Comparison between two soil erosion risk models
Soil erosion risk in the Gina River catchment was estimated applying two different approaches:
- Firstly, a semi-quantitative approach that uses calculations to estimate soil erosion risk within the Gina River catchment.
- Secondly, a qualitative approach neglecting arithmetic methods to receive an overview of the soil erosion risk.
The both resulting maps show similar pattern of soil erosion risk areas.
Areas of high erosion risk are:
- north-east part;
- parts of the north-west;
- the southern parts of central west;
- smaller parts in the very west of the Gina River catchment.
Areas showing low erosion risk are:
- the weakly sloped areas around the settlement Mesho in the central region;
- south-eastern parts of the drainage basin.
Differences between the two approaches existing simply in degree of generalising. The map which was generated by the qualitative approach is highly generalising while the map resulting from the semi-quantitative approach is characterised by a high spatial distribution.
And the qualitative approach has an advantage not to be ignored: this approach enables the possibility to link a multiply of factors with each other and analyse them in more detail.
Having assessed the actual soil erosion risk in the Gina River catchment by using these two approaches the future soil erosion risk will be predicted (on the base of the semi-quantitative approach) under assumption specific conditions in the Gina River catchment. The next pages will introduce you to the development of scenarios relevant for decision making in planning.