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A multi-technique approach for evaluating sand dynamics in a complex engineered piedmont river system.

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This study introduces a new method to track sand movement in engineered rivers, crucial for managing navigation and flood risks. The findings reveal how sand deposits form and are cleared at river confluences.

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Area of Science:

  • Riverine geomorphology and sediment transport dynamics.

Background:

  • Engineered piedmont rivers present unique challenges for understanding sand transport due to modified bedload dynamics and residual sand on gravel substrates.
  • Limited research exists on sand dynamics in these altered river systems, necessitating innovative methodological protocols.

Purpose of the Study:

  • To propose and apply a multi-technique approach for studying sand dynamics in engineered piedmont rivers.
  • To gain insights into sand fluxes at the complex Isère-Rhône confluence, addressing a lack of available sediment flux data.

Main Methods:

  • Utilized a combination of bathymetry and turbidity measurements.
  • Employed numerical modeling, including sediment rating curves and 2D simulations.
  • Conducted sediment budgeting for cross-validation of results.

Main Results:

  • Identified that sediment transport capacity was met during a 2015 flushing event, with negligible sand supply when dam gates were closed.
  • Observed that suspended sand loads predominated downstream of the final dam but settled rapidly at the confluence.
  • Determined that sand deposits were cleared by subsequent minor floods.

Conclusions:

  • The developed multi-technique methodology provides valuable insights into sand dynamics in engineered river systems.
  • The findings are transferable to other river sites facing similar issues with sand transport and deposition.
  • Effective management of sand fluxes is critical for navigation and flood control at river confluences.