Geography Reference
In-Depth Information
3.3.3. Erosion risk mapping
Finally, the erosion risk map (Figure 4) was obtained by relating the erosive status and MFI
classified according to CORINE-CEC (1992). According to Zavala (2001), five levels of
erosion risk were set: 1- Very Low, 2- Low, 3- Moderate, 4- High and 5- Very High. Erosion
risk was expressed in terms of erosive status and MFI (Corine-CEC, 1992) (Table 7).
MFI (Corine-CEC)
Erosive status
1
2
345
1
1
1
1
2
3
2
1
2
2
3
4
3
1
2
3
4
5
4
2
3
4
4
5
5
3
4
5
5
5
Table 7.
Determination of the levels of erosion risk as a function of the erosive status and the rainfall
aggressivity.
Figure 4.
Digital model of the annual risk of erosion of the Serra de Grândola.
3.4. Results and discussion
3.4.1. Erosive status map
Each erosive status class was characterized according to the slope, soil and vegetation cover
(Table 8).
