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Overview of Sediment Movement Research at Université Catholique de Louvain (UCL)

This overview presents the research scope on sediment movement at UCL, focusing on both near-field and far-field studies related to dam-break scenarios. Key areas include studying severe transient debris flows, bank erosion, and geomorphic changes. The research involves laboratory experiments, mathematical modeling, and validation of numerical codes. Techniques evaluated encompass 1D numerical modeling, large-scale modeling in initially prismatic valleys, and sediment behavior under varying conditions. The findings aim to enhance understanding of sediment dynamics and their impact on landscapes.

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Overview of Sediment Movement Research at Université Catholique de Louvain (UCL)

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  1. IMPACT - WP4Sediment movementWork overview Université catholique de Louvain Nicolas le Grelle, Benoit Spinewine and Yves Zech Sediment movement - UCL

  2. Scope of the research • Near-field • Severe transient debris flow • Far-field • Bank erosion and geomorphic changes Sediment movement - UCL

  3. Near field : problems to be solved Propagation • Intense scouring • Debris-flow front Sediment movement - UCL

  4. Dam-break near field • Experiments : uniform material (UCL) • Rising gate • Same bed levels • Sediments swept along the rising gate • Limited water depth Sediment movement - UCL

  5. Dam-break near field • Construction of a new flume • Downwards moving gate • Various bed levels • Possibility of enlargement Sediment movement - UCL

  6. Dam-break near field Sediment movement - UCL

  7. z pure water mixture u Dam-break near field • Mathematical modelling • 1D model : • Velocity distribution • Concentration distribution Sediment movement - UCL

  8. Dam-break near field • Validation of codes • Benchmark BM UCL 1 :1D dam-break flow in the near field h00.10 m hs L = 0.10 m Sediment movement - UCL

  9. Far field : problems to be solved • Geomorphic changes • Bank erosion and failure • Tractive forces applied • Failure mechanism • Channel widening Brooks & Lawrence, 1999 Sediment movement - UCL

  10. Far field : programme • Laboratory experiments • Dam-break in an initially prismatic valley • Large-scale model (Châtelet) • Numerical modelling • Validation (UCL, UDT, Cemagref, IST) • Laboratory tests • Field cases Sediment movement - UCL

  11. Far field : programme • Laboratory experiments • Dam-break in an initially prismatic valley • Large-scale model (Châtelet) • Numerical modelling • Validation (UCL, UDT, Cemagref, IST) • Laboratory tests • Field cases Sediment movement - UCL

  12. Dam-break far-field • Laboratory experiment • Dam-break in an initially prismatic valley Sediment movement - UCL

  13. Dam-break far-field • Laboratory experiment • Dam-break in an initially prismatic valley Sediment movement - UCL

  14. 1 3 2 Dam-break far-field Dam-break in an initially prismatic valley Sediment movement - UCL

  15. Dam-break far-field • Dam-break in an initially prismatic valley • Images treatment Sediment movement - UCL

  16. Dam-break far-field • Dam-break in an initially prismatic valley • Reproducibility t = 1 s Sediment movement - UCL

  17. Dam-break far-field • Dam-break in an initially prismatic valley • Reproducibility t = 5 s Sediment movement - UCL

  18. 57 cm 16 cm 50° 8 cm 30 cm Upstream Downstream Dam-break far-field • Dam-break in an initially prismatic valley • Initial conditions (benchmark) Sediment movement - UCL

  19. Far field : programme • Laboratory experiments • Dam-break in an initially prismatic valley • Large-scale model (Châtelet) • Numerical modelling • Validation (UCL, UDT, Cemagref, IST) • Laboratory tests • Field cases Sediment movement - UCL

  20. Dam-break far-field • Large scale model at LRH-Châtelet Sediment movement - UCL

  21. 3,90 m 1,535 m Dam-break far-field • Large scale model at LRH-Châtelet Weight = 190 kg Jack = 2400 N Opening time = 1 sec Sediment movement - UCL

  22. h0 h s Gate 1 m Dam-break far-field • Large scale model : Test 1 - Calibration Sediment movement - UCL

  23. h0 hs Dam-break far-field • Large scale model : Test 2 - Benchmark Sediment movement - UCL

  24. 1 m 3 m Section AA Section BB h0 hs AA BB Dam-break far-field • Large scale model : Test 3 - Benchmark Sediment movement - UCL

  25. Far field : programme • Laboratory experiments • Dam-break in an initially prismatic valley • Large-scale model (Châtelet) • Numerical modelling • Validation (UCL, UDT, Cemagref, IST) • Laboratory tests • Field cases Sediment movement - UCL

  26. Sediment movement - UCL

  27. Dam-break far field • Sand behaviour for small-scale laboratory exp. • Humid sand • Residual water • Apparent cohesion • Disappears when underwater • « Rotating tank » experiments • Different angles of repose • Emerged • Submerged Sediment movement - UCL

  28. Dam-break far field • Modelling of bank failures • Simple model accounting for discrete mass failure events • Distinct angles of repose for submerged and emerged banks • Failure triggered whenever and wherever critical angles exceeded • To be extended to 2D by invoking conic failure surfaces Sediment movement - UCL

  29. Dam-break far field • 1D Numerical modelling • Hydrodynamic: finite volume, Roe • Sediment transport: non-equilibrium, bed and submerged banks • Bank failure • Two angles of failure (emerged & submerged) • Two angles of repose (emerged & submerged) Sediment movement - UCL

  30. Far field : programme • Laboratory experiments • Dam-break in an initially prismatic valley • Large-scale model (Châtelet) • Numerical modelling • Validation (UCL, UDT, Cemagref, IST) • Laboratory tests • Field cases Sediment movement - UCL

  31. Comparison • 1D Numerical modelling Sediment movement - UCL

  32. Comparison • 1D Numerical modelling Sediment movement - UCL

  33. Comparison • 1D Numerical modelling Sediment movement - UCL

  34. Comparison • 1D Numerical modelling Sediment movement - UCL

  35. Comparison • 1D Numerical modelling Sediment movement - UCL

  36. Comparison • 1D Numerical modelling Sediment movement - UCL

  37. Comparison • 1D Numerical modelling Sediment movement - UCL

  38. Comparison • 1D Numerical modelling Sediment movement - UCL

  39. Comparison • 1D Numerical modelling Sediment movement - UCL

  40. Comparison • 1D Numerical modelling Sediment movement - UCL

  41. Comparison • 1D Numerical modelling Sediment movement - UCL

  42. Far field : programme • Laboratory experiments • Dam-break in an initially prismatic valley • Large-scale model (Châtelet) • Numerical modelling • Validation (UCL, UDT, Cemagref, IST) • Laboratory tests • Field cases Sediment movement - UCL

  43. Dam-break far field • Field test : Lake Ha!Ha! Brooks & Lawrence, 1999 Sediment movement - UCL

  44. IMPACT - WP4Sediment movementWork overview Université catholique de Louvain Nicolas le Grelle, Benoit Spinewine and Yves Zech Sediment movement - UCL

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