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

Mo-i-Rana - September 2002

Dam-break floods and sediment movement

IMPACT - WP4IMPACT - WP4

Dam-break inducedDam-break induced floodsfloodsand sediment movementand sediment movement

Progress report

Université catholique de Louvain

Yves Zech, Benoit Spinewine and Sandra Soares Frazão

Aims and objectivesAims and objectives

Improve the prediction

of the motion of sediments

in association with catastrophic floods

MotivationMotivation

• Dike breaching

BitterfeldRiver ElbeGermanyAugust 2002

• Dike-breaching wave

GlashütteMüglitzGermanyAugust 2002

• Debris flow

WeisensteinRiver ElbeGermanyAugust 2002

Issues of IMPACT WP4 researchIssues 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

Scope of the researchScope of the research

• Near-field – Uniform debris flow– Severe transient debris flow

• Far-field – Intense transport– Bank erosion and geomorphic changes

Near field : problems to be solvedNear field : problems to be solved

• Initiation of movement– Acting forces– Vertical effects– Inertial effects– Sediments bulking

• Propagation– Intense scouring– Debris-flow front

Debris flow : research programmeDebris flow : research programme

• Experiments : acting forces (UDT)– Uniform material

• Months 1-18

– Graded material• Months 18-32

BM UDT ?

Debris flow : research reportDebris flow : research report

• Uniform material experiments– Tilting flume (L = 6 m, S0 = 0° to 23°)

– Uniform cylindrical PVC particles• Equivalent spherical D = 3.5 mm• Density = 1540 kg/m³

• Mature debris flow: collisional + frictional

• Rigid-bed debris flowcollisional

• Mature debris flow

• Mathematical description (collisional)– Normal stress local equilibrium

• Submerged weight overlying grains• Inter-granular collisional contacts

(pressure related to granular temperature)

– Tangential stress local equilibrium• Relation between external

and internal tangentialstress

• Effect of added mass

• Rigid bed debris flow– Concentration

– Velocity profile

0.000 0.100 0.200 0.300 0.400 0.500 0.600 0.700 0.800

c-theoreticalprofile

c-exsperimentalprofile

0.000 0.500 1.000 1.500 2.000

u [m /s]

u-theoreticalprofile

u-exsperimentalprofile

Near-field dam break : programmeNear-field dam break : programme

• Experiments: uniform material (UCL)– Same bed levels

• Months 1-9

– Initial step in bed levels• Months 1-9

BM UCL 2

BM UCL 1

Near-field dam break : research reportNear-field dam break : research report

• Experiments: uniform material (UCL)– Same bed levels

Near-field dam break : programmeNear-field dam break : programme

• Mathematical modelling (UCL)– 1D model: months 1-6

– 2D-V model: months 21-32BM UCL 3

• Mathematical modelling (UCL)– 1D model:

• Velocity distribution• (Concentration distribution)

Near-field dam break : research reportNear-field dam break : research report

pure water

mixture

Near-field : research programmeNear-field : research programme

• Validation of codes (UDT, UCL, Cem)– Uniform debris flow (to be clarified)

• Months 11-12

BM UDT ?

Near-field : research programmeNear-field : research programme

• Validation of codes (UDT, UCL, Cem)– 1D dam-break flow in the near field

• Months 11-12

– 2D-V dam-break flow• Months 34-35

BM UCL 2BM UCL 1

BM UCL 3

Far field : problems to be solvedFar 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• Formation of secondary dams

Far field : research programmeFar field : research programme

• Laboratory experiments– Dam-break in an initially prismatic valley

(UCL)• Uniform material• Graded material

• Months 13-20

BM UCL 4

• Laboratory experiments– Large-scale model (Châtelet)

• Prismatic valley• Enlargement

• Months 24-31

BM Chat

• Field experiments– Norwegian dam (SG)

• Geomorphic survey (to be checked)

• Months 9-12 and 19-21

BM Norway

• Numerical modelling– Extension of 2D-H model (UCL)

• Bank erosion

• Months 12-20 50°

• Validation (UCL, UDT, Cemagref, IST)– Laboratory tests

• Prismatic valley (UCL)• Enlargement (Châtelet)

BM UCL 4 BM Chat

• Validation (UCL, UDT, Cemagref, IST)– Field tests

• WP2 Norwegian dam ?• Lake Ha!Ha!

• Months 33-35

BM Ha!Ha!

BM Norway

Brooks and Lawrence1999

Benchmark summaryBenchmark summary

• Near field

• Far field

BM Ha!Ha!

BM Norway

BM UCL 4

BM Chat

BM UCL 3BM UCL 2BM UCL 1

BM UDT ?

IMPACT - WP4IMPACT - WP4

Dam-break inducedDam-break induced floodsfloodsand sediment movementand sediment movement

Progress report

Université catholique de Louvain

Yves Zech, Benoit Spinewine and Sandra Soares Frazão

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

Documents

WP4: African Emissions

Effects of Catastrophic Floods and Debris Flows on the ... · Denlinger, R.P., 2012, Effects of catastrophic floods and debris flows on the sediment retention structure, North Fork

PRAXIS WP4 - Branding

Wallingford - May 2002 Dam-break floods and sediemnt movement 1 IMPACT - WP4 Dam-break induced floods and sediment movement IMPACT - WP4 Dam-break induced

Mississippi River System Carries sediment to sea and deposits in Birdfoot delta lobe in Gulf of Mexico Regional Floods Figure 14.21

SPATIAL VARIATIONS OF SUSPENDED SEDIMENT GRAIN … · spatial variations of suspended sediment grain size in small mountain catchment during summer floods ... the beskid mountains

Goldenbeld escape wp4

Sediment transport rates of major floods in glacial and ... · Sediment transport rates of major floods in glacial ... measurement, Fig 2. There thus ... there was severe erosion

WP4 - Monitoring

Frank Zimmermann for the WP4 coordinators EuCARD – WP4 ... · Frank Zimmermann. for the WP4 coordinators. EuCARD – WP4 Meeting, RAL, 13 April ‘10

WP4 Activities

WP4 - arpa.vda.it

WP4 SURVEY RESULTS

Calice WP4

IMPACT - WP4 Dam-break induced floods and sediment movement

SIMPLE guidelines, WP4

Marta Martínez WP4

WP4 main objectives

Disaster Summary Sheet FLOODS - ACAPS · DSS - Floods Page 2 of 23 Flood-related debris such as sediment, silt, and organic material will affect drainage channels, public roads, public

Minutes of the WP4 Fall Meeting held in Stockholm Sept.07-2011€¦ · Presentation of the EFC WP4 4 3.2. EFC WP4 Members 4 3.3. EFC WP4 Awards 4 4. EFC WP4 publications 5 5. EFC