The EOSOLAR project was designed to investigate the structure of the atmospheric boundary layer in an equatorial coastal zone, where the discontinuity of surface conditions induces non-stationarity gradients of wind speeds and the development of internal boundary layers. The proposed methodology considers several aspects of the sea–land transition meteorology that are essential for precisely estimating wind–solar energy potential and assessment of structural loads on wind turbines. Infrared (LIDAR) and acoustic (SODAR) ground-based remote sensing instruments and micrometeorological towers were installed in a near-shore equatorial area of northeast Brazil, in order to provide a comprehensive view of meteorological processes. This paper reports a description of the project study area, methodology, and instrumentation used. Details of instruments configurations, a validation of micrometeorology towers, and a comparison between the LIDAR and SODAR are presented. Results of the first field campaign measuring the coastal flow, integrating the micrometeorological tower and LIDAR observations are described.
This article seeks to compare the performance of a LIDAR Windcube V2, manufactured by Leosphere, with that of a SODAR MFAS, manufactured by Scintec, in evaluating wind speed at different altitudes. The data from these two sensors were collected at three locations on the Brazilian equatorial margin in the state of Maranhão. The comparison of these sensors aims at their simultaneous use at different points. The horizontal velocity components, by altitude, showed Pearson correlation values above 0.9 and values for the vertical velocity component between 0.7 and 0.85. As for the sampling efficiency, the LIDAR had a performance slightly higher than that of SODAR, especially at the point closest to the coast. In general, both sensors showed similar values, despite the differences in sampling methods. The results showed that the joint performance of these sensors had good correlation, being reliable for application in estimating wind potential for power generation in coastal areas of the equatorial region.
In this article, is proposed to identify the methods for estimating aerodynamic roughness length (z 0 ) best suited to feasibility studies for the construction of wind farms. For that, a systematic review is carried out to filter the latest works that apply different methods to find z 0 values. Identifying z 0 for a specific surface is important to simulate the vertical wind profile and mechanical and turbulent fluxes estimation in the atmospheric surface layer. Must be considered those factors in viability studies for a wind farm, therefore impacting the calculation of energy efficiency. Morphometric and micrometeorological methods are listed, besides presenting works that have developed tables with z 0 optimal values for different types of land. In the end, situations are presented in which each method has better applicability. Resumo: Neste artigo, se propõe identificar os métodos de estimativa de comprimento de rugosidade aerodinâmica (z 0 ) mais adequados a estudos de viabilidade para construção de parques eólicos. Para tal, foi realizada uma revisão sistemática com o intuito de filtrar os trabalhos mais recentes que aplicam diferentes metodologias para encontrar valores de z 0 . A identificação do z 0 para uma superfície específica é importante para simular o perfil vertical do vento e estimar fluxos mecânicos e turbulentos na camada superficial da atmosfera. Esses fatores devem ser considerados em um estudo de viabilidade de um parque eólico, pois causam impacto no cálculo da eficiência energética. São listados os métodos morfométricos e micrometeorológicos, além de apresentar os trabalhos que desenvolveram tabelas com valores ótimos de z 0 para diferentes tipos de terrenos. Ao final são apresentadas as situações em que cada método tem melhor aplicabilidade.
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