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Terrain Roughness Classification

This is a form of mechanical turbulence that occurs in the boundary layer of the atmosphere. It is caused by the frictional effects of air traveling over the earth’s surface. A relatively smooth, uncluttered ground will produce low levels of turbulence, while a rough ground will impart more turbulence into the moving air.

Terrain Type Roughness
Condition
Turbulence
Intensity
Ranking
Open Country, Flat Shoreline Smooth 0.07 4
Farmland, Scattered Trees & Buildings Smooth 0.12 3
Woodland, Suburb  Intermediate 0.22 2

 

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