Hidrológiai Közlöny, 2014 (94. évfolyam)

2014 / 4. szám - Kiss Melinda - Torma Péter: Sekély tavi energiaáramok fluxus-gradiens eljárás-alapú becslése örvény-kovariancia mérésekből

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HIDROLÓGIAI KÖZLÖNY 2014. 94. ÉVF. 4. SZ.

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KISS MELINDA

JÓZSA JÁNOS

TORMA PÉTER

tudományos munkatárs, Budapesti Műszaki és Gazdaságtudományi Egyetem, Vízépítési és Vízgazdálkodási Tanszék, e-mail: kiss.melinda@epito.bme.hu tanszékvezető egyetemi tanár, Budapesti Műszaki és Gazdaságtudományi Egyetem, Vízépítési és Vízgazdálkodási Tanszék, e- mail: iozsa.ianos@epito.bme.hu tanársegéd, Budapesti Műszaki és Gazdaságtudományi Egyetem, Vízépítési és Vízgazdálkodási Tanszék, e-mail: torma.peter@epito.bme.hu

The Eddy-Covariance technique based estimation of the energy budget of Lake Fertő Kiss, M. - Józsa, J.

Flux-gradient based estimation of the turbulent energy flux of shallow lakes from Eddy- Covariance measurements Kiss, M. - Torma, P.

Abstract to the two articles: The understanding of the energy budget of shallow lakes is crucial to explain the basic processes (such as temperature stratification, evaporation) of the lake, furthermore, to support the water management planning tasks (e g. sluice-regulation and water supply). In this research, a measurement and data processing methodology was introduced which allows the evaluation of the water budget components, among others the sensible and latent heat flux, and the evaporation estimation from the latter.

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A kézirat beérkezett: 2014. November 12-én

Detailed micrometeorological measurements have been conducted including an Eddy-Covariance system at the interface of the reed and open water zones in Lake Fertő (chosen as case study). The energy budget components were determined and their sensitivity was analysed. Significant differences were found between the diurnal and seasonal course of the energy budget terms of the reed and open water zones, especially in case of the latent heat flux and storage term. An energy balance closure of 73% was obtained with slight dependence on the corrections of the eddy-covariance theory and with significant dependence on the thermal stratification and the homogeneity of the measurement area.

Since the contribution of the measured heat fluxes to each of the two characteristic zones depends on the wind direction, the fluxes of the mean quantities were estimated separately above the two zones by means of the flux-gradient method. Finally, the evaporation rate of the reed and open water zone was estimated individually and was compared to the results of a number of evaporation estimation methods. According to our findings, in the summer months, the evaporation of the reed zone significantly exceeded the one of the open water zone, while in May and in the autumn months, the monthly evaporation of the two zones was nearly equal.

The present two related papers introduce the theoretical background of the energy budget, Eddy-Covariance technique and flux-gradient method and present the developed measurement and data processing methodology in details which was proven by the results to be adequate to quantify the energy budget of shallow lakes.

Keywords: Eddy-Covariance, flux-gradient, evaporation, Monin- Obukhov, reed, open water zones, exchange