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Conhecer as caracteristicas termicas do solo e de fundamental importância para entendimento de seus processos fisicos. Este trabalho objetivou estimar o fluxo de calor do solo atraves da lei de Fourier para o transporte de calor e a difusividade termica do solo utilizando seis metodos (fase, amplitude, logaritmo, conducao-conveccao, arco tangente e diferencas finitas) em um solo tipico. 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 eficacia dos metodos foi comprovada atraves de simulacoes deste mesmo perfil de temperatura do solo onde os algoritmos arco tangente e conducao-conveccao apresentaram os melhores resultados e parâmetros estatisticos, enquanto o metodo das diferencas 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 metodos 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.

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)