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Origin and evolution of proglacial lakes in the Patagonian Andes
Danišová, Dominika ; Vilímek, Vít (advisor) ; Šobr, Miroslav (referee)
Origin and evolution of proglacial lakes in the Patagonian Andes ABSTRACT: Proglacial lakes are dynamic water bodies affected by the evolution of glacier ice masses, morphology and climatic factors. Mountain glaciers are very sensitive to climate change, which has caused their continuous recession recent decades. Glacier retreat is closely linked to an increase in the volume of proglacial lakes, especially in high mountain areas. The growth of proglacial lakes can also lead to increased probability of overtopping or dam rupture, also known as GLOF. The first aims of the presented thesis are to describe how proglacial lakes are formed, what factors can influence their continuous evolution and, lastly, how the lakes can affect their surroundings. In order to perform the spatial and temporary analysis, an inventory of the proglacial lakes in the North Patagonian Icefield was made, as this area has not yet been properly studied. In the time scale from 1984 till now, 640 lakes were characterised. The results show that along with glacier retreat, proglacial lakes are increasing in both size and number. However, the correlation with the climatic data is limited because of its poor quality and inadequate distribution in this area. Keywords: glacial lakes, glaciers, lake-dams, North Patagonian Icefield, GLOF
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Evolution of proglacial lakes in the South Patagonian Icefield
Schreiner, Vojtěch ; Vilímek, Vít (advisor) ; Šobr, Miroslav (referee)
Today, as our planet warms, the dangers posed by proglacial lakes are becoming increasingly apparent. Often, due to faster glacial retreat, these lakes are enlarged and the risk of lake dam failure is consequently increased. This can lead to a phenomenon known as GLOF (Glacial Lake Outburst Flood), i.e. the breaching or overflowing of a lake dam and subsequent flooding of downstream areas. The key to limiting the damage caused by these events is to increase our knowledge of this phenomenon and to be able to anticipate these events in time. The basis for this must be an analysis of glacial lakes in the area. This should include a time element, which will allow us to keep track of changes in the amount of water retained in the lake. This is the focus of this paper. The South Patagonian Icefield was chosen as the research area and proglacial lakes were mapped from images taken in 1985 which are available on Google Earth Pro. In this way, 93 lakes were found and their evolution was followed up to the present day. From these observations an inventory table with spatial and temporal elements was created. It was confirmed that most of the proglacial lakes in this region are also experiencing an increase in area.
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Origin and evolution of proglacial lakes in the Patagonian Andes
Danišová, Dominika ; Vilímek, Vít (advisor) ; Šobr, Miroslav (referee)
Origin and evolution of proglacial lakes in the Patagonian Andes ABSTRACT: Proglacial lakes are dynamic water bodies affected by the evolution of glacier ice masses, morphology and climatic factors. Mountain glaciers are very sensitive to climate change, which has caused their continuous recession recent decades. Glacier retreat is closely linked to an increase in the volume of proglacial lakes, especially in high mountain areas. The growth of proglacial lakes can also lead to increased probability of overtopping or dam rupture, also known as GLOF. The first aims of the presented thesis are to describe how proglacial lakes are formed, what factors can influence their continuous evolution and, lastly, how the lakes can affect their surroundings. In order to perform the spatial and temporary analysis, an inventory of the proglacial lakes in the North Patagonian Icefield was made, as this area has not yet been properly studied. In the time scale from 1984 till now, 640 lakes were characterised. The results show that along with glacier retreat, proglacial lakes are increasing in both size and number. However, the correlation with the climatic data is limited because of its poor quality and inadequate distribution in this area. Keywords: glacial lakes, glaciers, lake-dams, North Patagonian Icefield, GLOF
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The analysis of moraine-dammed lake destructions
Emmer, Adam ; Vilímek, Vít (advisor) ; Klimeš, Jan (referee)
Analysis of moraine-dammed lake destructions ABSTRACT: Floods from moraine-dammed lakes represent significant threat for inhabitants of high-mountain areas all over the world. There are eight main causes of lake destructions and about twenty consequent failure mechanisms. Based on research of scientific literature, this thesis aims at creating an analysis of the above mentioned causes. Contemporary methods of potentionally dangerous lakes recognizing, approaches to hazard assessment and flash flood prevention and mitigation meassures are mentioned as well. In the analytical part, differences / similarities of the particular causes are studied as well as the chronological aspect of these events in the Northamerican Cordillera, Central Asia and Cordillera Blanca. Keywords: moraine-dammed lakes; GLOF; high mountain areas
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