Louvain-la-Neuve - Nov 2003 Dam-break floods and sediment movement 1 IMPACT - WP4 Dam-break induced floods and sediment movement IMPACT - WP4 Dam-break induced floods and sediment movement Progress report Université catholique de Louvain Yves Zech, Benoit Spinewine and Nicolas le Grelle IMPACT Investigation of extreme flood Processes and uncertainty

Louvain-la-Neuve - Nov 2003 Dam-break floods and sediment movement 2 Aims and objectives Improve the prediction of the motion of sediments in association with catastrophic floods

Louvain-la-Neuve - Nov 2003 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

Louvain-la-Neuve - Nov 2003 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

Louvain-la-Neuve - Nov 2003 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

Louvain-la-Neuve - Nov 2003 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)

Louvain-la-Neuve - Nov 2003 Dam-break floods and sediment movement 7 Debris flow : acting forces (UDT) –Uniform material Months 1-18 –Graded material Months Near-field : programme & schedule

Louvain-la-Neuve - Nov 2003 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

Louvain-la-Neuve - Nov 2003 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

Louvain-la-Neuve - Nov 2003 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

Louvain-la-Neuve - Nov 2003 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

Louvain-la-Neuve - Nov 2003 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

Louvain-la-Neuve - Nov 2003 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 BM UCL 4

Louvain-la-Neuve - Nov 2003 Dam-break floods and sediment movement 14 Far field : programme & schedule Laboratory experiments –Large-scale model (Châtelet) Months > Prismatic valley –Same bed level (DB) –(Initial step) (DB) –With embankment (BM Chat) Enlargement (BM Chat) BM Chat

Louvain-la-Neuve - Nov 2003 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)

Louvain-la-Neuve - Nov 2003 Dam-break floods and sediment movement 16 Far field : programme & schedule Numerical modelling –Extension of 2D-H model (UCL) Bank erosion Months > ° 37° 85° V bank

Louvain-la-Neuve - Nov 2003 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

Louvain-la-Neuve - Nov 2003 Dam-break floods and sediment movement 18 Far field : programme & schedule Validation (UCL, UDT, Cemagref, IST) –Field cases : Lake Ha!Ha! Months > BM Ha!Ha! Brooks and Lawrence 1999

Louvain-la-Neuve - Nov 2003 Dam-break floods and sediment movement 19 Benchmark summary Near field Far field BM UCL 1 BM UCL 2 BM UCL 4 BM Ha!Ha! BM Chat

Louvain-la-Neuve - Nov 2003 Dam-break floods and sediment movement 20 IMPACT - WP4 Dam-break induced floods and sediment movement IMPACT - WP4 Dam-break induced floods and sediment movement Progress report Université catholique de Louvain Yves Zech, Benoit Spinewine and Nicolas le Grelle

Louvain-la-Neuve - Nov 2003 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

Louvain-la-Neuve - Nov 2003 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

Louvain-la-Neuve - Nov 2003 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)

Louvain-la-Neuve - Nov 2003 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

Louvain-la-Neuve - Nov 2003 Dam-break floods and sediment movement 25 IMPACT - WP4 Dam-break induced floods and sediment movement IMPACT - WP4 Dam-break induced floods and sediment movement Progress report Université catholique de Louvain Yves Zech, Benoit Spinewine and Nicolas le Grelle