Contribution on Debris Flow Forecast

Debris flows are known as one of nature's most catastrophic mass movements, depending on speed, power and high volume. The analysis of the conditioning agents and triggers of this mass movement provides an assessment of each of the factors involved in the slope instability processes, allowing the obtainment of interesting results, regarding its form of action. This work aims to develop a new technique for evaluating and predicting debris flows. Consists of generating maps of slope stability and natural susceptibility to debris flows through geotechnologies, associated with remote sensing data. The chosen case study was the Córrego D'Antas basin located in the mountainous region of Rio de Janeiro and was greatly affected by the debris flows triggered after the extraordinary precipitation event in January 2011. The results obtained were compared with the real characteristics of the event, indicating consistent analyzes that support the use of this methodology for risk analysis and, consequently, assessment of occupancy scenarios and projects of coexistence structures and debris flow mitigation.

Keywords: Debris flow, Geotechnologies, Remote sensing, Risk analysis.