Estimation of sensible heat flux from radiometric temperature over crop canopy

Abstract

A numerical experiment was conducted during the harvesting period of potato crop by Lhcmme to estimate sensible
heat flux from radiometric surface temperature over the canopy. The model of Lhomme was in terms of the characteristics
of the crop and meteorological profiles within the canopy. In the model, Lhomme introduced an additional resistance so
called canopy aerodynamic resistance. Hence the total resistance to the heat transfer from canopy to the air is the sum of
canopy aerodynamic resistance and usual classical aerodynami.c resistance. It is not very easy to work out analytical
solutions for the additional aerodynamic resistance. In this paper, an attempt is made to reformulate the model and
present the simplified mathematical procedures to calculate the canopy aerodynamical resistance. Finally, the predidictions
of the reformulated model were compared with those of Lhomme's model.