UCL-November 03Sediment movement - UCL1 IMPACT - WP4 Sediment movement Work overview Université catholique de Louvain Nicolas le Grelle, Benoit Spinewine.

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Presentation transcript:

UCL-November 03Sediment movement - UCL1 IMPACT - WP4 Sediment movement Work overview Université catholique de Louvain Nicolas le Grelle, Benoit Spinewine and Yves Zech

UCL-November 03Sediment movement - UCL2 Scope of the research Near-field –Severe transient debris flow Far-field –Bank erosion and geomorphic changes

UCL-November 03Sediment movement - UCL3 Near field : problems to be solved Propagation –Intense scouring –Debris-flow front

UCL-November 03Sediment movement - UCL4 Dam-break near field Experiments : uniform material (UCL) –Rising gate –Same bed levels –Sediments swept along the rising gate –Limited water depth

UCL-November 03Sediment movement - UCL5 Dam-break near field Construction of a new flume –Downwards moving gate –Various bed levels –Possibility of enlargement

UCL-November 03Sediment movement - UCL6 Dam-break near field

UCL-November 03Sediment movement - UCL7 Mathematical modelling –1D model : Velocity distribution Concentration distribution Dam-break near field pure water mixture u z

UCL-November 03Sediment movement - UCL8 Dam-break near field Validation of codes –Benchmark BM UCL 1 : 1D dam-break flow in the near field L = 0.10 m h m hshs

UCL-November 03Sediment movement - UCL9 Far field : problems to be solved Geomorphic changes –Bank erosion and failure Tractive forces applied Failure mechanism –Channel widening Brooks & Lawrence, 1999

UCL-November 03Sediment movement - UCL10 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

UCL-November 03Sediment movement - UCL11 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

UCL-November 03Sediment movement - UCL12 Dam-break far-field Laboratory experiment –Dam-break in an initially prismatic valley

UCL-November 03Sediment movement - UCL13 Dam-break far-field Laboratory experiment –Dam-break in an initially prismatic valley

UCL-November 03Sediment movement - UCL14 Dam-break far-field Dam-break in an initially prismatic valley 1 2 3

UCL-November 03Sediment movement - UCL15 Dam-break far-field Dam-break in an initially prismatic valley –Images treatment

UCL-November 03Sediment movement - UCL16 Dam-break far-field Dam-break in an initially prismatic valley –Reproducibility t = 1 s

UCL-November 03Sediment movement - UCL17 Dam-break far-field Dam-break in an initially prismatic valley –Reproducibility t = 5 s

UCL-November 03Sediment movement - UCL18 Dam-break far-field Dam-break in an initially prismatic valley –Initial conditions (benchmark) Upstream Downstream 50° 8 cm 16 cm 30 cm 57 cm

UCL-November 03Sediment movement - UCL19 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

UCL-November 03Sediment movement - UCL20 Dam-break far-field Large scale model at LRH-Châtelet

UCL-November 03Sediment movement - UCL21 Dam-break far-field Large scale model at LRH-Châtelet 3,90 m 1,535 m Weight = 190 kg Jack = 2400 N Opening time = 1 sec

UCL-November 03Sediment movement - UCL22 Dam-break far-field Large scale model : Test 1 - Calibration h s h0h0 Gate 1 m

UCL-November 03Sediment movement - UCL23 Dam-break far-field Large scale model : Test 2 - Benchmark h0h0 hshs

UCL-November 03Sediment movement - UCL24 Dam-break far-field Large scale model : Test 3 - Benchmark Section BBSection AA AA BB h0h0 hshs 1 m3 m

UCL-November 03Sediment movement - UCL25 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

UCL-November 03Sediment movement - UCL26

UCL-November 03Sediment movement - UCL27 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

UCL-November 03Sediment movement - UCL28 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

UCL-November 03Sediment movement - UCL29 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)

UCL-November 03Sediment movement - UCL30 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

UCL-November 03Sediment movement - UCL31 Comparison 1D Numerical modelling

UCL-November 03Sediment movement - UCL32 Comparison 1D Numerical modelling

UCL-November 03Sediment movement - UCL33 Comparison 1D Numerical modelling

UCL-November 03Sediment movement - UCL34 Comparison 1D Numerical modelling

UCL-November 03Sediment movement - UCL35 Comparison 1D Numerical modelling

UCL-November 03Sediment movement - UCL36 Comparison 1D Numerical modelling

UCL-November 03Sediment movement - UCL37 Comparison 1D Numerical modelling

UCL-November 03Sediment movement - UCL38 Comparison 1D Numerical modelling

UCL-November 03Sediment movement - UCL39 Comparison 1D Numerical modelling

UCL-November 03Sediment movement - UCL40 Comparison 1D Numerical modelling

UCL-November 03Sediment movement - UCL41 Comparison 1D Numerical modelling

UCL-November 03Sediment movement - UCL42 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

UCL-November 03Sediment movement - UCL43 Dam-break far field Field test : Lake Ha!Ha! Brooks & Lawrence, 1999

UCL-November 03Sediment movement - UCL44 IMPACT - WP4 Sediment movement Work overview Université catholique de Louvain Nicolas le Grelle, Benoit Spinewine and Yves Zech