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- Title
Using the inflection point height in the wind profile to obtain dimensionless profiles above the amazon forest.
- Authors
Matos Pinheiro, Di Angelo; Dias-Júnior, Cléo Quaresma; de Abreu Sá, Leonardo Deane; Manzi, Antônio Ocimar
- Abstract
The most turbulent vortices that populate the forest-atmosphere interface have canopy height length scales. These vortices are mainly responsible for turbulent exchanges between inside and above canopy region. Thus, we used the vertical wind profiles obtained by 10 anemometers installed inside and above the forest canopy of the Rebio-Jarú experimental site, in the Amazon Rainforest. A third degree polynomial function was developed to better fit the wind profile and therefore estimate the inflection point height of the vertical wind profile (zi) a length scale associated with wind shear (Ls), and the wind speed at height zi. These length and velocity scales were used to obtain better fits for the dimensional wind profiles and turbulence statistical moments. Three dimensionless profile models were compared using friction velocity, wind velocity in zi and wind velocity at canopy height. It was observed that the dimensionless profiles using the velocity and shear calculated at zi provided support for the elaboration of more realistic parameterization of the turbulent exchange processes that occur both at the forest-atmosphere interface and inside the canopy.
- Subjects
WIND speed; FOREST canopies; FRICTION velocity; INFLECTION (Grammar); WIND shear
- Publication
Revista Ciência e Natura, 2020, Vol 42, p1
- ISSN
0100-8307
- Publication type
Article
- DOI
10.5902/2179460X53225