Coastal erosion in the Paraíba do Sul River basin: a preliminary analysis of land use and sedimentary dynamics

Authors

  • Felipe Augusto Santos Master’s Degree in Natural Disaster, Researcher, National Centre for Natural Disaster Monitoring and Alerts, São José dos Campos, SP, Brazil https://orcid.org/0009-0001-9905-234X
  • Javier Tomasella PhD in Civil Engineering, Researcher, National Institute for Space Research, Earth System Science Centre, Cachoeira Paulista, SP, Brazil https://orcid.org/0000-0003-2597-8833

DOI:

https://doi.org/10.18472/SustDeb.v16n3.2025.58101

Keywords:

Trend analysis, Pluviometry, Fluviometry, Land use, Sediment transport

Abstract

The Paraíba do Sul River basin supplies major urban centres, such as São Paulo and Rio de Janeiro, and has been significantly impacted by urbanisation and multiple water uses. Over time, water demand has increased for the construction of hydropower dams and water-transfer systems. This research preliminarily examines how land-use changes and hydrometeorological trends have influenced sediment transport. We conducted an integrated analysis using sediment data from the National Water Agency (ANA) and land use data (1985–2021) from MapBiomas. Results show significant declines in river discharge and sediment load, likely due to reduced soil erosion from land-use changes, increased water demand, and reservoir flow regulation. Although coastal erosion at the river mouth is worsening, its causes cannot be attributed to basin disturbances, as coastal processes and climate change may also influence it. Given data limitations, the findings remain preliminary and require further observational and modelling studies.

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Author Biographies

Felipe Augusto Santos, Master’s Degree in Natural Disaster, Researcher, National Centre for Natural Disaster Monitoring and Alerts, São José dos Campos, SP, Brazil

Holds a degree in Chemistry from the University of Mogi das Cruzes (2015), a degree in Environment and Water Resources from the Faculty of Technology of Jacareí (2018), an MBA in Environmental Management from Anhanguera-Uniderp University (2021), a specialization in Environmental Engineering and Basic Sanitation from Anhanguera-Uniderp University (2022), a specialization in Socio-environmental Education and Sustainability from the Federal University of São Paulo (2024), and a master's degree in Natural Disasters from the São Paulo State University/National Center for Monitoring and Alerts of Natural Disasters (2024). Currently a researcher at the National Center for Monitoring and Alerts of Natural Disasters. Member of the Brazilian Forum on Climate Change.

Javier Tomasella, PhD in Civil Engineering, Researcher, National Institute for Space Research, Earth System Science Centre, Cachoeira Paulista, SP, Brazil

Holds a degree in Water Resources Engineering from the National University of the Littoral (1988) and a doctorate in Civil Engineering from the Institute of Hydrological Research (1995). Currently, he is a senior technologist at the National Institute for Space Research. His main areas of expertise include: hydrological modeling, the impact of land use and climate change on water resources, detection and modeling of extreme hydrological events, manipulation and desertification, and multidisciplinary research in water resources, with a focus on conflicts over water use. He is the first alternate member of the National Water Resources Council, representing the Ministry of Science, Technology, and Innovation (MCTI), and a full member of the Scientific Evaluation Chamber of the Interministerial Committee on Climate Change (CAC-CIM).

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Published

2025-12-28

How to Cite

Santos, F. A., & Tomasella, J. (2025). Coastal erosion in the Paraíba do Sul River basin: a preliminary analysis of land use and sedimentary dynamics. Sustainability in Debate, 16(3), 261–274. https://doi.org/10.18472/SustDeb.v16n3.2025.58101

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