ÉC OLE POLY TEC H NIQU EFÉDÉRALE D E LAUSAN NE

Laboratoire de constructions hydrauliques

Missions

Maintain a permanentsynergy between

teaching, researchand services

Laboratoryof

Hydraulic Constructions(LCH)

Director :Prof. Dr. Anton Schleiss

ÉC OLE POLY TEC H NIQU EFÉDÉRALE D E LAUSAN NE

Laboratoire de constructions hydrauliques

Field of activitiesHydraulic engineering of

infrastructures and systems

water supply systems in rural and urban areaswater resources management in catchment areashydropower schemes and damssafety of hydraulic structures in view of extreme floods and their modellingriver training works, flood protection and revitalisation measuressafety and optimisation of complex hydraulic schemescoastal and harbour engineering in lakesprotection measures against oil spills

ÉC OLE POLY TEC H NIQU EFÉDÉRALE D E LAUSAN NE

Laboratoire de constructions hydrauliques

General line of researchResearch concentrates on the interactions of hydraulic structures and schemes with their environment, in particular with water air and underground. It focusses essentially on topics corresponding to present and future concerns of large infrastructures projects.Research is carried out by using hybrid modelling that is a combination of physical and numercial simulations.

Reservoir sedimentationdue to turbidity currents

High velocity flow overmacro-roughness

Scouring in river bends Rock scour due to highvelocity jet impact

ÉC OLE POLY TEC H NIQU EFÉDÉRALE D E LAUSAN NE

Laboratoire de constructions hydrauliques

Energy dissipation and hydrodynamic forces of aerated flow overmacro-roughness linings for overtopped embankment damsGoal: dissipate as much as possible of the flow energydissipate as much as possible of the flow energy with optimalmacromacro--roughnessroughness liningsSystems tested in laboratory (30°-18° inclined flume)and by numerical-modeling:

Dissipating sources :

Effects of macro-roughness:Diminution of the cavitation risksIncrease of the flow resistanceCreation of an additional drag force⇒⇒ Increase of energy dissipation Increase of energy dissipation

by 40% to 60%by 40% to 60% compared to smooth slopes

Vortices

Transverse jets

Separation zones

ÉC OLE POLY TEC H NIQU EFÉDÉRALE D E LAUSAN NE

Laboratoire de constructions hydrauliques

Scouring by jet impact on rocky riverbeds downstream of dams and dynamic flow pressures

reality laboratory

Physical processof scouring

Scour hole evolution

Prevent dangerous erosion of dam foundation and valley side-slopes

Fondamental research installation to analyse:

Turbulent flow in the pool

Dynamic pressure at rock-water interface and propagation inside rock fissures

Amplifying / damping effect of air

Katse Dam, Lesotho

ÉC OLE POLY TEC H NIQU EFÉDÉRALE D E LAUSAN NE

Laboratoire de constructions hydrauliques

ErosionDeposits

Zeit

ZuflussFeststoffkonzentration

Boundary conditions

Bottom interactionMaps of erosion and deposits

- Inflow- Sediment concentration

Time

Research of technical measures by the helpof physical and numerical modeling

Density currents are the main processof sediment transport in reservoirs

Management of reservoir sedimentation by technical measures to influence density currents

Staumauer

Erodierbare Ablagerungen

Vorfluter

Feststoffmangel

FeststoffenbeladenerZuflusswährend Hochwasser

Geschiebebis zum Delta

Schwebstoffe amSeegrund

Stausee

Trübestrom

Abtauchpunkt Staumauer

Erodierbare Ablagerungen

Vorfluter

Feststoffmangel

FeststoffenbeladenerZuflusswährend Hochwasser

Geschiebebis zum Delta

Schwebstoffe amSeegrund

Stausee

Trübestrom

Abtauchpunkt

Delta formed by bedload

Sediment-laden river inflow during floods Plunging point Dam

Erodable deposits

Reservoir

Density current

Suspended sedimentat bottom

ÉC OLE POLY TEC H NIQU EFÉDÉRALE D E LAUSAN NE

Laboratoire de constructions hydrauliques

TeachingGraduate courses (Master)• Hydraulic structures• Dams and appurtenant structures• Urban hydraulic systems• Flood protection measures andriver training works

• Contracts and construction law• Hydraulic and energy networks• Water and energy economics• River morphology• Surface water management

Undergraduate courses (Batchelor)• Hydraulics of structures• Infrastructures and landscape planning

ÉC OLE POLY TEC H NIQU EFÉDÉRALE D E LAUSAN NE

Laboratoire de constructions hydrauliques

Services

State-of-the-art equipment

Staff: 20 to 30 persons

Hall of 500 m2 allocatedto scale model testing(research and services)

ÉC OLE POLY TEC H NIQU EFÉDÉRALE D E LAUSAN NE

Laboratoire de constructions hydrauliques

Postgraduate studies

in hydraulic schemes

Participants1999-2001: 26, 15 Swiss, 11 international students from 11 countries2001-2003: 24, 11 Swiss, 13 international students from 9 countries2003-2005: 21, 7 Swiss, 14 international students from 10 countries