Wednesday, 11 June 2008: 10:45 AM
Aula Magna Vänster (Aula Magna)
Since Thome (1971) it is known that abouve rough surfaces gradients are
smaller than predicted by Monin-Obkhov similarity theory (MO-theory). In 1989 Raupach
proposed with the localized near field theory (LNF) a lagrangian approach to model
source distributions in plant canopies. This theory can be used to derive a
general formulation for profiles within and above plant canopies. Comparing
such profiles with profiles predicted by MO-theory gives insight into the
mechanisms leading to the deviation from MO-theory. These are mainly the
enhacement of turbulence which reduces gradients and the near field effects
in turbulence which enhance gradients.
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