525
Soil and Vegetation Moisture Changes for Forest Fire Events
TABLE 21.4
Typical NMDI Ranges for Vegetation and Soil under Dry and Wet Conditions
Moisture Condition
NMDI
NMDI
m
m
m
m
m
=
⋅
−
⋅
− ⋅
⋅
+
⋅
−
R
R
R
R
R
0
1
2
0
1
86
64
13
86
64
µ
µ
µ
µ
µ
(
)
(
R R
2 13
⋅ µm)
NMDI
m
m
m
m
soil =
−
⋅
−
⋅
− ⋅
⋅
+
0 9
86
64
13
86
0
1
2
0
.
(
)
(
R
R
R
R
µ
µ
µ
µ
R R
R
1
2
64
13
⋅
− ⋅
µ
µ
m
m)
Vegetation
Soil
Extremely dry
<0.2
0.7–0.9
<0.2
Dry
<0.4
>0.5
<0.4
Wet
0.4–0.6
0.3–0.5
0.4–0.6
Extremely wet
>0.6
<0.3
>0.6