Heterogeneidade da Rugosidade em Terrenos Complexos e Implicações para o Aproveitamento Eólico (Heterogeneity of Roughness in Complex Terrains and Implications for Wind Power)
DOI:
https://doi.org/10.26848/rbgf.v9.2.p546-554Keywords:
GPA. Rugosidade do relevo. Aproveitamento eólico.Abstract
A demanda para a produção de energia renovável e de baixo impacto ambiental cresce a cada ano e, com isso, há também o aumento do interesse em turbinas eólicas de pequena escala a serem instaladas em relevos complexos que inclui áreas onde montanhas afetam o padrão de vento, como em grandes sistemas aquáticos localizados em regiões de planaltos. A influência da complexidade do relevo e da intensidade de turbulência foi investigada pela aplicação do método de Análise por Padrões de Gradientes em um modelo digital de elevação e uma série de dados histórica da direção e velocidade do vento. Os resultados indicaram que os padrões de fluxos são extremamente complexos e variam significativamente dependendo da direção do fluxo em sentido contrário. Esta variabilidade também torna difícil definir um plano zero de deslocamento ou um comprimento de rugosidade para um determinado ponto de medição, o que compromete a utilização do modelo de extrapolação vertical do vento baseado no coeficiente de rugosidade fixo.
ABSTRACT
As the demand for environmentally friendly energy production grows, there is also an increased interest in small scale wind turbines located in more complex relief that includes areas where mountains affect the wind pattern, as in large inland aquatic system localized close to hills. Influence of complex relief on the turbulence intensity was investigated by means of time series of the wind direction and speed and digital elevation model. The results indicated that the flow patterns are highly complex and vary significantly depending on the direction of the oncoming flow. This variability also makes it difficult to define a general zero plane displacement height or a roughness length for a certain measuring point. The resulting consequence for the usual one-dimensional wind profiles models are then pointed out.
Keywords: GPA. Roughness of the relief. Wind power.
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Copyright (c) 2016 Thiago Lobão Cordeiro, Arcilan Trevenzoli Assireu, Ramon Moraes Freitas, Nandamudi Lankalapalli Vijaykumar, Reinaldo Roberto Rosa
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