Application of landsat images for quantifying the energy balance under conditions of land use changes in the semi-arid region of Brazil

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dc.contributor.authorTeixeira, Antônio H. de C.
dc.contributor.authorHernandez, Fernando B. T. [UNESP]
dc.contributor.authorLopes, Hélio L.
dc.contributor.institutionEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de Pernambuco (UFPE)
dc.date.accessioned2014-05-27T11:27:18Z
dc.date.available2014-05-27T11:27:18Z
dc.date.issued2012-12-01
dc.description.abstractIn the Nilo Coelho irrigation scheme, Brazil, the natural vegetation has been replaced by irrigated agriculture, bringing importance for the quantification of the effects on the energy exchanges between the mixed vegetated surfaces and the lower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 (α0), NDVI and surface temperature (T0) were the basic remote sensing retrieving parameters necessary to calculate the latent heat flux (λE) and the surface resistance to evapotranspiration (rs) on a large scale. The daily net radiation (Rn) was obtained from α0, air temperature (Ta) and short-wave transmissivity (τsw) 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 λE, 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 λE/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. © 2012 SPIE.en
dc.description.affiliationEmbrapa Semiárido, Petrolina
dc.description.affiliationUniversidade Estadual de São Paulo, Ilha Solteira, São Paulo
dc.description.affiliationUniversidade Federal de Pernambuco, Recife
dc.description.affiliationUnespUniversidade Estadual de São Paulo, Ilha Solteira, São Paulo
dc.identifierhttp://dx.doi.org/10.1117/12.965882
dc.identifier.citationProceedings of SPIE - The International Society for Optical Engineering, v. 8531.
dc.identifier.doi10.1117/12.965882
dc.identifier.issn0277-786X
dc.identifier.issn1996-756X
dc.identifier.scopus2-s2.0-84880293170
dc.identifier.urihttp://hdl.handle.net/11449/73837
dc.language.isoeng
dc.relation.ispartofProceedings of SPIE - The International Society for Optical Engineering
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectLatent heat flux
dc.subjectNDVI
dc.subjectSensible heat flux
dc.subjectSurface albedo
dc.subjectSurface resistance
dc.subjectSurface temperature
dc.subjectEnergy balance equations
dc.subjectIrrigated agriculture
dc.subjectIrrigation schemes
dc.subjectLANDSAT satellite images
dc.subjectSurface temperatures
dc.subjectArid regions
dc.subjectAtmospheric temperature
dc.subjectClimate models
dc.subjectEcosystems
dc.subjectEnergy balance
dc.subjectEvapotranspiration
dc.subjectHydrology
dc.subjectIrrigation
dc.subjectLand use
dc.subjectLatent heat
dc.subjectRemote sensing
dc.subjectSatellite imagery
dc.subjectSolar radiation
dc.subjectSurface properties
dc.subjectVegetation
dc.subjectWater supply
dc.subjectHeat flux
dc.titleApplication of landsat images for quantifying the energy balance under conditions of land use changes in the semi-arid region of Brazilen
dc.typeTrabalho apresentado em evento
dcterms.licensehttp://proceedings.spiedigitallibrary.org/ss/TermsOfUse.aspx
unesp.author.lattes7276242706611764[2]
unesp.author.orcid0000-0001-9241-243X[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Engenharia, Ilha Solteirapt

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Artigos - Fitossanidade, Engenharia Rural e Solos - FEIS