TEMPORAL ANALYSIS OF BIO-OPTICAL INDICATORS RELATED TO WATER QUALITY AT SEIXAS BEACH, NORTHEASTERN BRAZIL: AN EXPLORATORY STUDY USING SENTINEL-3 OLCI

Autores

DOI:

https://doi.org/10.66104/necb7q37

Palavras-chave:

Bio-optical indices, coastal monitoring, OLCI, remote sensing, water quality

Resumo

This study investigates the temporal behavior of bio-optical parameters related to water quality at Seixas Beach, Paraíba, Brazil, using remote sensing data from the Ocean and Land Colour Instrument (OLCI) onboard Sentinel-3. The area is a shallow tropical coastal environment influenced by seasonal rainfall, estuarine discharge, and urban inputs, making it suitable for evaluating satellite-based monitoring in optically complex waters. The study assumes an exploratory character, focusing on the interannual variability of optical proxies between October 2016 and January 2020, a period chosen to represent conditions of lower rainfall and greater water column stability. Six indices were analyzed: Bottom Reflectance Index (BRI), Normalized Difference Chlorophyll Index (NDCI), Normalized Floating Algal/Harmful Algal Bloom Index (NFHI), Turbidity Index (TBI), Algal Carbon Index (ACI), and Sea Surface Temperature (SST). The results reveal consistent spatial gradients between nearshore and offshore zones. Statistical analysis indicated significant interannual differences for BRI and TBI, suggesting variations in apparent transparency and suspended particle influence. Given the absence of in situ data, the results are interpreted as indicative of changes in the region’s optical regime. The study establishes a methodological baseline for using OLCI as a screening tool in monitoring tropical coastal environments in northeastern Brazil.

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Biografia do Autor

  • Mariana Mirelly da Silva Sá, Federal University of Paraíba

    Holds a Bachelor’s degree in Fisheries Engineering from the State University of Bahia (UNEB, 2021), a specialization in Occupational Safety Engineering from the National Institute of Education and Research (INEP, 2022), and a Master’s degree in Ecology and Environmental Monitoring from the Federal University of Paraíba (PPGEMA/UFPB, 2023). Currently pursuing a Ph.D. in Development and Environment at PRODEMA/UFPB, including a doctoral exchange program at the University of Trás-os-Montes and Alto Douro (UTAD), Portugal, funded by the CAPES/PDSE scholarship program. Has experience in Agricultural and Earth Sciences, particularly in Geology and Sedimentology, with current research interests focused on Environmental Technologies, Remote Sensing, Artificial Intelligence, Spatial Modeling, and Coastal Area Management. Also serves as an Inland Waterway Deck and Engine Assistant Seafarer certified by the Brazilian Navy (2019) and participated in an educational exchange program at Mount Hutt College, Methven, New Zealand (2014), through the “Ganhe o Mundo” scholarship program funded by the Government of Pernambuco State.

         
  • Raimundo Aprigio de Menezes Junior, Federal University of Paraíba, Brazil

    Holds degrees in Civil Engineering (Federal University of Paraíba, 2005) and Dentistry (Federal University of Paraíba, 2009), as well as Master’s and Ph.D. degrees in Mechanical Engineering with emphasis on Dynamics and Control Systems (Federal University of Paraíba, 2008 and 2012). Served as a full-time professor at the Federal University of Pernambuco between 2010 and 2012. Currently, is an Associate Professor III at the Federal University of Paraíba under an exclusive dedication regime, conducting research in the following areas: Numerical Methods (theoretical models using serial and parallel scientific computing), Artificial Intelligence and Data Intelligence (Machine Learning, SVM-based theoretical models, Artificial Neural Network models, and analytical modeling), Biomechanical Problem Modeling and Material Characterization, Static and Dynamic Structural Problem Modeling (Control and Artificial Intelligence applied to active systems), Embedded Systems Technologies for IoT and Sensing, and Alternative and Renewable Energy Sources.

  • Karina Massei, Federal University of Paraíba, Brazil

    Marine Biologist graduated from UNISANTA, with a Master’s degree from the University of Algarve (Portugal) and a Ph.D. from PRODEMA/UFPB. Specialist in Environmental Education, with experience in coral reef and mangrove ecology and monitoring, marine ecosystem restoration, integrated coastal management, and environmental education. Currently coordinates the Coral Ecosystem Restoration Subprogram (SUPER/PREAMAR-PB), participates in national coral restoration networks, and contributes to initiatives related to the Ocean Decade and Marine Spatial Planning in Northeastern Brazil. Has experience in project development and management, event organization, capacity building, and strengthening the connection between science, public policies, and society.

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Publicado

2026-06-07

Edição

v. 13 n. 12 (2026): REMUNOM - ISSN 2178-6925

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Artigos

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Copyright (c) 2026 Mariana Mirelly da Silva Sá, Raimundo Aprigio de Menezes Junior, Karina Massei

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Como Citar

TEMPORAL ANALYSIS OF BIO-OPTICAL INDICATORS RELATED TO WATER QUALITY AT SEIXAS BEACH, NORTHEASTERN BRAZIL: AN EXPLORATORY STUDY USING SENTINEL-3 OLCI. (2026). REMUNOM, 13(12), 1-22. https://doi.org/10.66104/necb7q37