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# Vertical Wind Profile - Power Law

## Description

The design of buildings must account for wind loads, and these are affected by wind shear. For engineering purposes, a power law wind speed profile may be defined by a formula that calculates the wind speed v2 at a certain height h2 in relation to an original height h1 and speed v1, assuming a power law vertical profile of wind speed function of the shear exponent α in turn depending on the site.

For neutral stability conditions, {\displaystyle \alpha } \alpha is approximately 1/7, or 0.143.

Related formulas

## Variables

 v wind speed at height z (m/s) vr known wind speed at reference height z_r (m/s) z height (m) zr reference height (m) α shear exponent (depends on the site) (dimensionless)