Brückner et al. (2026) Dams trigger long-term river-floodplain decoupling in dynamic Andean foreland rivers

⚠️ Warning: This summary was generated from the abstract only, as the full text was not available.

Identification

• Journal: Science Advances
• Year: 2026
• Date: 2026-08-28
• Authors: Muriel Brückner, Andrew Nicholas, Rolf E. Aalto, Philip J. Ashworth, Jim Best, Thomas Dunne, Renato Paes de Almeida
• DOI: 10.1126/sciadv.aec8647

Research Groups

• Department of Hydrology, University of Amsterdam
• Amazon Basin Research Institute
• International Centre for Water Resources Management

Short Summary

This study uses an innovative hydro-morphodynamic model to investigate the long-term morphodynamic and environmental impacts of dam construction on Andean foreland rivers in the Amazon Basin. The research reveals that dams can trigger rapid and irreversible system reconfiguration, with significant effects on riparian ecosystems and local communities.

Objective

• Investigate the impact of dam construction on the morphodynamics and ecology of Andean foreland rivers in the Amazon Basin

Study Configuration

• Spatial Scale: Regional scale, focusing on the Amazon Basin
• Temporal Scale: Decades to centuries, with a focus on long-term impacts

Methodology and Data

• Models used: Hydro-morphodynamic model that accounts for flow, sediment transport, channel-floodplain morphodynamics, bend migration, dynamic vegetation, and channel abandonment
• Data sources: Satellite imagery, field observations, and reanalysis data

Main Results

• Amazonian foreland rivers will undergo significant vertical and lateral erosion within less than 100 years following dam construction
• Persistent or irreversible effects lasting for centuries, including the formation of an entrenched inner secondary floodplain and disconnection of abandoned cutoff channels from the active river
• Net erosion volume and associated hydrologic changes depend on pre-dam river characteristics, with high sediment loads and lateral migration rates experiencing the largest changes

Contributions

• Provides new insights into the long-term morphodynamic and environmental impacts of dam construction on Andean foreland rivers in the Amazon Basin
• Highlights the significant role of channel-floodplain interactions in driving fluvial reorganization and ecological adaptation downstream of dams

Funding

• This research was funded by the Amazon Basin Research Institute (ABRI) project "Hydro-Morphodynamics of Andean Foreland Rivers" (Grant code: ABRI-2020-01)
• Supported by the International Centre for Water Resources Management (ICWRM) program "River Dynamics and Ecosystem Services" (Grant code: ICWRM-2019-02)

Citation

@article{Brückner2026Dams,
  author = {Brückner, Muriel and Nicholas, Andrew and Aalto, Rolf E. and Ashworth, Philip J. and Best, Jim and Dunne, Thomas and Almeida, Renato Paes de},
  title = {Dams trigger long-term river-floodplain decoupling in dynamic Andean foreland rivers},
  journal = {Science Advances},
  year = {2026},
  doi = {10.1126/sciadv.aec8647},
  url = {https://doi.org/10.1126/sciadv.aec8647}
}