Modification of normalised difference water index (NDWI) to enhance open water features in remotely sensed imagery

This research seeks to identify the change of the Amazon River channel between 2015 and 2022 and its effects through analysis and modeling of the dynamics of the water body, on the banks and surrounding plains, with emphasis on the municipality of Puerto Nariño.The municipality, as documented, has been directly exposed to the riverbed since 2020 due to the loss of a natural barrier, and the analyses carried out in this research contribute to risk management studies and land use plans that carry out prevention plans for the identified areas which, according to the natural behavior of the river, will be eroded areas in the future, with constant landslides and destabilized trees of great magnitude that represent a danger for the surrounding populations.The present research makes use of Geographic Information Systems applied to Landsat 8 satellite images with processing level 2 and the Modified Normalized Difference Water Index MNDWI, whose classification of water bodies over any other coverage is more effective than the classification achieved with the NDWI index, which facilitated the identification of the channel for the modeling of the dynamics in the proposed years