Characterization of soil thermal dynamics in natural pasture over the brazilian Pampa biome: estimates of soil thermal properties
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2022-06-14Autor
Zimmer, Tamíres 
Primeiro orientador
Roberti, Débora Regina
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To characterize the soil thermal dynamics, it is necessary to determine its thermal properties
because they describe how thermal energy is stored and distributed according to time
and depth; this knowledge is important for characterizing the local microclimate. Hence,
quantifying soil and surface temperatures and estimating heat storage are pivotal for
surface energy balance studies. Given the above, this study aims to quantify and analyze
soil thermal properties in native grasslands in the Brazilian Pampa biome through hybrid
methods based on experimental data and analytical methods through two articles. In
the first, the influence of climatic conditions such as sky cover and soil moisture ( ) on
the dynamics of soil thermal variables (soil heat flux, G, and soil temperature, Ts) and
soil thermal properties is investigated. The results showed that the highest values of
thermal conductivity ( ) and thermal diffusivity (k) were obtained in periods with moist
soil. Moreover, greater variability of soil thermal properties with increasing moisture was
observed. The proposal of a new empirical model for ( ) provided good results to represent
the experimental and estimate G. The second article presents the estimation of thermal
properties and soil temperature obtained from the analytical solution of the heat transfer
equation by conduction and conduction-convection. The obtained results shed more light on
the thermal dynamics of the soil by considering the conductive and convective processes of
heat in the soil at different depths. Moreover, the thermal properties of the soil were shown
to vary at different levels, in addition to vertical heterogeneity in the thermal properties of
the soil as a function of soil moisture for dry and wet periods. The study results show the
influence of soil moisture and climatic conditions on soil thermal dynamic characterization.
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