Abstract
Evapotranspiration is one of the key elements of water balance in nature. It significantly influences the water supply in the unsaturated zone of a soil profile. The unsaturated zone is a water source for the biosphere. The aim of this study is to measure, calculate and analyze the course of actual evapotranspiration, precipitation and dew totals as well as the totals of water flows at the lower boundary of unsaturated zone and the change in water content in specified soil volume. The measurements are used for verifying the results of numerical simulation. The methods used in the study were chosen based on the hypothesis that dynamics of water supply changes in the unsaturated zone is the result of the interactions between atmosphere, soil and plant cover. The elements of water balance were quantified by the methods of water balance, lysimeter measurements and numerical simulation on the model HYDRUS-1D, version 4. The abovementioned parameters were quantified for the East Slovakian Lowland, with an hourly time step during the years 2017, 2018 and 2020. The measurements have shown that evapotranspiration exceeded precipitation during all monitored periods, specifically by 22% in 2017, by 14% in 2019, and by 10% in 2020. The deficit was compensated for by capillary inflow from the groundwater level and the water supply in the unsaturated zone. A verification by measurement has shown that numerical simulation is imprecise in relation to the quantification of water flows at the lower boundary of the unsaturated zone. This inaccuracy is manifested in the higher value of the actual evapotranspiration, which is on average exceeded by 11%. The performance of the mathematical model is assessed as satisfactory for the analysis of the soil water regime.
Funder
Scientific Grant Agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic
Subject
Water Science and Technology,Aquatic Science,Geography, Planning and Development,Biochemistry
Reference68 articles.
1. Spatial Heterogeneity in Sensitivity of Evapotranspiration to Climate Change;Wang;Pol. J. Environ. Stud.,2017
2. Estimating Precipitation and Actual Evapotranspiration from Precision Lysimeter Measurements;Schrader;Procedia Environ. Sci.,2013
3. Benefits from Tying Satellite-Based Energy Balance to Reference Evapotranspiration;Allen;AIP Conf. Proc.,2006
4. Borin, M., and Sattin, M. (1995). Third Congress of the European Society for Agronomy. Padova University, 18–22 September 1994, ESA.
5. Novák, V. (2012). Evapotranspiration in the Soil-Plant-Atmosphere System, Progress in Soil Science; Springer.
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