:86652079 UT WOS 000506835900001 EID SCOPUS 85077822472 DOI 10.5194/hess-24-93-2020 Anotace The Cordillera Blanca in Peru has been the scene of rapid deglaciation for many decades. One of numerous lakes formed in the front of the retreating glaciers is the moraine-dammed Lake Palcacocha, which drained suddenly due to an unknown cause in 1941. The resulting Glacial Lake Outburst Flood (GLOF) led to dam failure and complete drainage of Lake Jircacocha downstream, and to major destruction and thousands of fatalities in the city of Huaraz at a distance of 23 km. We chose an integrated approach to revisit the 1941 event in terms of topographic reconstruction and numerical back-calculation with the GIS-based open-source mass flow/process chain simulation framework r.avaflow, which builds on an enhanced version of the Pudasaini (2012) two-phase flow model. Thereby we consider four scenarios: (A) and (AX) breach of the moraine dam of Lake Palcacocha due to retrogressive erosion, assuming two different fluid characteristics, (B) failure of the moraine dam caused by the impact of a landslide on the lake, and (C) geomechanical failure and collapse of the moraine dam. The simulations largely yield empirically adequate results with physically plausible parameters, taking the documentation of the 1941 event and previous calculations of future scenarios as reference. Most simulation scenarios indicate travel times between 36 and 70 min to reach Huaraz, accompanied with peak discharges above 10 000 m(3)s(-1). The results of the scenarios indicate that the most likely initiation mechanism would be retrogressive erosion, possibly triggered by a minor impact wave and/or facilitated by a weak stability condition of the moraine dam. However, the involvement of Lake Jircacocha disguises part of the signal of process initiation farther downstream. Predictive simulations of possible future events have to be based on a larger set of back-calculated GLOF process chains, taking into account the expected parameter uncertainties and appropriate strategies to deal with critical threshold effects. Pracoviště Ústav výzkumu globální změny Kontakt Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Rok sběru 2021 Elektronická adresa https://www.hydrol-earth-syst-sci.net/24/93/2020/
Počet záznamů: 1