Open AccessAvaliação da Similaridade entre as flutuações turbulentas de escalares em ambiente de lago
Author(s) -
Fernando Augusto Silveira Armani,
Nelson Luı́s Dias,
Dornelles Vissotto
Publication year - 2020
Publication title -
ciência e natura
Language(s) - English
Resource type - Journals
eISSN - 2179-460X
pISSN - 0100-8307
DOI - 10.5902/2179460x45355
Subject(s) - scalar (mathematics) , wind speed , physics , similarity (geometry) , humidity , thermodynamics , meteorology , atmospheric sciences , environmental science , mathematics , geometry , artificial intelligence , computer science , image (mathematics)
This paper presents an evaluation of scalar similarity and scalar flux similarity of measurements above the water surface of the Itaipu hydroelectric reservoir. The scalars studied were: CO2 mixing ratio (rc), air temperature (θ), specific air humidity (q) and the vertical wind velocity (w). With the variance method it was found that the vertical wind velocity is in agreement with Monin-Obukhov Similarity Theory. On the other hand, the other scalars presented larger deviations in relation to the theoretical prediction. The worst results were for air temperature and mixing ratio of CO2. The most similar scalars were θ and q, with the most frequent correlation coefficient varying in the range [0.55:0.64] for measurements in unstable atmospheric conditions and in the [−0.85:−0.75] range for measurements under stable atmospheric conditions. Regarding the scalar fluxes, they presented greater similarity to each other than the scalars themselves.