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- Title
The use of numerical modelling to assess soil water dynamics in subsurface irrigation.
- Authors
Oliveira Rocha, Mayara; dos Santos Teixeira, Adunias; das Chagas da Silva Filho, Francisco; Sonsol Gondim, Rubens; Oliveira de Sousa, Alan Bernard
- Abstract
Knowledge of soil water dynamics is essential for establishing appropriate methods of irrigation management. Water dynamics in unsaturated soils is a complex process that can be explained by the Richards equation. As this is a non-linear differential equation, there is no analytical solution, but requires the use of the finite element method, for example, to obtain solutions, where simulations using numerical modelling make it p ossible to predict the the flow of water from the soil. As such, the aim of this study was to evaluate a 2D numerical model in simulating wate r distribution and wet bulb formation resulting from a subsurface irrigation system, in addition to validating the generated model. The Pearson correlation coefficient (r), the coefficient of deter mination (R2) and the root-mean-square error (RMSE) were calculated. For each treatment, both during and after irrigation, the model showed a small relative error, high values for R2 and a positive correlation with the field data. It was concluded that the model is applicable to the design and management of subsurface irrigation systems, varying the installation depth of the drip tube, the spacing between emitters and the soil moisture, giving good results for the various simulated scenarios.
- Subjects
SUBIRRIGATION; SOIL moisture; MICROIRRIGATION; SOIL dynamics; IRRIGATION management; NONLINEAR differential equations; WATER efficiency
- Publication
Revista Ciência Agronômica, 2023, Vol 54, p1
- ISSN
0045-6888
- Publication type
Article
- DOI
10.5935/1806-6690.20230034