Primerjava različnih metod izračuan evapotranspiracije

Povzetek

Ključne besede

Podatki

Jezik:	Slovenski jezik
Leto izida:	2011
Izvor:	Ljubljana
Tipologija:	2.11 - Diplomsko delo
Organizacija:	UL FGG - Fakulteta za gradbeništvo in geodezijo
Založnik:	[P. Cesar]
UDK:	556.13(043.2)
COBISS:	5355617
Št. ogledov:	2074
Št. prenosov:	454
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Comparison of different methods for calculating evapotranspiration
Sekundarni povzetek:	Evpotranspiration is one of the most important factors in the hydrological cycle. As a term it represents two separate processes, evaporation and transpiration. as a proces both occur at the same time and it is not easy to distinguish them. Evapotranspiration consists of three main factors, the impact of meteorological factors (solar radiation, air temperature, air humidity and wind speed), plant factor and environmental conditions, which are described in the first part of the thesis, which also includes an overview of the most common methods of calculation (temperature, radiation and combined) reference evapotranspiration and a description of the instruments for the measurement of actual evapotranspiration. In the practical part the results calculated using the six methods (Thorntwaith, Makkink, Turc, FAO Penman-Monteith, Priestley-Taylor and Hargreaves) for four meteorological stations (Ljubljana, Murska Sobota, Portorož, Kredarica) are shown. The comparison between them is also included. Comparison between different equations with the standard FAO Penman-Monteith equation pointed out that the Turcs equation is the best match with approximately 13 % lower values and the Priestley-Taylor method with approximately 18 % higher values. The analyses of individual variables indicated that evapotranspiration at all locations depended mostly upon the energy of solar radiation, temperature and humidity. It was found that the wind in FAO Penman-Monteith equation has the minimum impact. Even though, the wind was statistically significant in most cases.
Sekundarne ključne besede:	graduation thesis;evpotranspiration;evaporation;influence factors;measuring of evaporation;Penman-Monteith;Thorntwaith;Hargreaves;Priestley-Taylor;Makkink;Turc;
Vrsta datoteke:	application/pdf
Vrsta dela (COBISS):	Diplomsko delo
Komentar na gradivo:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Strani:	XVI, 133 str.
Vrsta dela (ePrints):	thesis
Naslov (ePrints):	Comparison of different methods for calculating evapotranspiration
Ključne besede (ePrints):	evapotranspiracija;izhlapevanje;merjenje izhlapevanja;Penman-Monteith;Thorntwaith;Hargreaves;Priestley-Taylor;Makkink;Turc
Ključne besede (ePrints, sekundarni jezik):	evapotranspiration;evaporation;influence factors;measuring of evaporation;Penman-Monteith;Thorntwaith;Hargreaves;Priestley-Taylor;Makkink;Turc
Povzetek (ePrints):	Evapotranspiracija predstavlja enega izmed pomembnejših dejavnikov v hidrološkem krogu. Kot pojem predstavlja dva ločena procesa in sicer izhlapevanje in transpiracijo, kot proces pa sta oba pojma med seboj združena, saj potekata istočasno in ju je med seboj težko ločiti. Evapotranspiracija ima tri glavne faktorje vpliva in sicer meteorološke faktorje (sončno sevanje, temperatura zraka, vlaga v zraku in hitrost vetra), faktor rastline in okoljske pogoje, ki so podrobneje opisani v prvem delu naloge. V nadaljevanju je narejen pregled najbolj pogostih metod izračuna (temperaturne, radiacijske in kombinirane) referenčne evapotranspiracije in opis instrumentov za merjenje dejanske evapotranspiracije. V praktičnem delu naloge so prikazani rezultati izračuna s pomočjo šestih metod (Thorntwaithova, Makkinkova, Turcova, FAO Penman-Monteithova, Priestley-Taylorjeva in Hargreavesova) za štiri meteorološke postaje (Ljubljana, Murska Sobota, Portorož, Kredarica) ter primerjava med njimi. Primerjava posameznih enačb s standardno FAO Penman-Monteithovo enačbo je pokazala, da se z omenjeno enačbo najbolj ujemata Turcova metoda s približno 13 % nižjimi vrednostmi in Priestley-Taylorjeva metoda s približno 18 % višjimi vrednostmi. Z analizo vpliva posameznih spremenljivk je bilo ugotovljeno, da je na vseh lokacijah evapotranspiracija v največji meri odvisna od energije sončnega sevanja, temperature in vlažnosti. Ugotovljeno je bilo, da veter v enačbi Penman-Monteitha predstavlja najmanjši vpliv. Kljub vsemu pa je tudi ta v večini primerov statistično značilen.
Povzetek (ePrints, sekundarni jezik):	Evpotranspiration is one of the most important factors in the hydrological cycle. As a term it represents two separate processes, evaporation and transpiration. as a proces both occur at the same time and it is not easy to distinguish them. Evapotranspiration consists of three main factors, the impact of meteorological factors (solar radiation, air temperature, air humidity and wind speed), plant factor and environmental conditions, which are described in the first part of the thesis, which also includes an overview of the most common methods of calculation (temperature, radiation and combined) reference evapotranspiration and a description of the instruments for the measurement of actual evapotranspiration. In the practical part the results calculated using the six methods (Thorntwaith, Makkink, Turc, FAO Penman-Monteith, Priestley-Taylor and Hargreaves) for four meteorological stations (Ljubljana, Murska Sobota, Portorož, Kredarica) are shown. The comparison between them is also included. Comparison between different equations with the standard FAO Penman-Monteith equation pointed out that the Turcs equation is the best match with approximately 13 % lower values and the Priestley-Taylor method with approximately 18 % higher values. The analyses of individual variables indicated that evapotranspiration at all locations depended mostly upon the energy of solar radiation, temperature and humidity. It was found that the wind in FAO Penman-Monteith equation has the minimum impact. Even though, the wind was statistically significant in most cases.
Ključne besede (ePrints, sekundarni jezik):	evapotranspiration;evaporation;influence factors;measuring of evaporation;Penman-Monteith;Thorntwaith;Hargreaves;Priestley-Taylor;Makkink;Turc
ID:	8312012