Analiza ohlajanja zraka v manjšem mrazišču

Pazlar, Ahac (author), Skok, Gregor (mentor)

Mrazišče je definirano kot manjše območje, navadno v vrtači ali kaki drugačni kotlini, v katerem je temperatura pogosto nižja kot v okolici. V tem delu opisujem potek izvajanja meritev in analizo ohlajanja v manjšem mrazišču, katerega horizontalna dimenzija je 70 m in vertikalna 9 m. Meritve sem izvajal v obdobju od 29. 7. 2019 in do 21. 8. 2019. Ugotovil sem, da je temperatura v mrazišču lahko nižja od okolice za več kot 5°C. Jezero hladnega zraka je v mrazišču precej stabilno in ga vetrovi, ki so šibkejši kot 1 m/s ne morejo premešati. Tako šibki vetrovi ne morejo preprečiti nastanka temperaturnih razlik med mraziščem in okolico. Vendar pa lahko, še zlasti v kombinaciji s sunki vetra, zelo motijo potek ohlajanja v mrazišču. Razlika med temperaturo v in izven mrazišča, v poletnih mesecih najhitreje narašča okrog 18:00. Poleg popoldanskega intenzivnega ohlajanja se to nadaljuje v večer. Iz meritev se tudi vidi, da se po polnoči temperatura v mrazišču praviloma ne zniža za več kot 5°C.

• Language: Slovenian
• Keywords: mrazišča, temperaturni obrat, meteorologija, temperatura zraka, meritve
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FMF - Faculty of Mathematics and Physics
• Year: 2019
• PID: 20.500.12556/RUL-111287
• COBISS.SI-ID: 384681
• Publication date in RUL: 27.09.2019

Secondary language

• Language: English
• Title: Analysis of cooling in small sinkhole

Abstract

As a part of this thesis, measurements were performed in a small sinkhole, which has a horizontal dimension of 70 m and is 9 m deep. The measurements were performed in the period of the 29th of July to the 22nd of August 2019. The analysis shows, that the temperature in the sinkhole can be lower than in the surrounding area for more than 5°C. A cold-air pool in a sinkhole is pretty stable, so the winds that are weaker than 1 m/s cannot mix the air in the cold-air pool with the air above. Such weak winds cannot prevent the occurrence of temperature differences between the sinkhole and the surrounding area. However, especially in combination with wind gusts, they can disrupt the process of cooling in the sinkhole. The difference between the temperature inside and outside of the sinkhole, increases the most around 6 p.m. The intensive cooling continues into the evening. The measurements show, that after midnight the temperature usually does not decrease for more than 5°C.

• Keywords: sinkhole, temperature inversion, meteorology, air temperature, measurements