Perfil vento com altura
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
α ≈ 0.2
About this calculator
The Wind Shear Profile Calculator estimates wind speed (v) at different heights (h) using a reference speed (v_ref) measured at a reference height (h_ref). The formula is v = v_ref × (h/h_ref)^α, where α is the wind shear exponent. This tool is crucial for wind energy projects, urban planning, or environmental studies, enabling predictions of how wind speed changes with altitude.
The exponent α typically ranges from 0.1 to 0.5, depending on atmospheric conditions and terrain. Under neutral conditions, α ≈ 0.2 is common. Rough surfaces or urban areas may increase shear. This calculator simplifies the exponential relationship, allowing non-experts to make quick projections.
Use it when comparing wind speeds at varying heights, such as for wind turbine placement or structural design. Avoid using the default α (0.2) without local adjustments, terrain or atmospheric stability can significantly alter actual wind patterns.
Frequently asked questions
What is the wind shear exponent?
The exponent α (alpha) describes how wind speed increases with height. Typical values range from 0.1 (smooth surfaces) to 0.5 (rough terrain).
How does the calculator apply the shear formula?
It uses the exponential relation v = v_ref × (h/h_ref)^α, where v_ref and h_ref are inputs, and α is adjusted for local conditions.
When should I adjust the default α value?
Adjust α for mountainous terrain, urban obstructions, or specific diurnal/nighttime conditions affecting wind patterns.
Why might my result differ from real-world measurements?
The model assumes ideal conditions. Deviations can occur due to ground roughness, abrupt elevation changes, or edge effects.