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vol. 8, nr. 1 (2006)
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Dynamics of moisture of top soil layer as information about evaporation intensity
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Grzegorz Janik
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Institute of Environmental Protection and Management, Agricultural University, Pl. Grunwaldzki 24, 50-363 |
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vol. 8 (2006), nr. 1,
pp. 103-117
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abstract:
The paper presents a method allowing to determine the intensity of evaporation from soil surface without plants. The method makes use of solving the inverse task. It depends on determining the search quantity, in this case evaporation intensity, knowing only the dynamics of moisture of the upper soil layers. Applying the TDR method makes possible continuous moisture measurements. It allows the formulation of the water balance for detached soil space for any short time steps. The evaporation intensity was the only unknown in the balance and on this basis it was determined. The laboratory investigations carried out on soil columns showed that accuracy of the presented method ascended with the length of taken time step for which the water balance was formulated. For time step longer then 8 hours the relative error was smaller than 20%. This method was also used for determining the evaporation intensity from soil surface without plants in field conditions.
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keywords:
TDR technology, water balance of top soil layer, intensity of evaporation from soil surface without plants
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original in:
Polish
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