INCA
INCA soil erosion model requires the following land use specific model parameters (inca_table):
Table 33: inca_table
-99
1
2
3
4
1
8.5
0.65
0.7
0
2
5
0.35
1.5
0
3
3.5
0.3
5
0
…
…
The vegetation cover (V) is similar to the canopy cover of the other soil erosion models, but multiplied with a factor 10. The vegetation cover is determined by LAI ∙ 10 in case the vegetation module is used. The ground cover (Cg) and “no erosion” columns are similar to the ones used by MMF. The calibration parameter a4 is described below.
The soil erodibility for splash (ESP) and flow erosion (EFL) can be used for model calibration and have default values of 0.005 kg m-2 s-1 and 0.003 kg km-2 s-1.
The splash detachment scaling parameter CX1 is a constant with a value of 3 s m-1.
The model parameters a1-a6 include constants and parameters that can be used for model calibration. The constants include a2 (=0 m2 s-1), a3 (=0.15) and a5 (=0 m2 s-1). The other parameters can be used for model calibration. The calibration parameter a4 can be given as a fixed value for all model domain or be land use specific using inca_table (Table 33).
Table 34: Model parameters
Vegetation cover
V
-
0-10
Ground cover
Cg
-
0-1
No erosion
-
0 or 1
Soil erodibility for splash erosion
ESP
kg m-2 s-1
0.005
Soil erodibility for flow erosion
EFL
kg km-2 s-1
0.003
Splash detachment scaling parameter
CX1
s m-1
3
Flow erosion scaling factor
a1
s m-2
7-15
Flow erosion direct runoff threshold
a2
m2 s-1
0
Flow erosion non-linear coefficient
a3
-
0.15
Transport capacity scaling factor
a4
kg m-2 km-2
0.7-10
Transport capacity direct runoff threshold
a5
m2 s-1
0
Transport capacity non-linear coefficient
a6
-
0.73-0.9
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