Avaliação do modelo híbrido, para obtenção de temperatura do solo, na região de Pelotas - RS

Abstract

This study made an evaluation about the S. Kang’s Hybrid Model adequacy, in order to obtain an average temperature of the soil in the region of Pelotas – RS, starting mainly from the average air temperature information. The Hybrid Model is based on an empiric relation between the air and soil temperatures, as well as the heat transfer physics. The results generated by the model were compared with the ones generated by the collected data at the Agricultural/climatological Station, a concord by EMBRAPA/UFPel, located at the UFPel Campus, in Capão de Leão-RS, from a period of twenty three years, between 1966 and 1988. The average temperature results of the soil were analyzed, and estimated for three different depths: five, ten and twenty centimeters. For the depth of five centimeters, the model generated average results that showed a very good agreement with the soil temperature daily average of the measured data, only presenting small differences. The season of the year that was most adequate for the model was winter and summer was the most discordant. The general average standard deviation in the entire period for these results showed identical values for the simulation and the data collected. All of the curves generated by the model followed a behavior pattern of the curves drawn from the real data values. There was a stronger underestimation of the results for the depths of ten and twenty centimeters, and this fact was more evident at bigger depths. However, the simulation by the model adequately recreated the behavior of the average data. The standard deviation for these depths presented a smaller dissipation on the charts than the supplied data. There was a discussion about the applied methodology, and it was concluded that it favored a generalization during the application of the model, which possibly generated differences. However, some adequacies were made for the purpose proposed in this work.