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Modelling interception loss from evergreen oak Mediterranean savannas: Application of a tree-based modelling approach
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Orientador(es)
Resumo(s)
In a previous study, it was shown that an isolated, fully saturated tree-crown behaves like a
wet bulb, allowing evaporation of intercepted rainfall to be estimated by a simple diffusion
equation for water vapour. This observation was taken as the basis for a new approach in
modelling interception loss fromsavanna-type woodland, whereby the ecosystem evaporation
is derived by scaling up the evaporation from individual trees, rather than by considering
a homogeneous forest cover. Interception loss from isolated trees was estimated by
combining the aforementioned equation for water vapour flux with Gash’s analytical model.
A new methodology, which avoids the subjectivity inherent in the Leyton method, was used
for estimating the crown storage capacity. Modelling performance was evaluated against
data from two Mediterranean savanna-type oak woodlands (montados) in southern Portugal.
Interception loss estimates were in good agreement with observations in both sites. The
proposed modelling approach is physically based, requires only a limited amount of data
and should be suitable for the modelling of interception loss in isolated trees and savannatype
ecosystems.
Descrição
Palavras-chave
Rainfall interception Rainfall interception Isolated trees Savannas Quercus ilex Wet bulb temperature Gash analytical model
Contexto Educativo
Citação
Pereira, F.L.; Gash, J.H.C.; David, J.S.; David, T.S.; Monteiro, P.R.; Valente, F., 2009. Modelling interception loss from evergreen oak Mediterranean savannas: Application of a tree-based modelling approach. Agricultural and Forest Meteorology, 149(3-4): 680-688. DOI: 10.1016/j.agrformet.2008.10.014