<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>T. E. A. Van Hylckama</dc:creator>
  <dc:date>1970</dc:date>
  <dc:description>&lt;p&gt;An analysis of hourly wind speeds above and within a stand of saltcedar near Buckeye, Arizona, reveals that in 90% of all observed cases, the wind profiles above the stand can be represented by the simple logarithmic equation:&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="math"&gt;&lt;span id="MathJax-Element-1-Frame" class="MathJax_SVG" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mtext&gt;u&lt;/mtext&gt;&lt;msub&gt;&lt;mi&gt;&lt;/mi&gt;&lt;mn&gt;z&lt;/mn&gt;&lt;/msub&gt;&lt;mtext&gt;=&lt;/mtext&gt;&lt;mtext&gt;u*&lt;/mtext&gt;&lt;mtext&gt;k&lt;/mtext&gt;&lt;mtext&gt;1&lt;/mtext&gt;&lt;mtext&gt;n&lt;/mtext&gt;&lt;/math&gt;"&gt;&lt;span class="MJX_Assistive_MathML"&gt;uz=u*k1n&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(&lt;span class="math"&gt;&lt;span id="MathJax-Element-2-Frame" class="MathJax_SVG" data-mathml="&lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&gt;&lt;mtext&gt;z&lt;/mtext&gt;&lt;mtext&gt;z&lt;/mtext&gt;&lt;msub&gt;&lt;mi&gt;&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msub&gt;&lt;mtext&gt;)&lt;/mtext&gt;&lt;/math&gt;"&gt;&lt;span class="MJX_Assistive_MathML"&gt;zz0)&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;where u&lt;sub&gt;z&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;is the velocity at height z. The roughness length (z&lt;sub&gt;0&lt;/sub&gt;), (disregarding zero displacement), varies with a stability ratio similar to Richardson's number. The friction velocity,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;u*&lt;/i&gt;, depends on the wind speeds above the vegetation. Von Karman's constant, k, equals 0.41.&lt;/p&gt;&lt;p&gt;Within the thickets there is considerable turbulence, and irregular wind inversions occur during daylight hours.&lt;/p&gt;&lt;p&gt;The results are important for estimating water losses by evapotranspiration by either the energy-budget or the mass-transfer formulae.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/0002-1571(70)90018-X</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>Winds over saltcedar</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>