Avaliação das construções danificadas por corridas de detritos e inundações bruscas no Vale do Ribeira (SP) em 2014

Abstract

The present study quantify the number of buildings affected by natural flow events such as debris flows, mud flows and the consequent flash floods which took place at the municipalities of Itaoca and Apiaí, Vale do Ribeira, in January 2014. The pathway of the natural flow and flash flood events of 2014 was mapped through the distribution of unconsolidated deposits over the built areas. Tools such as the historical images of Google Earth (from August 2014), orthophotos, photographs of the same year and fieldwork enabled the visualization of events and buildings according to the following methodological steps: 1) Mapping of buildings prior of the events; 2) Mapping of flows and flash flood events in 2014; 3) Systematization of data and quantification of the hit builds. In all, 1,221 buildings were mapped out of which 565 were directly hit by the flows or flash floods. Preliminary results show the density of buildings in triggering events area increase the quantity of hit risk elements; the impacts over the constructions are conditioned by the variability of the hazardous processes.