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Jean-Paul CHABARD

IAHR Vice President

Jean-Paul CHABARD

IAHR Vice President

Applications of the Telemac -Mascaret1D/2D/3D Open Source Flow Modelling

System to floods events

IAHR Vice PresidentEDF R&D Project Manager

IAHR Vice PresidentEDF R&D Project Manager

Presentation of the Telemac -Mascaret 1D/2D/3D

Presentation of the Telemac -Mascaret 1D/2D/3D Telemac -Mascaret 1D/2D/3D

Open Source Flow Modelling System

Telemac -Mascaret 1D/2D/3D Open Source Flow Modelling System

� Assumptions

� Flow with one principal direction

� Subcritical or transcritical flow

� Flood plains can be modeled with storage areas : a simple way to model flood plains in some studies

MASCARET Hydraulic modellingMASCARET Hydraulic modelling

� Well adapted for large domain simulation

� Gain on geometric data and on study time

� Singularities simply integrated

� Complementary of 2D and 3D simulations

MAIN

CHANNELFLOOD

PLAIN

STORAGE

AREAS

FLOOD PLAIN FLOOD PLAIN

MASCARET :Functionalities of hydraulic components

MASCARET :Functionalities of hydraulic components

�Three 1D hydraulic components based on the solution of the shallow-water equations

� Unsteady subcritical flow (finites differences –1970)

� Steady transcritical flow

� Transcritical unsteady flow - non hydrostatic waves

(Explicit and implicit finite volumes scheme) (Explicit and implicit finite volumes scheme)

Dry areas - 2D modelling of the junction

� Full network of rivers and channels – storage areas

� Singularities (weir,…)

� Boundary conditions : �Discharge or level imposed – stage-discharge relation –

� Free outflow

� Control of flow changement to domain inflow

� Coupled with transport pollutants –Tracer � Water quality library

Sediment

2 dimensions 3 dimensions

Hydrodynamics

Water quality

TELEMAC-2D TELEMAC-3D

SISYPHE*

Chaining with Delwaq

TELEMAC-3D

SPH (2D or 3D)

SPARTACUS

The TELEMAC hydroinformatic system


Laboratoire National d’Hydraulique et Environnement5

BIEFFinite Elements Library

Fudaa / Rubens / Blue KenueTecplot

Pre- and post-processors

Matisse / Janet

Mesh generators

Groundwater flows

Water quality

waves


ESTEL-2D ESTEL-3D

ARTEMIS

TOMAWAC


* Co-property LNHE-Cetmef

The Telemac system

Main characteristics

• Developed since 1987 at EDF R&D / LNHE

• World distributed (first commercial with 200 licences, now freeware and open source)

• FORTRAN 90, PERL, MPI

• Based on unstructured grids

E

N

S

O


• Based on unstructured grids

• Documentation and validation

Key features• Finite Elements, Implicit schemes

• Parallelism with domain decomposition

• Dry zones

• Non hydrostatic 3D with free surface

Installations all around the world

South-Africa, Germany, Argentina, Belgium, Brazil, Canada, China, South Korea, Croatia, Dubaï, Egypt, Spain, United States, Finland, France, Greece, Holland, India, Iran, Ireland, Italy, Japan, Jordania, Lebanon,

Malaysia, Morocco, Poland, Portugal, Romania, Russia, Serbia, Singapore, Switzerland, Thaïland, Tunisia, Turkey, Vietnam

French consultants

BCEOM, BRL, Canal de Provence, CEA, CETMEF, CNR, CREOCEAN, IX Survey, Météo France, Océanide, Optimer, Port autonome de Nantes, Port autonome de Rouen, Safege, Sétude, SHOM, Sogreah, Veolia


Optimer, Port autonome de Nantes, Port autonome de Rouen, Safege, Sétude, SHOM, Sogreah, Veolia

Universities

UK : Bangor, Birmingham, Bradford, Bristol, Cambridge, Cardiff, East-Anglia, Exeter, Glasgow, Heriot-Watt, Lancaster, Liverpool, London, Loughborough, Manchester, Nottingham, Plymouth, Portsmouth, Reading,

Southampton, St Andrews

Germany : Hannover, Stuttgart, Karlsruhe,… Universities

…

http://www.opentelemac.org

3500 registered users

7500 messages on the forum


108 countries

130 persons in 2011 user club in Paris

20th user club 16-18 October 2013 in Karlsruhe

A consortium to provide manpowerand steer developments

A consortium to provide manpowerand steer developments

� A first circle of industrial, engineering, institutional, academic partners willing to reinforce/enhance the development of the system, and ensuring the industrial quality and validation standards.

� The group decides the integration process and development plan, promotion and assistance, … and engage resources/responsibility for developments, integration of new features, documentation, validation, promotion …). Minimum resources: 2 persons/year

� A steering committee, advised by a scientific committee :

� Decides the technical, strategic and further developments orientations, as well as the valorisation strategy


� Defines the priority in the common developments and way of doing them (internal resources of the members, call to Open source community, ….)

� Checks if the developments fulfil the desired quali ty standards (validation and documentation)

� A specific internet site for the consortium:

� To deliver and download the new reference versions

� To call Opensource community for new developments

� To receive new developments from the community

� To animate the community Forum of users

2D Hydrodynamics

Telemac-2D

• Shallow water equations (Saint-Venant)

• Boussinesq equations

• Meshes of triangles

• Dry zones

• Turbulence models



• Tracers (temperature, pollutants, etc.)

• Weirs

• Culverts

• Sources and sinks

• Open boundary conditions

3D Hydrodynamics

Telemac-3D• Navier-Stokes equations

• Meshes of prisms (superimposed 2D meshes)

• Non hydrostatic 3D with free surface

• Dry zones




• Tracers (temperature, pollutants, sediment)

Some applications to dam break and river flood



modelling


modelling

Main objectives• Conception of dams and river

waterworks• Forecasting for population safety

Dam break and river flood modelling


• Protection of industrial areas• Damage estimation• River basin management• etc.

Flood in river Loire near Dampierre


Real case : The Rhine river

1D- 2D shallow-water coupling1D- 2D shallow-water coupling

Frameworks : Salomé – Coupleur Yacs - Juin 2012

Conférence ICHE – accepted paper « A possible coupling of 1D and 2D models to solve free-surface flow problems » ,

Environmental modelling and software, Malleron N., Zaoui F, NG

Extreme flood in the Rhône valleyExtreme flood in the Rhône valley

�Global model of Rhône valley : domain of 360 km

�Complex hydraulic study with 1D/2D models

�Study of extreme flood for the protection of fluvial nuclear power

2D model

protection of fluvial nuclear power plant

�The Vouglans dam-break (Ain) : dam-break wave simulation study with propagation on 100-year return flood

1D model with storage areas and composed channel

Local 1D model with storage areas

Global 1D model

Vouglans dam

ContextThe Bugey nuclear power plant,located on the Rhône, is protectedagainst severe floods combinedwith a possible failure of theVouglans dam on the Ain river.


Dyke break on river Rhône (study by Compagnie Nationale du Rhône)Dyke break on river Rhône (study by Compagnie Nationale du Rhône)


1D Simulation with Mascaret1D Simulation with Mascaret

� A large number of studies :

� Studies on EDF river dams concerned by safety procedures : 9000 km of French valleys modelled

� International diffusion : Hydro-Québec, SNC-Lavallin

Malpasset dam break


Malpasset dam, 48 million m3, brokeon 2 December 1959, there was433 casualties.

Dam for irrigation, not EDF property

Malpasset dam break Malpasset dam break

Real test for CADAM (Concerted Action on Dam break modelling)

� Fiel data :

� Time propagation :

Shut down of 3transformers

Fielddata(s)

Wave arrival time

(1D)

A (1400) 100 91.4

B (9200) 1240 1221

Wave arrival time

(2D)

110.5

1287

� Physical model : Maximum flooding

0

10

20

30

40

50

60

70

80

90

0 2000 4000 6000 8000 10000 12000

Abscisse (m)

Cot

e (m

)

Field data

V7P0 with head loss

C (10500) 1420 1467 1435

Malpasset dam break


3D simulation with 6 planes on the vertical3D simulation with 6 planes on the vertical

Computer times in Malpasset test-caseComputer times in Malpasset test-case

Telemac-2D Telemac-3D

2 planes on the vertical =

1 layer of elements

Linux

1000 time steps of 4 s eachmesh with 26000 elements


HP Z600

1 proc.

22 s 112 s

Linux

HP Z600

8 proc.

4 s 20 s

(computer time in 1993: 86400 s…)

Ratio Navier-Stokes/Saint-Venant = 5

A dam break application with cars and people(Canadian Hydraulic Center)


Lagrangian Smooth Particle Hydrodynamics

method (SPH) : a promising

Lagrangian Smooth Particle Hydrodynamics

method (SPH) : a promising method (SPH) : a promising tool for dam break and river

flood modelling

method (SPH) : a promising tool for dam break and river

flood modelling

For complex problems out of reach of mesh based CFD• complex free surface flows• multi-phase flows• fluid-structure interactions

Lagrangian Smooth Particle Hydrodynamicsmethod SPH


Aims:• Dimensioning dykes• Designing spillways

3 D model

Schematic dam break


Experiment

2 D model

Smooth Particle Hydrodynamics

First simulation of a real spillway

(Goulours dam)


Costal flood modellingCostal flood modellingCostal flood modellingCostal flood modelling

Storm Xynthia in Charente (France)

26 February-1st March 2010

Tide coefficient 102Wind160 km/h

Storm surge 1,5 m59 casualties

20/09/2008 Laboratoire National d’Hydraulique et Environnement33

Study performed by Artelia

Would be flooding at Saint-Malo

© SOGREAH


topograhy

© SOGREAH

ContextThe city of Saint-Malo is subject tosevere storm surges combined withhigh wind waves, capable of strongovertopping through harbour defences

Would be flooding at Saint-Malo

Finite element mesh(56000 elements)

Laboratoire National d’Hydraulique et Environnement35 © SOGREAH

Conclusion

Serious challenges to face

A diversity of promising methods

Laboratoire National d’Hydraulique et Environnement

36

End of the « 3D is too expensive » anthem

Stop working on simplified equations

The end…


Thank you for your attention