This research is a contribution of indirect analyses to classic geological and structural mapping. The principles of this analysis is to combine structural streams and structural directions in the goal to find structural building of streams network. Streams were numerized under Arcview and the data of each stream was done. Frequency graphics of number and total length of streams on Strahler classification were built and interpreted with “lois des rivières”. Recognition of Structural directions was done by the building of Prud’homme main valleys and Howard drainage anomalies.
Structural streams have affected by at least point 5 in hierarchy. They are held by N30°, N60°, N130°, N160° orientations. This methodology can be applied at all ivoirian drainage system due to their tree buliding. The main valley is host by N60° direction. Others valleys are holding by N30° N130° et EO. in the landscape, structural directions are sitting as drainage anomalies as directions deviations and linear streams. These directions are well knowed in ivoirian precambrian structural context.
The current work aims to map the different forms of erosion which are expressed in the district of Attecoube. From georeferenced aerial photographs and based on the concepts of texture and structure, the different forms of erosion were discriminated on the screen. Many field visits, with tablets, GPS and tape measure (for measurements) allowed checking and adjusting the interpretations made on screen. These high-tech devices were also used for capturing images. Then, we superimposed the erosion forms map at the slopes map of the study area. Three main forms of erosion were revealed:
- diffuse erosion covers 14,32% of the study area;
- gully erosion which manifest itself on every slope range, covers 66.39% of the Attecoube district;
- mass wasting localised, cover only 06.82% of the study area.
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