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M<strong>as</strong>s Transfer (Aerodynamic) Method<br />
• Assumes that rate of<br />
turbulent m<strong>as</strong>s transfer of<br />
water vapor from<br />
evaporating surface to<br />
atmosphere is limiting factor<br />
• M<strong>as</strong>s transfer is controlled<br />
by (1) vapor gradient (e s – e)<br />
and (2) wind velocity (u)<br />
which determines rate at<br />
which vapor is carried away.<br />
E<br />
B(<br />
u)<br />
<br />
B(<br />
u)<br />
B(<br />
u)(<br />
e<br />
s<br />
0.102u<br />
<br />
ln<br />
z<br />
<br />
<br />
e(<br />
z))<br />
2<br />
z<br />
o<br />
<br />
<br />
<br />
2<br />
u<br />
0.0027(1 )<br />
100
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