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A temperatura do solo pode interferir em diversas atividades antropicas. E de grande importância o conhecimento desse fenomeno para diversas areas, como as ciencias ambientais, a agricultura, a engenharia e a geografia fisica A difusividade termica e um dos parâmetros termodinâmicos mais relevantes do solo, tendo grande relevância na descricao deste fenomeno. Em Sao Joao, regiao Agreste do Estado de Pernambuco, O estudo teve como objetivo determina-la atraves do algoritmo da conducao-conveccao, dividindo-a em camadas distintas, sendo avaliado seu desempenho nas profundidades de 0,08; 0,20 e 0,40 m atraves de perfis de temperaturas. A metodologia se mostrou eficaz e obteve alta correspondencia estatistica, com erros quadraticos medios percentuais inferiores a 1,9%, adquirindo poucas flutuacoes em picos maximos de temperaturas diarias para a camada mais superficial. O teste de Tukey nao apresentou diferencas significativas entre os dados de campo e os valores simulados. A subdivisao do solo em camadas distintas mostrou-se necessaria para se obter uma modelagem computacional eficiente e o metodo utilizado foi considerado adequado para uso na regiao estudo e para tipo do solo apresentado. A B S T R A C T Soil temperature can interfere with various anthropogenic activities. The knowledge of this phenomenon is of great importance for several areas, such as the environmental sciences, agriculture, engineering and physical geography. Thermal diffusivity is one of the most relevant thermodynamic parameters of the soil, having great relevance in the description of this phenomenon. In Sao Joao, in the Agreste region of the State of Pernambuco, the objective of this study was to determine it through the conduction-convection algorithm, dividing it into distinct layers, and its performance at depths of 0.08; 0.20 and 0.40 m through temperature profiles. This methodology was effective and obtained a high statistical correspondence, with the average percentage of quadratic errors being lower than 1.9%, acquiring few fluctuations in maximum peaks of daily temperatures for the most superficial layer. The Tukey test did not present significant differences between the field data and the simulated values. The subdivision of the soil into distinct layers was necessary to obtain an efficient computational modeling and the method used was considered suitable for use in the study region and for the soil type presented. Key words: Thermal diffusivity soil, convection – conduction algorithm, soil temperature, computational modeling.

revista brasileira de geografia física

Determinação da Difusividade Térmica de um Solo Multicamadas Através do Algoritmo Condução-Convecção (Determination of the Thermal Diffusivity of a Multi-layered Soil Through a Conduction-Convection Algorithm)