Comportamento térmico de solos no Estado da Bahia.

Abstract

The thermal behavior of the soils at different locations in the State of Bahia was studied using the soil temperature data obtained at different depths. The data collected at the climatological stations of Santa Rita de Cassia, Senhor do Bonfim, Jacobina, Lencois, Salvador, Caetite and Caravelas were used in this study. The bare soil temperature data for the depths of 02, 05, 10, 20, 30, 50 and 100 cm were observed at 12, 18 and 24 UTC during the period from 1978 to 1985. In the case of Salvador, the daily soil temperature data obtained at 20- minute intervals for several days under varying weather conditions were utilized to study de diurnal cycle. The soil temperature data were subjected to Fourier Analysis and the amplitudes and phases were obtained for the first five harmonics in the case of the annual cycle and for the first six harmonics in the case of de diurnal cycle. The thermal diffusivity, damping depth and the velocity of propagation of the temperature wave were determined. The thermal diffusivity of the soil at the climatological station of Salvador-BA was calculated using five different methods. The numerical method was found to be consistent in determining the thermal diffusivity for different soil layers.