Neutral atmospheric boundary layer simulation of the Amazon rainforest using Large-Eddy Simulation
DOI:
https://doi.org/10.5902/2179460X87732Keywords:
Turbulence, Large-Eddy Simulation, Atmospheric Boundary Layer, Amazon RainforestAbstract
The study of the atmospheric boundary layer (ABL) of the Amazon rainforest is important for a better understanding of the biogeochemical phenomena occurring in this region, as well as their local and global impact. Turbulence in the ABL is responsible for mixing chemical components in the canopy, as well as for transporting these substances from the forest floor to the top of the ABL. Large-Eddy Simulation (LES) is one of the main simulation tools for the ABL; however, one of the limitations in its use is in the study of unstable conditions, as the simulation inevitably requires a larger vertical domain, which limits the model's resolution near the surface. To simulate the unstable ABL with adequate resolution in the canopy region, the solution proposed in this work is the use of the One-Dimensional Turbulence (ODT) wall model. When coupled with LES, the ODT replaces the need for mesh refinement near the ground by producing stochastic vortices that mimic the effects of turbulence in this region. In the present work, results of a simulation of the Amazon ABL under neutral stability conditions are presented for a preliminary evaluation. In the vegetation region, the results of mean velocity and shear stress are similar to the GoAmazon field experiment data. On the other hand, the variances and asymmetries show differences that are inherent to the ODT model. In the future, the coupled LES-ODT model may be a useful tool in studies of the unstable Amazonian ABL.
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