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Master's Dissertation
DOI
https://doi.org/10.11606/D.85.2018.tde-23022018-092958
Document
Author
Full name
Márcia Talita Amorim Marques
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2017
Supervisor
Committee
Landulfo, Eduardo (President)
Oliveira, Amauri Pereira de
Rosário, Nilton Manuel Évora do
Title in Portuguese
Obtenção da altura da camada limite planetária através da análise espectral do campo de vento do lidar Doppler
Keywords in Portuguese
altura da camada limite planetária
análise espectral
camada limite planetária
lidar Doppler
Abstract in Portuguese
Este estudo explora a obtenção da altura da camada limite planetária a partir de diferentes métodos e equipamentos, com foco na análise espectral do campo de vento do lidar Doppler. Realizou-se uma campanha de medição por 80 dias com dois lidars Dopplers comerciais com diferentes alcances verticais. Para o lidar com maior alcance vertical e consequetemente uma medida direta da altura da camada limite planetária, foi aplicado o método da variância da razão sinal-ruído e os resultados foram comparados aos valores de altura estimados a partir de dados de radiossondagem através de dois métodos distintos, o método da parcela e o método do número de Richardson bulk, o qual apresentou melhores resultados. Para o lidar com menor alcance vertical, aplicou-se a análise espectral que forneceu valores de comprimento de onda dos picos espectrais, proporcionais à altura da camada limite planetária. A constante de proporcionalidade para obtenção dos valores da altura da camada foi calculada comparando-se os resultados aos valores de altura estimados pela radiossondagem através do método do número de Richardson bulk, obtendo-se um valor de constante de proporcionalidade próximo ao sugerido na literatura. Entretanto, o conjunto de dados que mostrou boas estimativas dos picos espectrais foi bastante restrito, limitando a comparação ao longo do período entre os lidars.
Title in English
Obtaning the planetary boundary layer height using spectral analysis of the Doppler lidar wind field
Keywords in English
Doppler lidar
planetary boundary layer
planetary boundary layer height
spectral analysis
Abstract in English
This study explores the obtaining of the planetary boundary layer height through different methods and equipment, focusing on the spectral analysis of the wind field from Doppler lidar. An 80-day measurement campaign was conducted with two commercial Doppler lidars with different vertical ranges. For the lidar with greater vertical range and consequently a direct measurement of the planetary boundary layer heigth, the method of signal-to-noise ratio variance was applied and the results were compared to the height values estimated from radiosonding data using two different methods, the parcel method and the bulk Richardson number method, which presented better results. For the lidar with a lower vertical range, spectral analysis was applied, which provided wavelength values of the spectral peak, proportional to the planetary boundary layer height. The proportionality constant, in order to obtain the boundary height values, were calculated by comparing the height values estimated from the radiosonding data, using the bulk Richardson number method. Proportionality constant value close to the one found in the literature were obtained. However, the set of data that showed good estimates of the spectral peaks was very restricted, limiting the comparison over the period between the lidars.
 
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Publishing Date
2018-03-01
 
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