2022. augusztus 10. szerda
IDŐJÁRÁS - OMSZ angol nyelvű folyóirat

Vol. 122, No. 1 * Pages 1–99 * Januar - March 2018

Quarterly Journal of the Hungarian Meteorological Service

Special Issue: Meteorological aspects of water management

letöltés [pdf: 2680 KB]
Estimation of natural water body’s evaporation based on Class A pan measurements in comparison to reference evapotranspiration
Angéla Anda, Brigitta Simon, Gábor Soós, and Tamás Kucserka
DOI:10.28974/idojaras.2018.1.4 (p. 41–)
 PDF (1227 KB)   |   Abstract


A Class A pan (C) evaporation (Ep) study was conducted at the Agrometeorological Research Station of Keszthely, in the growing season of 2016. Some of the evaporation pans were implemented with freshwater aquatic macrophytes (Myriophyllum sp., Potamogeton sp.,and Najas sp.) (Ps) and sediment covered bottom (S). The applied macrophytes were the predominant species of Keszthely Bay (Balaton Lake). Reference (Eo) afterShuttleworthand reference evapotranspiration (ETo) after Penman-Monteith (FAO-56 formula) were also included for the E study. Of pre-selected four investigated variables, air temperature and air humidity impacted Ep of treated Class A pans the most. Cumulative Ep values for 2016 were 363.1, 427.7, and 461.5 mm in C, S, and Ps, respectively. There was no difference in measured cumulative Ep of Ps (461.5 mm) and computed ETo (472.1 mm) during the studied season.
On the basis of a simplified water budget, E rate of Keszthely Bay increased with 16.9%, when macrophytes and sediment cover were accounted. It is equivalent to 264,000,000 m3 water in Keszthely Bay’s E estimation. Simple E approach - when lake’s components, such as submerged macrophytes and sediment cover were also accounted - could extend the accuracy of natural lake’s E estimation in a broader circle than earlier.

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