Source: wikibot/roughness-length
= Roughness length
{wiki=Roughness_length}
Roughness length, often denoted as \\( z_0 \\), is a parameter used in boundary layer meteorology and fluid dynamics to characterize the effect of surface roughness on wind flow or other fluid flows near a surface. It is defined as the height above the surface at which the wind speed theoretically becomes zero due to friction from the surface's roughness elements (like buildings, trees, hills, etc.).