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Effects of Restoration and Conservation of Riparian Vegetation on Sediment Retention in the Catchment Area of Corumbá IV Hydroelectric Power Plant, Brazil

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  • Natália Pezzi Fachinelli

    (Energy Planning Program PPE/COPPE, Federal University of Rio de Janeiro, Rio de Janeiro 21941-914, Brazil)

  • Amaro Olímpio Pereira

    (Energy Planning Program PPE/COPPE, Federal University of Rio de Janeiro, Rio de Janeiro 21941-914, Brazil)

Abstract

Vegetation cover and land use are important factors related to the capacity of ecosystems to provide soil loss regulation and sediment retention services, which are highly relevant for sediment management in watersheds draining into reservoirs with multiple water uses. One way to ensure the protection and recovery of vegetation by landowners in Brazil is the implementation of the federal Native Vegetation Protection Law (NVPL), which designates environmentally sensitive areas as Areas of Permanent Preservation (APPs), aiming to conserve water resources and prevent soil erosion. The benefits of riparian vegetation in the catchment of Corumbá IV Hydroelectric Power Plant (HPP), located in the Brazilian Cerrado, were analyzed considering landscape reconfigurations from a baseline condition (year 2011) in order to account for the recovery of riparian vegetation by the agricultural sector, as foreseen in the NVPL. The Sediment Delivery Ratio (SDR) model from the InVEST (Integrated Valuation of Environmental Services and Tradeoffs) package was used to map and quantify variations in sediment export and sediment retention throughout the catchment. The reduction in annual sediment export in the drainage basin of the Corumbá IV reservoir reached −27% in the scenario where the total deficit of riparian APPs occupied by pasture or agriculture in the baseline map (41.000 ha) are recovered. While 14% of riparian APP are occupied by crops versus 86% occupied by pasture in the drainage basin of the Corumbá IV HPP, the recovery of riparian zones occupied by agricultural activities resulted in the greatest benefits in sediment retention for the reservoir. The methodology employed in this study can support the prioritization of sectoral efforts for the restoration and conservation of native vegetation, considering the highest returns in benefits perceived by water users affected by sediment input in reservoirs. The study’s results reinforce the importance of conserving vegetation in riparian areas and their surroundings for sediment retention, highlighting the role of these areas as assets in providing water-related ecosystem services. For future developments, it is suggested to assess the interconnections among the energy, water, and food sectors to better understand the barriers and challenges to the maintenance and improvement of water-related ecosystem services in the catchment area of Corumbá IV HPP.

Suggested Citation

  • Natália Pezzi Fachinelli & Amaro Olímpio Pereira, 2023. "Effects of Restoration and Conservation of Riparian Vegetation on Sediment Retention in the Catchment Area of Corumbá IV Hydroelectric Power Plant, Brazil," World, MDPI, vol. 4(4), pages 1-16, September.
    • Handle: RePEc:gam:jworld:v:4:y:2023:i:4:p:40-652:d:1247769
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    References listed on IDEAS

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    1. Guidotti, Vinicius & Ferraz, Silvio Frosini de Barros & Pinto, Luis Fernando Guedes & Sparovek, Gerd & Taniwaki, Ricardo H. & Garcia, Lara Gabrielle & Brancalion, Pedro H.S., 2020. "Changes in Brazil’s Forest Code can erode the potential of riparian buffers to supply watershed services," Land Use Policy, Elsevier, vol. 94(C).
    2. Vogl, Adrian L. & Dennedy-Frank, P. James & Wolny, Stacie & Johnson, Justin A. & Hamel, Perrine & Narain, Urvashi & Vaidya, Anil, 2016. "Managing forest ecosystem services for hydropower production," Environmental Science & Policy, Elsevier, vol. 61(C), pages 221-229.
    3. Grizzetti, B. & Lanzanova, D. & Liquete, C. & Reynaud, A. & Cardoso, A.C., 2016. "Assessing water ecosystem services for water resource management," Environmental Science & Policy, Elsevier, vol. 61(C), pages 194-203.
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