Análise Comparativa do Fluxo de Calor no Solo em Profundidade e na Superfície (Brazil Comparative Analysis of Soil Heat Flux in Depth and Surface)
DOI:
https://doi.org/10.26848/rbgf.v6i4.233057Keywords:
método harmônico, temperatura do solo, fluxímetro.Abstract
O objetivo deste estudo é comparar os resultados do fluxo de calor no solo, na superfície e em profundidade, encontrados por sensores de fluxo de calor no solo e pelo método harmônico, em cultivo de mamoneira. No dia sem chuvas, a pouca quantidade de água no solo diminuiu a sua difusividade térmica, provocando um maior acúmulo de energia no solo, e, consequentemente, a elevação na temperatura nas camadas mais próximas à superfície. As principais diferenças entre os valores medidos e estimados aconteceram nos horários de maior insolação, principalmente nos dias em que o céu estava encoberto por nuvens. A presença da vegetação cobrindo o solo influenciou diretamente nos valores medidos e modelados. As estimativas tanto em profundidade como para a superfície do solo se mostraram bastante satisfatórias, tanto em dias de céu claro como para dias de céu encoberto.
A B S T R A C T
The aim of this study was to compare the results of soil heat flow, in the surface and depth, found by sensors soil heat flux and by harmonic method, in castor crop . On days without rainfall, the small amounts of water in the soil decreased its thermal diffusivity, causing a higher energy accumulation in the soil and consequently an increase at a temperature on the layers nearest the surface. The main differences between the measured and estimated values occurred at times of intense sunlight, especially on days when the sky was obscured by clouds. The presence of vegetation covering the soil directly influenced the values measured and modeled. Estimates both in depth and to the soil surface proved very satisfactory, both in clear sky conditions as for overcast days.
Key-Words: Harmonic Method, Soil temperature, soil heat flux plates.
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