Determinação da área efetivamente inundada durante o evento extremo de 2017, no município de Itaqui, RS, através de técnicas de sensoriamento remoto

Abstract

Satellite image processing techniques have been contributing to the detection of flood areas. This study aimed to determine the area effectively flooded in the extreme event of 2017, for the territory of the municipality of Itaqui-RS, using remote sensing techniques, comparing different indices. Usage and level data for the years 2016 and 2017 were used to prove the highest quota and demonstrate that there was no rainfall that interfered with the river level, as well as images from the Landsat-8 satellite from the 8th June 2016 and 11th July 2017 for the calculation. and comparison of NDVI, NDWI, MNDWI and NDPI indices. It was verified that the MNDWI and NDPI indices had minimal difference in the values of effectively flooded area, while the NDVI had the largest discrepancy, being possible to affirm that the use of this technique is efficient, having as the indicated indices the MNDWI and NDPI, for the good contrast, both bodies of water and vegetation, contributing to their identification.