Estimativas da Difusividade Térmica e do Fluxo de Calor de um Solo no Agreste Pernambucano (Estimates of thermal diffusivity and heat flow of a soil in Agreste Pernambucano)
DOI:
https://doi.org/10.5935/1984-2295.20150053Keywords:
Temperatura do Solo, Difusividade Térmica do Solo, Fluxo de Calor do SoloAbstract
Conhecer as características térmicas do solo é de fundamental importância para entendimento de seus processos físicos. Este trabalho objetivou estimar o fluxo de calor do solo através da lei de Fourier para o transporte de calor e a difusividade térmica do solo utilizando seis métodos (fase, amplitude, logaritmo, condução-convecção, arco tangente e diferenças finitas) em um solo típico. Para isto, foram medidas temperaturas nas profundidades de 0,02; 0,08; 0,10; 0,20; 0,30; 0,40; 0,50 m por meio de termopares ao longo dos primeiros dez dias do ano. A eficácia dos métodos foi comprovada através de simulações deste mesmo perfil de temperatura do solo onde os algoritmos arco tangente e condução-convecção apresentaram os melhores resultados e parâmetros estatísticos, enquanto o método das diferenças finitas destoou dos demais. Estimativas do fluxo de calor foram realizadas a partir dos dados medidos e dos estimados, correspondendo aos mesmos resultados obtidos para cada um dos métodos em particular.
A B S T R A C T
Knowing the thermal characteristics of the soil is of fundamental importance for understanding their physical processes. This study aimed to determine soil heat flux through the Fourier's law for the transport of heat and thermal diffusivity of the soil using six methods (phase, amplitude logarithm conduction-convection, and finite differences arctangent) in a soil wild Pernambucano. For this, temperatures were measured at depths of 0.02; 0.08; 0.10; 0.20; 0.30; 0.40; 0.50 m by means of thermocouples during the first ten days of the year. The effectiveness of the methods has been proven through the soil temperature profile simulations where the algorithms arc tangent and driving-convection showed the best results and statistical parameters, while the finite difference method disagreed when compared the other. Heat flux estimates were made from the boundary conditions of the measured data. The best results observed in the surface layers, while the estimated values did not show satisfactory results in deeper layers.
Keywords: soil temperature, soil heat capacity, thermal conductivity in the soil.
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Copyright (c) 2016 Diogo Botelho Correa de Oliveira, Nelson Aquino de Albuquerque Neto, Willames de Albuquerque Soares
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