The analysis of topography is very important when choosing a site. This is an important point when mountainous locations are under consideration. For those
TABLE 4.2 Estimation of Wind Speed (Beaufort Table)
areas, the wind speed increases on the front side of the mountain and decreases on the opposite side. In plane areas, the position of tree barriers should be observed with respect to the wind, as their proximity to the place chosen for turbine installation is critical. There should be a maximum of free space between tree barriers and the power plant, to avoid any slowing down of the wind (see Section 4.3).
With increased altitude, the movement of a wind draft takes a more complex form, due to different land shapes. Thus, it is necessary to have a reasonable knowledge of the characteristics of the soil to be occupied. The roughness of the ground surface causes wind shear, which changes significantly with altitude. Some data collected at Merida Airport in Mexico show that the wind speed can be four to five times higher at an altitude of about 450 m with respect to the ground surface, and then it starts to decrease again . At about 100 m from the surface, many
places on Earth have a wind speed sufficient for wind energy, but the costs of such high installation severely limit a decision in favor of using such heights.