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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

slide7

z

pure water

mixture

u

Dam-break near field

  • Mathematical modelling
    • 1D model :
      • Velocity distribution
      • Concentration distribution

Sediment movement - UCL

slide8

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

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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