Analiza trendov evapotranspiracije v Sloveniji

diplomska naloga

Urška Maček (Author), Mojca Šraj (Mentor), Nejc Bezak (Co-mentor)

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.

Keywords

gradbeništvo;diplomska naloga;UNI;VOI;evapotranspiracija;trendi;Mann-Kendallov test;programsko orodje R;

Data

Language:	Slovenian
Year of publishing:	2017
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[U. Maček]
UDC:	551.573:556.13(497.4)(043.2)
COBISS:	8182369
Views:	1190
Downloads:	578
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Analysis of trends in evapotranspiration in Slovenia
Secondary 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.
Secondary keywords:	graduation thesis;evapotranspiration;trends;Mann-Kendall test;R software;
Type (COBISS):	Bachelor thesis/paper
Study programme:	0
Thesis comment:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages:	XIV, 64 str.
ID:	10910824