Identificação das vulnerabilidades a desastres por inundações relacionadas ao canal da transposição do Rio São Francisco na região de Monteiro - PB

Abstract

This research aimed to identify the vulnerabilities to risk of flood disasters related to the overflow of water from the São Francisco river transposition channel in the municipality of Monteiro-PB. The study area of this work was the city's urban perimeter, inserted in the margin of the works of the east axis of the transposition. The methodology applied was descriptive quantitative cross-sectional, with field visits for data collection and dimensioning of areas susceptible to flooding in case of overflow of the structure. To delineate the areas prone to risk of flood disasters, the Height Above the Nearest Drainage (HAND) terrain descriptor model was used, which uses the Digital Elevation Model (DEM) as the only input data. The DEM used in the study area was obtained from available satellite images from the ALOS PALSAR mission. Defining as study parameters, overflow projections of the transposition channel were established, graduated at 0.5 m, 3 m and 5 m, above the edge of the channel in the study area. As a result, the images showed that such projections show an acceptable degree of safety of the channel structure, where damage caused by possible flooding resulting from the overflow does not severely affect the urban area. Thus, the study was able to delimit the areas affected by the flood simulations, grading the areas in risk levels, being able to support the government in decision-making in actions to prevent and mitigate damages.