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The Rural Fires of 2017 and Their Influences on Water Quality: An Assessment of Causes and Effects

Author

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  • Mário David Sequeira

    (Department of Earth Sciences, Centre for Social Studies, University of Coimbra, 3030-790 Coimbra, Portugal)

  • Ana Castilho

    (Department of Earth Sciences, Geosciences Centre, University of Coimbra, 3030-790 Coimbra, Portugal)

  • Alexandre Oliveira Tavares

    (Department of Earth Sciences, Centre for Social Studies, University of Coimbra, 3030-790 Coimbra, Portugal)

  • Pedro Dinis

    (Department of Earth Sciences, MARE–Marine and Environmental Sciences Centre/ARNET-Aquatic Research Network, University of Coimbra, 3030-790 Coimbra, Portugal)

Abstract

As water is facing increasing pressures from population and economic growth and climate change, it becomes imperative to promote the protection, restoration and management of this resource and its watersheds. Since water quality depends on multiple factors both natural and anthropic, it is not easy to establish their influences. After the October 2017 fires that affected almost 30% of the Mondego hydrographic basin in Central Portugal, 10 catchments were selected for periodic physical-chemical monitoring. These monitoring campaigns started one month after the fires and lasted for two hydrological years, measuring the electric conductivity (EC), pH, dissolved oxygen (DO), turbidity (Turb), alkalinity (Alk), major and minor ions, and trace elements. The obtained data were then statistically analysed alongside the geomorphological characteristics of each catchment coupled with features of land-use and occupation. From the results, it was possible to establish that fire-affected artificial areas, through the atmospheric deposition and surface runoff of combustion products, had the most impact on surface water quality, increasing As, K − , Ca 2+ , Mg 2+ , NO 3 − , SO 4 2− and Sr, and consequently increasing electrical conductivity. Agricultural land-use seems to play a major influence in raising the water’s EC, Cl, K − and Na 2+ . Regarding natural factors such as catchment geology, it was found that the extent of igneous exposures influences As, and the carbonate sedimentary units are a source of Ca 2+ and HCO 3 2− concentrations and impose an increase in alkalinity. Rainfall seems, in the short term, to increase the water concentration in Al and NO 3 − , while also raising turbidity due to sediments dragged by surface runoff. While, in the long-term, rainfall reduces the concentrations of elements in surface water and approximates the water’s pH to rainfall features.

Suggested Citation

  • Mário David Sequeira & Ana Castilho & Alexandre Oliveira Tavares & Pedro Dinis, 2022. "The Rural Fires of 2017 and Their Influences on Water Quality: An Assessment of Causes and Effects," IJERPH, MDPI, vol. 20(1), pages 1-12, December.
    • Handle: RePEc:gam:jijerp:v:20:y:2022:i:1:p:32-:d:1009278
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    References listed on IDEAS

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    1. Azam Haidary & Bahman Amiri & Jan Adamowski & Nicola Fohrer & Kaneyuki Nakane, 2013. "Assessing the Impacts of Four Land Use Types on the Water Quality of Wetlands in Japan," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 27(7), pages 2217-2229, May.
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