Estudo de geotermia rasa na cidade de Humait??-AM

Autor: Pimentel, Elizabeth Tavares
Přispěvatelé: Ara??jo, Rut??nio Luiz Castro de
Jazyk: portugalština
Rok vydání: 2009
Předmět:
Zdroj: Biblioteca Digital de Teses e Dissertações da UFAM
Universidade Federal do Amazonas (UFAM)
instacron:UFAM
Popis: Made available in DSpace on 2015-04-22T21:58:27Z (GMT). No. of bitstreams: 1 Elizabeth Tavares Pimentel.pdf: 1766165 bytes, checksum: 014e86903e1eaf04dbad226c2450a908 (MD5) Previous issue date: 2009-04-06 From October 2007 to September 2008 a geothermal monitoring experiment was conducted at depths of 0.02 m, 0.5 m and 1.0 m to quantify the variations of temperature, thermal conductivity and the shallow geothermal heat flow at places with and without vegetation cover in the Humait?? city, Amazonas. The influence of the vegetation cover on the shallow geothermal system was observed in the sites studied. There were variations of monthly average values of temperature between the places with and without vegetation cover. During the "dry" period, this variation was up to 6.01??C at the depth of 0.02 m, and 2.84??C at the depth of 1.0 m. During the "rainy" period, however, the variation was up to 2.94??C, at the depth of 0.02 m, and 2.51??C at the depth of 1.0 m. The difference of the daily extreme values of temperature between sites with and without vegetation cover were 3.97??C during the "rainy" period and 9.63??C during the "dry" period, at the depth of 0.02 m. It was noticed that at 06:00 PM the magnitude of the temperature remained high compared to other times on the day studied. The values of the thermal conductivity were 0.54 W/m??C during the "dry" period, and 1.23 W/m??C during the "rainy" period. The values of the shallow geothermal flows at depths of 0.5 m and 1.0 m, were 2.51 W/m?? and 0.64 W/m??, respectively. These values are 10?? larger than the terrestrial heat flow in the region. The thermal variations at0.5 m to 1.0 m depth are influenced by external sources that reach the surface and cannot be neglected. The thermal variations recorded in this work are important and fundamental to better understanding the shallow geothermal structure in the southern, part of Amazonas state, and they also contribute as input to models that allow the mitigation or elimination of the effects caused by anthropogenic actions No per??odo de outubro de 2007 a setembro de 2008 foi realizado monitoramento geotermal, ??s profundidades de 0,02 m, 0,5 m e 1,0 m, em locais com e sem cobertura vegetal, na cidade de Humait?? (AM), a fim de quantificar as varia????es de temperatura, condutividade t??rmica e fluxo geotermal raso local. Constatou-se a influ??ncia da cobertura vegetal sobre o regime geotermal raso na regi??o estudada. Houve varia????o dos valores m??dios mensais da temperatura nos locais cc e sc. No per??odo "seco", esta varia????o foi de at?? 6,01??C ?? profundidade de 0,02 m, e de 2,84??C ?? profundidade de 1,0 m; j?? no per??odo "chuvoso", a varia????o foi de at?? 2,94??C a 0,02 m de profundidade e de 2,51??C ?? profundidade de 1,0 m. Na profundidade de 0,02 m, a diferen??a entre os valores di??rios m??ximos, nos locais cc e sc, foi de 3,97??C no per??odo "chuvoso" e de 9,63??C no per??odo "seco". ??s 18 h, as magnitudes da temperatura permaneceram elevadas em rela????o aos outros hor??rios estudados. Os valores de condutividade t??rmica foram de 0,54 W/m??C no per??odo "seco" e de 1,23 W/m??C no per??odo "chuvoso". Os valores do fluxo geotermal raso, ??s profundidades de 0,5 m e 1,0 m, variaram at?? 2,51 W/m?? e 0,64 W/m??, respectivamente. Tais valores s??o da ordem de 10?? acima do valor do fluxo t??rmico terrestre profundo na regi??o. As varia????es termais a 0,5 m e a 1,0 m de profundidade s??o influenciadas por fontes externas que atingem a superf??cie e n??o podem ser negligenciadas. As varia????es t??rmicas registradas neste trabalho s??o importantes e fundamentais para o melhor conhecimento da estrutura geotermal rasa na cidade de Humait?? (AM), como tamb??m, contribuem para a elabora????o de modelos que possibilitem mitigar ou eliminar os efeitos causados por a????es antr??picas
Databáze: OpenAIRE
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