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Publication
Remote sensing for water quality monitoring - a case study for the Marateca reservoir, Portugal
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Advisor(s)
Abstract(s)
Continuous monitoring of water resources is essential for ensuring sustainable urban water
supply. Remote sensing techniques have proven to be valuable in monitoring certain qualitative
parameters of water with optical characteristics. This survey was conducted in the Marateca reservoir
located in central inland Portugal, after a major event that killed a considerable number of fish. The
objectives of the study were as follows: (1) to define a pollution spectral signature specific to the
Marateca reservoir that could shed light on the event; (2) to validate the spectral water’s quality
characteristics using the data collected in five gauging points; and (3) to model the characteristics
of the reservoir water, including its depth, trophic state, and turbidity. The parameters considered
for analysis were total phosphorus, total nitrogen, and chlorophyll-a, which were used to calculate
a trophic level index. Sentinel-2 imagery was employed to calculate spectral indices and image
ratios for specific bands, aiming at the definition of spectral signatures, and to model the water
characteristics in the reservoir. The trophic level index acquired from each of the five gauging points
was used for validation purposes. The reservoir’s trophic level was classified as hypereutrophic and
eutrophic, indicating its sensitivity to contamination. The developed methodological approach can
be easily applied to other reservoirs and serves as a crucial decision-making tool for policymakers.
Description
Keywords
Trophic level index Spectral indices change Spectral signatures Random forest algorithm
Citation
ALEGRIA. C.M.M. ; ALBUQUERQUE, M.T.D. (2023) - Remote sensing for water quality monitoring : a case study for the Marateca reservoir, Portugal. Geosciences. 13, 259. DOI: 10.3390/geosciences13090259
Publisher
MDPI