Soil thermal characteristics at Salvador, BA

Revista Brasileira de Engenharia Agrícola e Ambiental

Moreira, Atílio A.¹  Silva, Bernardo B. da²  Rao, Tantravahi V. Ramana² 

[1] INMET, Salvador;UFCG, Campina Grande

关键词: thermal diffusivity;    soil temperature;    damping depth    INTRODUÇÃO As propriedades térmicas do solo são resultantes de um conjunto de fatores nos quais se incluem a sua textura e composição química;    no entanto;    as observações regulares de sua temperatura em diferentes profundidades possibilitam identificar-se o seu comportamento térmico e o conhecimento de importantes propriedades;    tais como difusividade e a condutividade térmica;   

DOI  :  10.1590/S1415-43662005000400018

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

The thermal behavior of the soil (annual cycle) at Salvador (13º 01' S; 38º 31' W; 51,4 m), a tropical station in Northeast Brazil, was studied using the soil temperature data collected at the depths of 0.02, 0.05, 0.10, 0.20, 0.30, 0.50 and 1.00 m. The daily cycle was studied using the soil temperature data collected at the depths of 0.05, 0.20 and 0.50 m at 20 min intervals with the help of an automatic meteorological station developed by a German firm Lambrecht Klimatologiche Messtechnik. The soil at the experimental station is classified as distrophic Yellow Latosol. The thermal diffusivity for the annual cycle was determined using the amplitude method. For the daily cycle the thermal diffusivity was determined by employing different methods: Amplitude Method, Phase Method, Arctangent Method, Logarithmic Method and Numerical Method. The values of thermal diffusivity obtained through the Amplitude and Logarithmic methods show more consistency. The velocity of propagation of the heat wave is of 0.89 x 10-5 m s-1 and the damping depth is 0.12 m for the daily cycle.

【 授权许可】

CC BY-NC