Testing different approximations of soil heat flux under mountain meadow conditions

0585144 - ÚH 2025 CZ eng A - Abstract
Mazúchová, R. - Dohnal, M. - Tesař, Miroslav - Votrubová, J. - Vogel, T.
Testing different approximations of soil heat flux under mountain meadow conditions.
6th International Symposium of Soil Physics - Book of Abstracts. Praha: Czech University of Life Sciences Prague, 2024. s. 29-29. ISBN 978-80-213-3355-0.
[International Symposium of Soil Physics /6./. 06.02.2024-07.02.2024, Praha]
Institutional support: RVO:67985874
Keywords : soil heat flux * transfer of energy * solar radiation * HUKSEFLUX
OECD category: Hydrology
https://czuni.cz/wp-content/uploads/2023/12/6th-ISSP-Book-of-Abstracts_Final_complet_web.pdf

The soil heat flux, the transfer of energy between the soil and the atmosphere, is part of the surface energy balance and plays an essential role in evapotranspiration. To measure heat flux into the soil, a pair of HFP01 sensors (Hukseflux Thermal Sensors B.V) has been available in the Liz catchment (average altitude 941 a. s .l., precipitation average 861 mm, average air temperature 6.3 °C) since 2012. Soil heat flux approximation methods were tested on three hydrologically distinct vegetation seasons - average, below average and above average. The assumption of zero heat flux to the soil at the diurnal step is not correct under our geographic conditions for most of the vegetation season. On the other hand, the error due to this approach is not very large in the calculation of evapotranspiration. The hourly soil heat flux approximated as part of net radiation proposed by Burridge and Gadd (1977) approximates the daily soil heat flux reasonably well, but the absolute errors are quite large and the method fails at sunset and sunrise when the direction of flux changes. Surface temperature calculated from pyrgeometr measurements has been shown to correlate with measured soil heat flux
Permanent Link: https://hdl.handle.net/11104/0352879