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Spatiotemporal patterns of high-mountain lakes and related hazards in western Austria
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SYSNO ASEP 0453799 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Spatiotemporal patterns of high-mountain lakes and related hazards in western Austria Tvůrce(i) Emmer, Adam (UEK-B) ORCID, RID, SAI
Merkl, S. (AT)
Mergili, M. (AT)Zdroj.dok. Geomorphology. - : Elsevier - ISSN 0169-555X
Roč. 246, oct (2015), s. 602-616Poč.str. 15 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova lake development ; geoenvironmental change ; GLOF ; high-mountain lakes ; susceptibility analysis Vědní obor RIV DE - Zemský magnetismus, geodézie, geografie Institucionální podpora RVO:67179843 - RVO:67179843 UT WOS 000360869400048 EID SCOPUS 84937788104 DOI 10.1016/j.geomorph.2015.06.032 Anotace Climate-induced environmental changes are triggering the dynamic evolution of high-mountain lakes worldwide, a phenomenon that has to be monitored in terms of lake outburst hazards.We analyzed the spatial distribution and recent temporal development of high-mountain lakes in a study area of 6139 km2, covering the central European Alps (Tyrol). We identified 1024 lakes. While eight lakes are ice-dammed, one-third of all lakes are located in the immediate vicinity of recent glacier tongues, half of them impounded by moraines, half by bedrock. Two-thirds of all lakes are apparently related to LIA or earlier glaciations. One landslide-dammed lake was identified in the study area. The evolution of nine selected (pro)glacial lakeswas analyzed in detail, usingmultitemporal remotely sensed images and field reconnaissance. Considerable glacier retreat led to significant lake growth at four localities, two lakes experienced stagnant or slightly negative areal trends, one lake experienced a more significant negative areal trend, and two lakes drained completely during the investigation period. We further (i) analyzed the susceptibility of selected lakes to glacial lake outburst floods (GLOFs), using two different methods; (ii) identified potential triggers and mechanisms of GLOFs; (iii) calculated possible flood magnitudes for predefined flood scenarios for a subset of the lakes; and (iv) delineated potentially impacted areas. We distinguished three phases of development of bedrock-dammed lakes: (a) a proglacial, (b) a glacierdetached, and (c) a nonglacial phase. The dynamics — and also the susceptibility of a lake to GLOFs — decrease substantially from (a) to (c). Lakes in the stages (a) and (b) are less prominent in our study area, compared to other glacierized high-mountain regions, leading us to the conclusion that (i) the current threat to the population by GLOFs is lower but (ii) the future development of emerging lakes has to be monitored carefully. Pracoviště Ústav výzkumu globální změny Kontakt Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Rok sběru 2016
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