Impact wp4 sediment movement work overview
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IMPACT - WP4 Sediment movement Work overview. Université catholique de Louvain Nicolas le Grelle, Benoit Spinewine and Yves Zech. Scope of the research. Near-field Severe transient debris flow Far-field Bank erosion and geomorphic changes. Near field : problems to be solved. Propagation

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Impact wp4 sediment movement work overview

IMPACT - WP4Sediment movementWork overview

Université catholique de Louvain

Nicolas le Grelle, Benoit Spinewine and Yves Zech

Sediment movement - UCL


Scope of the research

Scope of the research

  • Near-field

    • Severe transient debris flow

  • Far-field

    • Bank erosion and geomorphic changes

Sediment movement - UCL


Near field problems to be solved

Near field : problems to be solved

Propagation

  • Intense scouring

  • Debris-flow front

Sediment movement - UCL


Dam break near field

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


Dam break near field1

Dam-break near field

  • Construction of a new flume

    • Downwards moving gate

    • Various bed levels

    • Possibility of enlargement

Sediment movement - UCL


Dam break near field2

Dam-break near field

Sediment movement - UCL


Impact wp4 sediment movement work overview

z

pure water

mixture

u

Dam-break near field

  • Mathematical modelling

    • 1D model :

      • Velocity distribution

      • Concentration distribution

Sediment movement - UCL


Impact wp4 sediment movement work overview

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


Far field problems to be solved

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


Far field programme

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


Far field programme1

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


Dam break far field

Dam-break far-field

  • Laboratory experiment

    • Dam-break in an initially prismatic valley

Sediment movement - UCL


Dam break far field1

Dam-break far-field

  • Laboratory experiment

    • Dam-break in an initially prismatic valley

Sediment movement - UCL


Dam break far field2

1

3

2

Dam-break far-field

Dam-break in

an initially

prismatic valley

Sediment movement - UCL


Dam break far field3

Dam-break far-field

  • Dam-break in an initially prismatic valley

    • Images treatment

Sediment movement - UCL


Dam break far field4

Dam-break far-field

  • Dam-break in an initially prismatic valley

    • Reproducibility

t = 1 s

Sediment movement - UCL


Dam break far field5

Dam-break far-field

  • Dam-break in an initially prismatic valley

    • Reproducibility

t = 5 s

Sediment movement - UCL


Dam break far field6

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


Far field programme2

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


Dam break far field7

Dam-break far-field

  • Large scale model

    at LRH-Châtelet

Sediment movement - UCL


Dam break far field8

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


Dam break far field9

h0

h s

Gate

1 m

Dam-break far-field

  • Large scale model : Test 1 - Calibration

Sediment movement - UCL


Dam break far field10

h0

hs

Dam-break far-field

  • Large scale model : Test 2 - Benchmark

Sediment movement - UCL


Dam break far field11

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


Far field programme3

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


Impact wp4 sediment movement work overview

Sediment movement - UCL


Dam break far field12

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


Dam break far field13

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


Dam break far field14

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


Far field programme4

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


Comparison

Comparison

  • 1D Numerical modelling

Sediment movement - UCL


Comparison1

Comparison

  • 1D Numerical modelling

Sediment movement - UCL


Comparison2

Comparison

  • 1D Numerical modelling

Sediment movement - UCL


Comparison3

Comparison

  • 1D Numerical modelling

Sediment movement - UCL


Comparison4

Comparison

  • 1D Numerical modelling

Sediment movement - UCL


Comparison5

Comparison

  • 1D Numerical modelling

Sediment movement - UCL


Comparison6

Comparison

  • 1D Numerical modelling

Sediment movement - UCL


Comparison7

Comparison

  • 1D Numerical modelling

Sediment movement - UCL


Comparison8

Comparison

  • 1D Numerical modelling

Sediment movement - UCL


Comparison9

Comparison

  • 1D Numerical modelling

Sediment movement - UCL


Comparison10

Comparison

  • 1D Numerical modelling

Sediment movement - UCL


Far field programme5

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


Dam break far field15

Dam-break far field

  • Field test : Lake Ha!Ha!

Brooks & Lawrence, 1999

Sediment movement - UCL


Impact wp4 sediment movement work overview1

IMPACT - WP4Sediment movementWork overview

Université catholique de Louvain

Nicolas le Grelle, Benoit Spinewine and Yves Zech

Sediment movement - UCL


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