Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

• the most efficient way to navigate the Engineering ToolBox!

# Wind Shear

Sponsored Links

Wind velocity increases with altitude and wind moving close to Earth's surface is slowed down by obstructions like buildings, trees and similar. Wind slow down along the surface is "wind shear".

Wind shear can be expressed as

v / vo = (h / ho)α                                             (1)

where

v = the wind speed at height h (m/s)

vo = the wind speed at height ho (m/s)

α= the wind shear exponent

The wind shear exponent varies with the terrain.

Wind Shear Exponent vs. Terrain
TerrainWind Shear Exponent
- α -
Open water 0.1
Smooth, level, grass-covered 0.15
Row crops 0.2
Low bushes with a few trees 0.2
Heavy trees 0.25
Several buildings 0.25
Hilly, mountainous terrain 0.25

### Example - Wind Speed in a Terrain with Several Buildings

With a Wind Shear Exponent 0.25 and wind velocity at level 10 m measured to 5 m/s -  wind sped at level 40 m can be estimated by transforming (1)

v = (h / ho)α vo                                            (1b)

Substituting with values

v = ((40 m) / (10 m))0.25 (5 m/s)

= 7.1 m/s

Sponsored Links

## Related Topics

### • Environment

Climate, meteorology, solar, wind, emissions and environmental related engineering resources.

### • Fluid Mechanics

The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.

## Related Documents

### Wind Energy

Available wind energy.

### Wind Load vs. Wind Speed

Wind load on surface - Wind load calculator.

### Wind Power

Power generation from wind.

### Wind Turbine Power Calculator

Online wind turbine calculator.

Sponsored Links

## Search Engineering ToolBox

• the most efficient way to navigate the Engineering ToolBox!

## SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

## Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.