## roughness length

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*Also called*roughness coefficient.) A measure of the roughness of a surface over which a fluid is flowing, defined as follows:*z*_{0}is the roughness length and ε is the average height of surface irregularities.From Glossary of Meteorology

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(*Also called* roughness coefficient.) A measure of the roughness of a surface over which a fluid is flowing, defined as follows: where *z*_{0} is the roughness length and ε is the average height of surface irregularities.