Diagnosis and Qualitative Estimation of the Hydric Erosion in Watershed of Talangaï (Brazzaville) by the Application of Geographical Information System (GIS)

This research work exposes the results of our study about cartographic and qualitative estimation hydric erosion watershed talangaï (Brazzaville) following PAP/RAC approach, tele detection’s data geographical information system in order to elaborate thematic cards by enlightening phenomenon. In this talangaï, phenomenon became recurrent causes more spectacular worrings. As a matter fact, except climatic aspects zone, is characterized large irregularity precipitations, steep slope, weak vegetable coverage; which renders it very vulnerable erosion. Thus, after analysis treatment collected data, from (GIS), shows that 65% zone present average erodibility 35% high highest erodibility. Likewise, descriptive cartography different forms erosions ravine surface table-cloth are most current. Also, consolidated card states way soil loss relationship with its geomorphology. short, combining principle erosive states, synthesis has been done producing these (Integration approach). All unfavorable conditions; slopes; geomorphology; erodibility; friability soils, vegetal covert …), triggering catastrophe fulfilled. obtained allow identify zones concerned, erosions.