Evaluation of the METRIC and TSEB remote sensing evapotranspiration models in the floodplain area of the Thaya and Morava Rivers

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1016/j.ejrh.2024.101785. This is version 2 of this Preprint.

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Authors

Tomas Ghisi, Milan Fischer, Héctor Nieto, Natalia Kowalska, Georg Jocher, Lucie Homolová, Vicente Burchard-Levine, Zdeněk Žalud, Miroslav Trnka

Abstract

Study region: Floodplain ecosystem region at the confluence of the Morava and Thaya Rivers, Czech Republic.


Study focus: Accurate determination of actual evapotranspiration (ETa) is essential for understanding surface hydrological conditions. The aim of this study was to evaluate two remote sensing models, METRIC and TSEB, for estimating ETa and energy fluxes in two ecosystems using the eddy covariance (EC) as a reference.


New hydrological insights for the region: Both models demonstrate the ability to quantify ETa across the region. Compared with the METRIC, which had a mean bias error (MBE) = 0.12 mm/day, the TSEB better detected ETa in the forest test site (MBETSEB = -0.03 mm/day). In contrast, the METRIC improved detection of ETa (MBEMETRIC = -0.03 mm/day) in grassland test site, where the TSEB overestimate daily ETa (MBETSEB = 0.52 mm/day). The models and EC indicate similar seasonal dynamics of the evaporative fraction and Bowen ratio throughout the growing season. Despite the overall agreement between the models and EC, the selected spatial outputs indicate some disagreement among them in terms of the spatial patterns of ETa. This disagreement is related to the sensitivity of TSEB to canopy height/roughness, as well as the a priori Priestley-Taylor coefficient in forests. Despite these shortcomings, this study highlights the applicability of remote sensing energy balance-based diagnostic models for studying hydrological processes in a spatially distributed manner.

DOI

https://doi.org/10.31223/X5797B

Subjects

Hydrology, Other Earth Sciences, Other Forestry and Forest Sciences

Keywords

evapotranspiration, Floodplain ecosystem, Remote sensing models, water balance, TSEB, Metric, Remote sensing models, water balance, Floodplain forest

Dates

Published: 2024-04-23 22:34

Last Updated: 2024-04-24 13:28

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License

CC-By Attribution-NonCommercial-NoDerivatives 4.0 International

Additional Metadata

Data Availability (Reason not available):
Data are not public. Data could be provided upon request from the aplicant.