Data/hora: 10/06/2024 18:07:57

Provedor de dados: | 90
País: | Brazil
Título: | Estimation of soil moisture in the root-zone from remote sensing data
Autores: | Bezerra,Bergson Guedes; Santos,Carlos Antonio Costa dos; Silva,Bernardo Barbosa da; Perez-Marin,Aldrin Martin; Bezerra,Marcus Vinícius Cândido; Bezerra,José Renato Cortez; Rao,Tantravahi Venkata Ramana.
Data: | 2013-06-01
Ano: | 2013
Palavras-chave: | Standard relationship; SEBAL; Energy balance; Evaporative fraction; Latent heat flux.
Resumo: | Field-based soil moisture measurements are cumbersome. Thus, remote sensing techniques are needed because allows field and landscape-scale mapping of soil moisture depth-averaged through the root zone of existing vegetation. The objective of the study was to evaluate the accuracy of an empirical relationship to calculate soil moisture from remote sensing data of irrigated soils of the Apodi Plateau, in the Brazilian semiarid region. The empirical relationship had previously been tested for irrigated soils in Mexico, Egypt, and Pakistan, with promising results. In this study, the relationship was evaluated from experimental data collected from a cotton field. The experiment was carried out in an area of 5 ha with irrigated cotton. The energy balance and evaporative fraction (Λ) were measured by the Bowen ratio method. Soil moisture (θ) data were collected using a PR2 - Profile Probe (Delta-T Devices Ltd). The empirical relationship was tested using experimentally collected Λ and θ values and was applied using the Λ values obtained from the Surface Energy Balance Algorithm for Land (SEBAL) and three TM - Landsat 5 images. There was a close correlation between measured and estimated θ values (p&lt;0.05, R² = 0.84) and there were no significant differences according to the Student t-test (p&lt;0.01). The statistical analyses showed that the empirical relationship can be applied to estimate the root-zone soil moisture of irrigated soils, i.e. when the evaporative fraction is greater than 0.45.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000300005
Editor: | Sociedade Brasileira de Ciência do Solo
Relação: | 10.1590/S0100-06832013000300005
Formato: | text/html
Fonte: | Revista Brasileira de Ciência do Solo  v.37 n.3 2013
Fonte: | info:eu-repo/semantics/openAccess