20.500.12556/DKUM-87204 Termična analiza mrazišč Trnovskega gozda magistrsko delo Thermal analysis of the frosthollow spots of Trnovski gozd Namen magistrskega dela je bil raziskati termične vzorce Trnovskega gozda s posebnim poudarkom na mrazišču Smrekova draga. Mrazišča predstavljajo lokalni klimatski pojav, katerega določa temperaturni obrat. Gre za reliefno depresijo manjših razsežnosti s posebnimi tlemi v katerih se akumulira hladen zrak, kar se pa manifestira tudi na vegetaciji. Pogoje za nastanek mrazišč primarno določa sevalna bilanca, oziroma energijska bilanca Zemlje. Zmožnost radiacijskega ohlajanja oblikuje nizke temperature pri tleh. Takšne razmere so pogojene z letnim časom, nadmorsko višino, tlemi, zaprtostjo reliefa in prevetrenostjo območja. Rezultati temeljijo na terenskem zbiranju podatkov čez vse štiri letne čase v letu 2022/2023. Nekateri podatki so bili zbrani na terenu z brezpilotnim letalnikom, nekaj podatkov pa smo analizirali s pomočjo satelitskih podob Landsat. Ugotavljamo, da so pogoji za nastanek temperaturnega obrata in s tem mrazišča na območju Smrekove drage najbolj ugodni v zimskih in jesenskih mesecih. Takšne ocene smo lahko podali, tako po analizi letnega merjenja temperatur zraka, kakor tudi s strani termičnih satelitskih podob. Tako potrjujemo, da je uporaba Landsat podob, primerna metoda za odkrivanje in spremljanje jezer hladnega zraka in tal, ni pa primeren pristop za natančnejši uvid v termično polje tovrstnih globeli. Na podlagi podatkov merilnih postaj opažamo pozitivno korelacijo med nižanjem temperatur v Smrekovi dragi in vegetacijskim pasom lišajev, ruševja in mahov na dnu. S tem potrjujemo dejstvo, da so najnižje temperature mrazišč na dnu depresije, obenem pa ima na oblikovanje takšnih pogojev vpliv tudi relativna vlaga. Za boljšo analizo temperaturnih vzorcev mrazišč, predlagamo uporabo brezpilotnih letalnikov opremljenih z termično kamero. Na podlagi le te je v mrazišču bilo identificiranih nekaj skalnatih vrzelih, ki omogočajo dotok hladnega zraka iz podzemlja. S analizo temperature tal potrjujemo tudi tezo, da so poleti reliefne kraške depresije lahko tudi toplejše od okolice, čeprav se na mikro-nivoju temperature zraka lahko spustijo do 0 °C. The purpose of the master’s thesis was to investigate the thermal patterns of the Trnovski gozd with a specific emphasis on the Smrekova draga frost hollow. Frost hollows are local climatic phenomena determined by the temperature inversion. They are relief depressions of smaller dimensions with specific soil types where the cold air accumulates and consequently influences the vegetation. The conditions for the formation of frost hollows are primarily determined by the radiation balance, or Earth’s energy balance, and radiative cooling. These factors are conditioned by the time of year, altitude, soil, to what extent the relief is closed and airiness of the area. The results are based on field data collection across all four seasons, from autumn 2022 to the end of summer 2023. Some data was collected in the field with a drone, and some data was analysed using Landsat satellite images. We have found that the conditions for the formation of a temperature inversion and, thus, frost hollows in the area of Smrekova draga are most favourable in the winter and autumn months. We were able to provide such assessments by analysing annual air temperature measurements and thermal satellite imagery. Therefore, we confirm that the Landsat imagery is a suitable method for detecting and monitoring cold air pools but may not be the appropriate approach for gaining a more detailed insight into the thermal patterns of such depressions. Based on the data from the measuring stations, we observe a positive correlation between the decreasing temperatures in Smrekova draga and the vegetation belt of lichens, dwarf pines, and mosses at the bottom. That confirms that the lowest temperatures in frost hollows are at the depression's bottom, and that these conditions are influenced by relative humidity. For a more in-depth analysis of temperature patterns in frost hollows, we recommend using drones equipped with thermal cameras. In the analysis, several rocky crevices were identified in the frost hollow, allowing the inflow of cold air from underground. By analysing the soil temperature, we also confirm the thesis that relief karst depressions can be warmer than the surroundings in summer, even though air temperatures can drop to 0°C on a micro-level. temperaturni obrat mrazišča daljinsko zaznavanje temperatur tal temperature inversion frost hollows remote sensing of temperatures true true false J. Slavič Slovenski jezik Angleški jezik Trnovski gozd (Slovenija ; planota); Magistrsko delo/naloga 2024-03-05 15:34:58 2024-04-15 10:23:58 2024-04-16 03:53:23 0000-00-00 00:00:00 2024 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (VII, 88 str.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 911.2(497.4)(043.2) 192484867 MAG_Slavic_Jakob_2024.pdf MAG_Slavic_Jakob_2024.pdf 1 CC85DAD7C68877DF8F18B11B8DC87857 4c837875221ad500dd365615c73af1de36a72767362c4ec740dcb41cc0735e15 574c39a5-db1d-11ee-ace8-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=176577 Filozofska fakulteta 0 0 0