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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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The objective of the present study was to determine the spatial behaviour of the Soil Water Index (SWI) by applying a distributed version of the Tank Model (D-Tank Model) to verify its reliability through the comparison to soil moisture estimated with the measured water-tension values and the water retention curve. The comparison between the spatially distributed values of the SWI and soil moisture confirmed the high potential of the SWI for predictions related to hydrological sciences.
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https://doi.org/10.5194/hess-2019-682
https://doi.org/10.5194/hess-2019-682

  28 Jan 2020

28 Jan 2020

Review status: a revised version of this preprint is currently under review for the journal HESS.

Evaluation of Soil Water Index of distributed Tank Model in a small basin with field data

Sofia Melo Vasconcellos1, Masato Kobiyama1, and Aline de Almeida Mota2 Sofia Melo Vasconcellos et al.
  • 1Institute of Hydraulic Researches, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
  • 2Department of Environmental and Sanitary Engineering, Federal University of Fronteira Sul, Chapecó, Brazil

Abstract. The objective of the present study was to determine the spatial behaviour of the Soil Water Index (SWI) by applying a distributed version of the Tank Model (D-Tank Model) to the Araponga river basin (5.26 ha) in southern Brazil and to verify its reliability through the comparison to soil moisture estimated with the measured water-tension values and the water retention curve. The study area has a monitoring system for rainfall, discharge (5-min interval), and soil-water tension (10-min interval). The simulation results showed that the D-Tank Model has a reliable performance. The correlation between SWI and HAND was reasonable (r = 0.6) meanwhile that between SWI and the Topographic Wetness Index was high (r = 0.88). The comparison between the spatially distributed values of the SWI and soil moisture confirmed the high potential of the SWI derived from the D-Tank Model to be applied for predictions related to hydrological and environmental sciences.

Sofia Melo Vasconcellos et al.

 
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Sofia Melo Vasconcellos et al.

Sofia Melo Vasconcellos et al.

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Short summary
The objective of the present study was to determine the spatial behaviour of the Soil Water Index (SWI) by applying a distributed version of the Tank Model (D-Tank Model) to verify its reliability through the comparison to soil moisture estimated with the measured water-tension values and the water retention curve. The comparison between the spatially distributed values of the SWI and soil moisture confirmed the high potential of the SWI for predictions related to hydrological sciences.
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