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Structure of non-active sorted patterned ground in the Giant Mts.
Uxa, Tomáš ; Křížek, Marek (advisor) ; Treml, Václav (referee)
Sorted patterned ground are a group of periglacial microforms which create more or less symmetrical forms due to frost action and especially repeated freeze-thaw cycles. The origin of sorted patterned ground in the Giant Mts. is presumed in late Pleistocene and they are suggested to be recently inactive (with the exception of sorted circles). Their occurrence is linked to the topmost localities with flat surfaces and intense wind action which causes low snow cover and allow deep soil freezing. The submitted diploma thesis deals with the influence of site characteristics (such as microclimatic extremity, terrain morphology and lithology) on morphology and sorting degree of sorted patterned ground. Field research was carried out along a transect tracing the microclimatic extremity gradient (represented by altitude and so-called relative snow height) in area of Mt. Luční hora in the eastern part of the Giant Mts. which in relatively homogeneous from the viewpoint of lithology and wind exposure. The transect was further extended across the Modré sedlo Saddle to the Mt. Studniční hora where there also occur various types of fossil sorted patterned ground or quasi- active sorted circles in the Modré sedlo Saddle, respectively. However, there is a variability of lithological as well as altitude...
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Thermal regime of moraine cover in the Adygene valley, Kyrgyz Range
Martinásková, Daša ; Engel, Zbyněk (advisor) ; Uxa, Tomáš (referee)
Submitted Bachelor thesis is focused on thermal regime of the morain covering, which is one of the main indicators of the extension in periglacial and glacial zone in the mountain environment. Introductory part is concluded from themed literature and is primarily focused on the characteristics of the thermal regime of sediments and their relationship to the boundaries of the mountain permafrost, position of equilibrium snow line and temperature-based mountain glaciers. The following sections of this work are describing physical and geographic conditions of the valley of Adygine in Kyrgyz Range area (northern Tien-Shan) as well as the methodologhy of the used work The main part of this document is the evaluation of measured temperature in the morain cover in the area of interest. At first from general point of view, then in terms of freeze-thaw characteristics and finally relate these findings to the local conditions of the glaciál environment. According to the measured results, is it clear that there are many factors influencing the soil temperature regime. Among the most fundamental, the most important include air temperature, local circulation conditions, snow cover and local habitat conditions. Knowledge gained from the practical part shows that the measurement localitions are characterized by...
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Structure of non-active sorted patterned ground in the Giant Mts.
Uxa, Tomáš
Sorted patterned ground are a group of periglacial microforms which create more or less symmetrical forms due to frost action and especially repeated freeze-thaw cycles. The origin of sorted patterned ground in the Giant Mts. is presumed in late Pleistocene and they are suggested to be recently inactive (with the exception of sorted circles). Their occurrence is linked to the topmost localities with flat surfaces and intense wind action which causes low snow cover and allow deep soil freezing. The submitted diploma thesis deals with the influence of site characteristics (such as microclimatic extremity, terrain morphology and lithology) on morphology and sorting degree of sorted patterned ground. Field research was carried out along a transect tracing the microclimatic extremity gradient (represented by altitude and so-called relative snow height) in area of Mt. Luční hora in the eastern part of the Giant Mts. which in relatively homogeneous from the viewpoint of lithology and wind exposure. The transect was further extended across the Modré sedlo Saddle to the Mt. Studniční hora where there also occur various types of fossil sorted patterned ground or quasi- active sorted circles in the Modré sedlo Saddle, respectively. However, there is a variability of lithological as well as altitude...
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Past and Present Permafrost and Active-Layer Phenomena as Indicators of Late Quaternary Environmental Changes
Uxa, Tomáš ; Křížek, Marek (advisor) ; Dobiński, Wojciech (referee) ; Winkler, Stefan (referee)
Late Quaternary has seen numerous major permafrost expansions and retreats associated with alternating glacial and interglacial periods as well as stadials and interstadials, the research of which is necessary to understand the past environmental evolution, but also provides useful analogues for its present-day and future behaviour. How- ever, observations of permafrost and active-layer phenomena are still limited, and sometimes misleading, even in many present-day permafrost regions, and naturally less comprehensive evidence is available from areas where permafrost existed in the past. The thesis provides comprehensive information on the distribution and morphology of mostly relict patterned ground and rock glaciers in the High Sudetes Mts. and in the Western and High Tatra Mts., respectively, which are the most widespread permafrost features that occur in these Central European mountain ranges situated north of the Alps. It shows that the landforms are closely related to increased severity of climates and/or sparser vegetation at higher elevations and as such they attest to the environmental conditions, which prevailed there towards the end of the Last Glacial Period to the early Holocene, but also to their current states. Similar elevation trends in the pattern morphology are also documented for...
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Snow avalanche modelling
Racek, Ondřej ; Blahůt, Jan (advisor) ; Uxa, Tomáš (referee)
Modelling of dynamic processes in physical geography is really quickly developing discipline. This trend is noticeable in case of snow avalanche modelling too. Following bachelor thesis is mapping snow avalanche modells and describes theirs basic principes. In the aplication part is thesis focused on use RAMMS numerical avalanche model. Experimentally verifies suitabiliti of friction coeficients for use in condicions prevailing in the Giant Mountains (Krkonoše). Friction coeficients was experimentaly stated in the Swiss Alps and tabooed in user manual. Results of RAMMS avalanche model are based on a combinaton of 36 values of friction coeficients. These results of numerical models are compared with real avalanche from 10. 2. 2015. Between real avalanche and modeled avalanche is compared run- out and area of acumulation. Friction coeficients asumed in Swiss Alps can be used for modelling avalanches in Giant Mountains. For correct dessignation of friction parameters is appropriately use run out. Results of modells strongly overvalue area of acumulation. Abstrakt Modelování fyzickogeografických procesů je dynamicky rozvíjející se obor, tudíž stejný trend sledujeme v případě modelování sněhových lavin. Tato bakalářská práce modely sněhových lavin mapuje a popisuje jejich základní principy. V aplikační...
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Structure of non-active sorted patterned ground in the Giant Mts.
Uxa, Tomáš ; Křížek, Marek (advisor) ; Treml, Václav (referee)
Sorted patterned ground are a group of periglacial microforms which create more or less symmetrical forms due to frost action and especially repeated freeze-thaw cycles. The origin of sorted patterned ground in the Giant Mts. is presumed in late Pleistocene and they are suggested to be recently inactive (with the exception of sorted circles). Their occurrence is linked to the topmost localities with flat surfaces and intense wind action which causes low snow cover and allow deep soil freezing. The submitted diploma thesis deals with the influence of site characteristics (such as microclimatic extremity, terrain morphology and lithology) on morphology and sorting degree of sorted patterned ground. Field research was carried out along a transect tracing the microclimatic extremity gradient (represented by altitude and so-called relative snow height) in area of Mt. Luční hora in the eastern part of the Giant Mts. which in relatively homogeneous from the viewpoint of lithology and wind exposure. The transect was further extended across the Modré sedlo Saddle to the Mt. Studniční hora where there also occur various types of fossil sorted patterned ground or quasi- active sorted circles in the Modré sedlo Saddle, respectively. However, there is a variability of lithological as well as altitude...
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Thermal regime of moraine cover in the Adygene valley, Kyrgyz Range
Martinásková, Daša ; Engel, Zbyněk (advisor) ; Uxa, Tomáš (referee)
Submitted Bachelor thesis is focused on thermal regime of the morain covering, which is one of the main indicators of the extension in periglacial and glacial zone in the mountain environment. Introductory part is concluded from themed literature and is primarily focused on the characteristics of the thermal regime of sediments and their relationship to the boundaries of the mountain permafrost, position of equilibrium snow line and temperature-based mountain glaciers. The following sections of this work are describing physical and geographic conditions of the valley of Adygine in Kyrgyz Range area (northern Tien-Shan) as well as the methodologhy of the used work The main part of this document is the evaluation of measured temperature in the morain cover in the area of interest. At first from general point of view, then in terms of freeze-thaw characteristics and finally relate these findings to the local conditions of the glaciál environment. According to the measured results, is it clear that there are many factors influencing the soil temperature regime. Among the most fundamental, the most important include air temperature, local circulation conditions, snow cover and local habitat conditions. Knowledge gained from the practical part shows that the measurement localitions are characterized by...
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Thermal regime of moraine cover in the Adygene valley, Kyrgyz Range
Martinásková, Daša ; Engel, Zbyněk (advisor) ; Uxa, Tomáš (referee)
The focus of this bachelor thesis is the thermal regime of the morain covering in the valley of river Adygine in Kyrgyz Range area in the northern Tien-Shan. The intention of this thesis is to evaluate the temperature measurements from the glacis zone of the Adygine glacier and to explicate the results with regards to the continuance of recent permanent snow line and permafrost area. In the area of interest, with altitude 3498 to 3659 m, two air temperature sensor and five thermistors with MINIKIN dataloggers were installed. The thermistors measure temperature in 15 and 30 cm depths below the surface of glacial accumulations. The surface layer of morains melts annually for three or five months, mean annuall ground temperature did not drop below -2řC and area of measurements is distinguished with weak freeze-thaw activity. The mean annual air temperature in year 2011 was -4,5 in 3653 m and -6,1řC in 3913 m altitude respectively. The comparsion of measured data with publicated average permafrost temperature data in nearby ranges of Tan-San mountains suggests, that area of interest is located in discontinuous mountain permafrost area. Zero isothermic line is located in approximately 2900m altitude. This is lower than the mountain permafrost level and so the base of glaciál forefront can be denoted as...
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