Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/946220
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dc.contributor.authorTEIXEIRA, A. H. de C.
dc.contributor.authorHERNANDEZ, F. B. T.
dc.contributor.authorLOPES, H. L.
dc.date.accessioned2018-02-07T23:35:52Z-
dc.date.available2018-02-07T23:35:52Z-
dc.date.created2013-01-24
dc.date.issued2012
dc.identifier.citationProceedings of SPIE - Remote Sensing for Agriculture, Ecosystems and Hrydrology, v. 8531, sept. 2012.
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/946220-
dc.descriptionIn the Nilo Coelho irrigation scheme, Brazil, the natural vegetation has been replaced by irrigated agriculture, bringing importance for the quantification of the effects on the energy exchanges between the mixed vegetated surfaces and the lower atmosphere. Landsat satellite images and agro-meteorological stations from 1992 to 2011 were used together, for modelling these exchanges. Surface albedo (0), NDVI and surface temperature (T0) were the basic remote sensing retrieving parameters necessary to calculate the latent heat flux E) and the surface resistance to evapotranspiration (rs) on a large scale. The daily net radiation (Rn) was obtained from 0, air temperature (Ta) and short-wave transmissivity (sw) throughout the slob equation, allowing the quantification of the daily sensible heat flux (H) by residual in the energy balance equation. With a threshold value for rs, it was possible to separate the energy fluxes from crops and natural vegetation. The averaged fractions of Rn partitioned as H and E, were in average 39 and 67%, respectively. It was observed an increase of the energy used for the evapotranspiration process inside irrigated areas from 51% in 1992 to 80% in 2011, with the ratio E/Rn presenting an increase of 3 % per year. The tools and models applied in the current research, can subsidize the monitoring of the coupled climate and land use changes effects in irrigation perimeters, being valuable when aiming the sustainability of the irrigated agriculture in the future, avoiding conflicts among different water users.
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectAlbedo da superfície
dc.subjectTemperatura da superfície
dc.subjectNDVI
dc.subjectFluxo de calor latente
dc.subjectFluxo de calor sensível
dc.subjectResistência da superficie
dc.subjectSensorimento remotopt_BR
dc.subjectNatural resourcept_BR
dc.titleApplication of Landsat images for quantifying the energy balance under conditions of land use changes in the Semi-Arid region of Brazil.
dc.typeArtigo de periódico
dc.date.updated2018-02-07T23:35:52Zpt_BR
dc.subject.thesagroRecurso natural
dc.subject.nalthesaurusRemote sensing
riaa.ainfo.id946220
riaa.ainfo.lastupdate2018-02-07
dc.contributor.institutionANTONIO HERIBERTO DE C TEIXEIRA, CPATSA; FERNANDO B. T. HERNANDEZ; HÉLIO L. LOPES.
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