8L_Schleiss_1_

Missions

Laboratory of Hydraulic Constructions (LCH)

Director : Prof. Dr. Anton Schleiss

Maintain a permanent synergy between teaching, research and services

Laboratoire de constructions hydrauliques

ÉC O LE PO L Y TEC H N IQ U E FÉ DÉRA LE D E LA USAN NE

Field of activities Hydraulic engineering of infrastructures and systems ¾ ¾ ¾ ¾

water supply systems in rural and urban areas water resources management in catchment areas hydropower schemes and dams safety of hydraulic structures in view of extreme floods and their modelling

¾ river training works, flood protection and revitalisation measures

¾ safety and optimisation of complex hydraulic schemes

¾ coastal and harbour engineering in lakes ¾ protection measures against oil spills

Laboratoire de constructions hydrauliques

ÉC O LE PO L Y TEC H N IQ U E FÉ DÉRA LE D E LA USAN NE

General line of research Research concentrates on the interactions of hydraulic structures and schemes with their environment, in particular with water air and underground. It focusses essentially on topics Reservoir sedimentation due to turbidity currents 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 Scouring in river bends numercial simulations.

High velocity flow over macro-roughness

Rock scour due to high velocity jet impact

Laboratoire de constructions hydrauliques

ÉC O LE PO L Y TEC H N IQ U E FÉ DÉRA LE D E LA USAN NE

Energy dissipation and hydrodynamic forces of aerated flow over macro-roughness linings for overtopped embankment dams ¾ Goal: dissipate as much as possible of the flow energy with optimal macro-roughness linings ¾ Systems tested in laboratory (30°-18° inclined flume) and by numerical-modeling:

¾ Dissipating sources : Vortices Separation zones Transverse jets

Effects of macro-roughness: Diminution of the cavitation risks Increase of the flow resistance Creation of an additional drag force ⇒ Increase of energy dissipation by 40% to 60% compared to smooth slopes Laboratoire de constructions hydrauliques

ÉC O LE PO L Y TEC H N IQ U E FÉ DÉRA LE D E LA USAN NE

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

Katse Dam, Lesotho

laboratory

Physical process of scouring Fondamental research installation to analyse:

¾ Scour hole evolution ¾ Prevent dangerous erosion of dam foundation and valley side-slopes

¾ Turbulent flow in the pool ¾ Dynamic pressure at rock-water interface and propagation inside rock fissures ¾ Amplifying / damping effect of air Laboratoire de constructions hydrauliques

ÉC O LE PO L Y TEC H N IQ U E FÉ DÉRA LE D E LA USAN NE

Management of reservoir sedimentation by technical measures to influence density currents Feststoffenbeladener Sediment-laden Zufluss river inflow during während Hochwasser floods

Geschiebe Delta formed bisbedload zum Delta by

Boundary conditions Abtauchpunkt Plunging point

Schwebstoffe am Suspended sediment Seegrund at bottom

Staumauer Dam

Zufluss - Inflow Feststoffkonzentration - Sediment concentration

Stausee Reservoir

Density current Trübestrom Vorfluter Erodierbare Ablagerungen Erodable deposits

Feststoffmangel

Density currents are the main process of sediment transport in reservoirs

Zeit Time

Deposits

Erosion

Maps of erosion and deposits Bottom interaction

Research of technical measures by the help of physical and numerical modeling

Laboratoire de constructions hydrauliques

ÉC O LE PO L Y TEC H N IQ U E FÉ DÉRA LE D E LA USAN NE

Teaching Graduate courses (Master) • Hydraulic structures • Dams and appurtenant structures • Urban hydraulic systems • Flood protection measures and river 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 Laboratoire de constructions hydrauliques

ÉC O LE PO L Y TEC H N IQ U E FÉ DÉRA LE D E LA USAN NE

Services Staff: 20 to 30 persons

State-of-the-art equipment

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

Laboratoire de constructions hydrauliques

ÉC O LE PO L Y TEC H N IQ U E FÉ DÉRA LE D E LA USAN NE

Postgraduate studies in hydraulic schemes Participants 1999-2001: 2001-2003: 2003-2005:

26, 15 Swiss, 11 international students from 11 countries 24, 11 Swiss, 13 international students from 9 countries 21, 7 Swiss, 14 international students from 10 countries

Laboratoire de constructions hydrauliques

ÉC O LE PO L Y TEC H N IQ U E FÉ DÉRA LE D E LA USAN NE