View source for Zero-plane displacement



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== zero-plane displacement ==
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#<div class="definition"><div class="short_definition">A height scale in [[turbulent flow]] over tall roughness elements associated  with the average level of action of [[momentum transfer]] between the flow and the roughness  elements.</div><br/> <div class="paragraph">In [[neutral stability]] the logarithmic [[wind profile]] becomes a straight line only if the vertical  axis is shifted by the zero-plane displacement length. Several formulas exist to relate this height  scale as a function of the roughness element geometry (for example, spacing and silhouette area).  Tabulated values for various surface types are published in most micrometeorological texts, for  example, Oke (1987). <br/>''See'' [[surface roughness]].</div><br/> </div>
#<div class="definition"><div class="short_definition">(''Also called'' displacement distance, displacement thickness.) In a viscous [[homogeneous fluid]],  the depth of a [[boundary layer]] of shearing flow over a flat plate.</div><br/> </div><div class="reference">Oke, T. R. 1987. Boundary Layer Climates. 2d ed., . 435 pp. </div><br/> 
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