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Analiza trendov evapotranspiracije v Sloveniji : diplomska naloga
Maček, Urška (Author), Šraj, Mojca (Mentor) More about this mentor... This link opens in a new window, Bezak, Nejc (Co-mentor)

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Abstract
Spremljanje in analiziranje trendov evapotranspiracije igra pomembno vlogo pri razumevanju in analizah hidrološkega kroga ter dinamiki procesov, ki definirajo ta krog. Višanje evapotranspiracije vodi v manjše količine razpoložljive vode, tako za človeške dejavnosti (npr. pitna voda, namakanje) kot tudi za naravne procese. V diplomski nalogi je izračunana vrednost trendov v podatkih o evapotranspiraciji na območju Slovenije v 55-letnem obdobju (1961–2016). Analiza trendov referenčne evapotranspiracije, izračunane po standardni FAO Penman-Monteithovi enačbi, je narejena za 18 meteoroloških postaj s pomočjo programskega orodja R. Za izbrane postaje smo naredili tudi Mann-Kendallove teste trendov na osnovi dnevnih vrednosti evapotranspiracije, mesečnih in letnih maksimalnih vrednosti evapotranspiracije ter letnih vsot evapotranspiracije. Rezultati analize trendov kažejo, da imajo postaje v zmernocelinskem podnebju v večini statistično značilno ali neznačilno naraščajoč trend. Letne vsote evapotranspiracije se prav tako pri več kot polovici obravnavanih postaj višajo, kar nakazuje trend povečanega izhlapevanja v Sloveniji. Na različne vrednosti evapotranspiracije in dobljene rezultate močno vpliva tudi naravnogeografska pestrost Slovenije. Nadalje je narejena analiza vplivov štirih spremenljivk na referenčno evapotranspiracijo z uporabo linearne korelacije. Pokazala je, da ima največji vpliv na evapotranspiracijo na posameznih postajah povprečna dnevna temperatura, sledijo ji trajanje sončnega sevanja, povprečna relativna vlaga in povprečna hitrost vetra.

Language:Slovenian
Keywords:evapotranspiracija, trendi, Mann-Kendallov test, programsko orodje R
Work type:Bachelor thesis/paper (mb11)
Tipology:2.11 - Undergraduate Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2017
Publisher:[U. Maček]
UDC:551.573:556.13(497.4)(043.2)
COBISS.SI-ID:8182369 Link is opened in a new window
Views:546
Downloads:358
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Secondary language

Language:English
Title:Analysis of trends in evapotranspiration in Slovenia : Graduation thesis
Abstract:
Following and analysing trends in evapotranspiration plays important role in understanding and analysing hydrological cycle and processes dynamics, which define this cycle. Increasing of evapotranspiration leads to lower amount of available water for human activities (such as drinking water, irrigation) and natural processes. In thesis trends in evapotranspiration data in Slovenia are calculated for 55-year period (1961–2016). Analysis of reference evapotranspiration in Slovenia, calculated by the standard FAO Penman-Monteith equation, is made for 18 meteorological stations using R software. Mann-Kendall test of trends for chosen station was made on the basis of the daily values of evapotranspiration, monthly and annual maximum values and annual sums of evapotranspiration. The results of analysis indicate that the majority of the stations in moderate continental climate have statistically significant or insignificant positive trend. Furthermore, the annual sums of evapotranspiration are also increasing for more than a half of the considered stations, which indicates that trends of evaporation in Slovenia are increasing. Additionally, natural geographic variety of Slovenia has major impact on diverse values of evapotranspiration. Analysis of the influence of four variables on reference evapotranspiration is conducted using linear correlation. Analysis shows that the most influential variable of individual station is average air temperature, followed by solar radiation, average relative humidity and average wind speed.

Keywords:evapotranspiration, trends, Mann-Kendall test, R software

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