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Changes in Wind Speed Regime in Giurgeu Basin in the Past Decades. Changes in wind speed regime were observed in the Giurgeu Basin area after 1990. In this study we made a quantitative evaluation of wind speed in the region using basic statistical approach, trend evaluation, ranking system and frequency analysis. We succeeded to determine that a split year could be identified for both meteorological stations in the region, Joseni and Toplita. The wind speed regime shows a different evolution before and after these years enforcing that deforestation had an impact of this region. Using frequency analysis we could calculate the maximum wind speed values for different return periods. We also have the confirmation that a local microclimate exist in the basin existing a good correlation not only regarding the temperature, visibility, precipitation (revealed in other studies) but also in wind speed.

Keywords: wind speed, frequency analysis, deforestation, trend, correlation