Identification and analysis of susceptible areas to debris flow in the Taquari-Antas River basin, RS

Abstract

The aim of this paper was to identify and analyze the susceptible areas to debris flow in the Taquari-Antas River basin. We developed a spatial modeling with probabilistic approach involving the morphometric analysis in areas with occurrence of debris flow for the mapping of susceptible areas. The sites were inventoried from satellite images and on-site expeditions, have been mapped 193 scars. Most scars refer to the event occurred in January 2010, in the Forqueta river basin. We defined three morphometric attributes for modeling: (i) the average slope filtered in 5x5 window; (ii) altimetry slope of the ramp; (iii) altimetry slope of the hill. These attributes showed a well-de