Emprego de sensoriamento remoto nas estimativas de concentração de sedimentos em água
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2019-09-24
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Universidade Federal de Goiás
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Suspended sediments in rivers and on the coastline affects the hydrological, geomorphological and ecological aspects of flood plains and deltas. Traditional SSC insitu measurement is most often challenging in terms of time, cost, qualified personnel, and space coverage. Remote satellite sensing offers a convenient way to cover large areas at reasonable intervals of time. The objective of this study is to develop an approach to the use of public accessible satellite images to quantify the concentration of suspended sediments (SSC) in Brazilian rivers, watersheds and coastline. In addition to obtaining historical trends, for a better understanding of the CSS variations that have occurred over the past three decades. The approach used in the articles present in this thesis makes use of indexes derived from the reflectance values of the spectral bands of the satellite images in order to estimate the value of SSC present in rivers, coast and watersheds, making use of values measured in situ for the calibration of such values. The present thesis consists of the introduction to the topic, methods and four articles, the first article makes a general approach to the current state of the art for the derivation of SSC values through indexes derived from the reflectance values of the spectral bands of satellite images. The second article makes use of SSC estimation techniques to study the sediment concentration variations in water along the Araguaia River. The third article makes a temporal analysis of SSC variations in the Brazilian basins in the last 32 years. The fourth article presents a new methodology for the temporal analysis of the SSC variations along the entire Brazilian coastline for the last 32 years. Among the main innovations present in this thesis we can highlight: 1) Estimation of SSC throughout the entire Brazilian territory, together with historical trends. 2) Use of LandSat family of terrestrial satellites to estimate the concentration of SSC for the entire Brazilian coast, at a distance of up to 50 km from the Brazilian coast, also with historical trends.
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HOLDEFER, A. E. Emprego de sensoriamento remoto nas estimativas de concentração de sedimentos em água. 2019. 111 f. Tese (Doutorado em Ciências Ambientais) - Universidade Federal de Goiás, Goiânia, 2019.