Hydrologylec14_evap_meas

6 e 1 1862 e rn net radiation in mmday rate

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(0.066
kPa
K‐1)
 varies
with
pressure,
and
the
latent
heat
of
 Where: vaporiza+on
 C – heat capacity of air MJ kg K a -1 -1 P - pressure kPa λv – latent heat of vaporization MJ kg-1 € € Mass
Transfer
Approaches 
 Combina+on
Approach
(Penman) 
 •  Make
direct
use
of
Dalton
type
equa+on
 E
=
(b0
+
b1
va)
x
(es‐ea)
 Where
bn
are
empirical
constants
that
depend
 on
the
height
at
which
wind
speed
and
water
 vapour
are
measured
to
reflect
the
efficiency
 of
ver+cal
transport
 
va
(windspeed
m/s)
and
es‐ea
are
the
saturated
 and
actual
vapour
pressures
in
kPa
 •  Penman
(1948)
worked
to
demonstrate
the
 mass
transfer
and
energy
balance
approaches
 could
be
combined
to
yield
an
equa+on
not
 requiring
surface
temperature
data
 ΔRn * +...
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This note was uploaded on 10/22/2012 for the course GEOG 3610 taught by Professor Berg during the Spring '11 term at University of Guelph.

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