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IMPACT - WP4 Dam-break induced floods and sediment movement Progress report

IMPACT. Investigation of extreme flood Processes and uncertainty. IMPACT - WP4 Dam-break induced floods and sediment movement Progress report. Université catholique de Louvain Yves Zech, Benoit Spinewine and Nicolas le Grelle. Aims and objectives. Improve the prediction

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IMPACT - WP4 Dam-break induced floods and sediment movement Progress report

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  1. IMPACT Investigation of extreme flood Processes and uncertainty IMPACT - WP4Dam-break inducedfloodsand sediment movementProgress report Université catholique de Louvain Yves Zech, Benoit Spinewine and Nicolas le Grelle Dam-break floods and sediment movement

  2. Aims and objectives Improve the prediction of the motion of sediments in association with catastrophic floods Dam-break floods and sediment movement

  3. Issues of IMPACT WP4 research • Extreme flows  intense erosion and solid transport • Intense sediment transport  affects flood-wave prediction • Arrival time • Maximum water level • Morphological changes Dam-break floods and sediment movement

  4. Scope of the research • Near-field • Uniform debris flow • Severe transient debris flow • Far-field • Intense transport • Bank erosion and geomorphic changes Dam-break floods and sediment movement

  5. Near field : problems to be solved • Initiation of movement • Acting forces • Vertical effects • Inertial effects • Sediments bulking • Propagation • Intense scouring • Debris-flow front Dam-break floods and sediment movement

  6. Near-field : programme & schedule • Debris flow : acting forces (UDT) • Dam-break experiments (UCL) • Dam-break numerical modelling (UCL) • Validation of codes (UDT, UCL, Cem) Dam-break floods and sediment movement

  7. Near-field : programme & schedule • Debris flow : acting forces (UDT) • Uniform material • Months 1-18 • Graded material • Months 19-32 Dam-break floods and sediment movement

  8. Near-field : programme & schedule • Dam-break experiments (UCL) • Same bed levels • Months 1-9 • Initial step in bed level • Months 1-9 > 1-23 BM UCL 1 BM UCL 2 Dam-break floods and sediment movement

  9. Near-field : programme & schedule • Dam-break numerical modelling (UCL) • 1D model : months 1-6 • 2D-V model : months 21-32 Dam-break floods and sediment movement

  10. Near-field : programme & schedule • Validation of codes (UDT, UCL, Cem, IST) • 1D dam-break flow in the near field BM UCL 1 BM UCL 2 Dam-break floods and sediment movement

  11. Far field : problems to be solved • Transition from near-field to far-field • Geomorphic changes • Bank erosion and failure • Tractive forces applied • Failure mechanism • Channel widening • Deposition of material • De-bulking • Distribution of sediments • Secondary dams Dam-break floods and sediment movement

  12. Far field : programme & schedule • Laboratory experiments • Dam-break in an initially prismatic valley (UCL) • Large-scale model (Châtelet) • Field experiments : Norwegian dam (SG) • Numerical modelling (UCL) • Validation (UCL, UDT, Cemagref, IST) • Laboratory tests • Field cases Dam-break floods and sediment movement

  13. Far field : programme & schedule • Laboratory experiments • Dam-break in an initially prismatic valley (UCL) • Uniform material • Graded material >probably one test • Months 13-20 BM UCL 4 Dam-break floods and sediment movement

  14. Far field : programme & schedule • Laboratory experiments • Large-scale model (Châtelet) • Months 24-31> 27-31 • Prismatic valley • Same bed level (DB) • (Initial step) (DB) • With embankment (BM Chat) • Enlargement (BM Chat) BM Chat Dam-break floods and sediment movement

  15. Far field : programme & schedule • Field experiments • Norwegian dam (SG) • Geomorphic survey not realised • Months 9-12 : cancelled • Months 19-21: • Downstream survey (DB) Dam-break floods and sediment movement

  16. 50° 85° V bank 37° Far field : programme & schedule • Numerical modelling • Extension of 2D-H model (UCL) • Bank erosion • Months 12-20> 12-31 Dam-break floods and sediment movement

  17. Far field : programme & schedule • Validation (UCL, UDT, Cemagref, IST) • Laboratory tests • Prismatic valley, with embankment • BM UCL 4 : small scale • BM Chat 1 : large scale • Enlargement (BM Chat 2) BM Chat BM UCL 4 Dam-break floods and sediment movement

  18. Far field : programme & schedule • Validation (UCL, UDT, Cemagref, IST) • Field cases : Lake Ha!Ha! • Months 33-35 > 24-34 Brooks and Lawrence 1999 BM Ha!Ha! Dam-break floods and sediment movement

  19. Benchmark summary • Near field • Far field BM UCL 2 BM UCL 1 BM UCL 4 BM Ha!Ha! BM Chat Dam-break floods and sediment movement

  20. IMPACT - WP4Dam-break inducedfloodsand sediment movementProgress report Université catholique de Louvain Yves Zech, Benoit Spinewine and Nicolas le Grelle Dam-break floods and sediment movement

  21. Decisions / questions / discussion • Experiments • Experiments with an initial step • new flume available in June 2003 • completion postponed till September 2003 > November 2003 (1) • Extension to graded material • for the forces acting on sediment • near-field experiments : a few bimodal tests • far-field : probably one test Dam-break floods and sediment movement

  22. Decisions / questions / discussion • Benchmarks • Benchmark BM UCL2 : Dam break experiment with initial step • benchmark available in November 2003 • results December 2003 > March 2004 ? (2) • Benchmark BM UCL3 : 2D-V case • cancelled Dam-break floods and sediment movement

  23. Decisions / questions / discussion • Benchmarks • Benchmark BM UCL4 : Dam-break flow in initially prismatic valley, with uniform (and graded) material • form of the benchmark : 2003 tests • launched in September > November ? (3) • Benchmark BM Chat : Large scale dam-break experiments with uniform material (LRH Châtelet) • form of this benchmark ? (4) Dam-break floods and sediment movement

  24. Decisions / questions / discussion • Benchmarks • Benchmark BM Norway : Norway field test • cancelled ? (5) • Benchmark BM Ha!Ha! : Lake Ha!Ha! dam-break event • feasibility of the schedule • invite a member of the Geological Survey of Canada • discuss format > launched at LLN meeting Dam-break floods and sediment movement

  25. IMPACT - WP4Dam-break inducedfloodsand sediment movementProgress report Université catholique de Louvain Yves Zech, Benoit Spinewine and Nicolas le Grelle Dam-break floods and sediment movement

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