Detecção de sólidos e turbidez da água nos reservatórios Amador Aguiar I e II em Uberlândia/MG usando imagens de satélites Landsat 8, Modis e Sentinel 2

Abstract

This research addresses the use of satellite images to monitor water quality in its parameters of total solids and turbidity. With the objective of evaluating the use of remote sensing in the water quality in reservoirs, allowing a comprehensive, continuous and low cost monitoring. The study area is Amador Aguiar reservoirs II and I with 18.66km ² and 45.11m ² of flooded area, respectively, and are located in the low course of the Araguari river in the State of Minas Gerais. Eight samples were collected in each reservoir, in the months of November 2017 and January 2018, and analyzes were performed for quantification of total solids and turbidity. The results indicated that the surface waters in the sampled region were homogeneous. At each sampling point, the values of the pixels (processed reflectance) of the images of the three satellites used were analyzed in their spectral bands corresponding to the blue, green, red and near infrared (IRP) bands. The variations between the pixel values at the sample points were low, following the same pattern of solids and turbidity at these points. The analysis of variance anova was applied to verify if there were statistically significant differences for the values of total solids, turbidity and satellite reflectance. As a result, it was possible to establish polynomial equations that explain the relationship between total solids and turbidity with the pixel values of the bands in each satellite analyzed.