1 Spatial Modelling of the Terrestrial Environment - Georeferencial

Modelling Wind Erosion and Dust Emission on Vegetated Surfaces 145
Table 7.3
SWEMO input parameters for soils of the Jornada Basin
Texture Sandy loam Loamy sand Clay loam Gravelly sand
u ∗ts (cm s −1 ) 29 34 68 28
Log(F a /Q tot (cm −1 )) −3.7 −4.5 −5.7 −5.7
A 1.0 1.0 1.0 1.0
Spatially-Explicit Wind Erosion and Dust Flux Model
(SWEMO)
Vegetation
Map
Soil
Map
Wind speed data
Reproject to
soil map projection
Create histogram
wind speed
Parameter lookup
file containing info
on each plant community
Parameter lookup
file containing info
on each soil type
Create maps of:
U *ts , Z 0 , A, σ,
β, λ, & F a /Q tot
Calculate histogram of
Derive map of U *t
U * for each cell
Calculate
Q tot for each cell
Calculate F a for
each cell
Figure 7.3
(SWEMO)
Processing stream for the spatially explicit wind erosion and dust flux model
disturbance, a road, a dry river or a dry lake, may account for the majority of dust emitted
in an area, but be insignificant on the scale at which most maps are produced.
In the present study, a site with all requisite data (soil maps, vegetation maps, wind data
and a wealth of ongoing ecological research) was chosen to test SWEMO. The Jornada