Estudo da influência da interação solo-atmosfera nos perfis de umidade, sucção e temperatura de um subsolo não saturado
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Data
2012-11-22
Autores
Vivacqua, Gabriel Peixoto Derenzi
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Universidade Federal do Espírito Santo
Resumo
The aim of the present work is to investigate the influence of the soil-atmosphere interaction on the soil moisture, suction and temperature profile of an unsaturated subsoil. It is also investigated the depth of the active zone , the region of the soil influenced by climatic changes. A soil-atmosphere interface numerical model is used to calculate the rate of evaporation from the soil, and a mass flow equation (liquid water - Darcys Law and vapour - Ficks Law) coupled with a heat flow equation (de Vries, 1987) have been adopted to determine the soil temperature, moisture and pore pressure profiles. For the numerical simulations is adopted a one-dimensional computer program which uses the Finite Difference Method for solving simultaneously the mass flow (liquid and vapour water) and heat flow partial differential equations. The analyzes uses a set of climate data from Mormoiron, France, between the years 2004 and 2005. During the analysis, soil parameters and climatic data were manipulated, and the results of the analysis were compared with reference cases. Among the conclusions, it can be mentioned: (a) a variation on the initial soil temperature profile (ITP) can affect the soil temperature profiles, especially in the deeper region where the soil temperature remains stable throughout the year; (b) the Albedo parameter can do affect the soil temperature profile, especially in the hot season (great solar radiation). During the winter, changes in albedo values has quite no influence in the soil temperature and water content; (c) the active zone in the study region has about 1.5 m. From this depth, the soil temperature, moisture and suction profiles becomes practically constant over the year; (d) the use of average values, as daily inputs, modify the depth of the active zone, suggesting that under extreme conditions the depth of the active zone, in a particular region, can be changed; (e) the intensity and distribution of the precipitation can affect the soil moisture and soil suction profiles
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Palavras-chave
evaporation , soil-permability , soil-temperature , soil-mosture , soil-matric , suction , Evaporação , Solos - Permeabilidade , Solos -Temperatura , Solos - Umidade , Solos - Potencial matricial
Citação
VIVACQUA, Gabriel Peixoto Derenzi,. Estudo da influência da interação solo-atmosfera nos perfis de umidade, sucção e temperatura de um subsolo não saturado. 2012. 174 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal do Espírito Santo, Centro Tecnológico, Vitória, 2012.