Institut für Hydromechanik Gerhard H. Jirka Memorial Lecture H. Herlina, C. Lang, A. Haug Institute for Hydromechanics Karlsruhe Institute of Technology

Institut für Hydromechanik

Gerhard H. Jirka Memorial LectureH. Herlina, C. Lang, A. Haug

Institute for HydromechanicsKarlsruhe Institute of Technology (KIT)

Speaker : J. WissinkSchool of Engineering and Design

University of Brunel, Middlesex, U.K.

GTWS 6, Kyoto, 17-21 May 2010 Institut für Hydromechanik 2

Gerhard H. Jirka

Born : September 14th, 1944

Agricultural University of Vienna

Massachusetts Institute of Technology(1969 – 1977)

Cornell University(1977 – 1995)

Founding director of DeFrees Hydraulics Laboratory (1984)

University of Karlsruhe /Karlsruhe Institute of Technology (KIT)

(1995 – 2010)

Died : February 14th, 2010Photo: Dr. R. Ermshaus2008


Gerhard H. Jirka Research topic: Environmental Fluid Mechanics – aspects of water quantity,

water quality and transformation aspects

U.S. Patent Jirka et al."Submerged Multiport Diffusers for

Cooling Water Discharge"

Since 1986 CORMIX Expertsystem (funded by US EPA)

14 Honors and Awards:Arthur T. Ippen Award of the (IAHR), 1989

Hunter Rouse Hydraulic Eng. Award (ASCE), 2006Karl Emil Hilgard Hydraulic Prize (ASCE), 2009

Vice President of IAHR 2004 – 2009Photo: Dr. R. Ermshaus2009


Gerhard H. Jirka Excellent Teacher

Devoted Doktorvater(more than 30 PhD)

Outstanding and visionary Researcher in Environmental Fluid Mechanics

(more than 230 journal and conference proceeding publications,

as well as 17 books and invited chapters)

Esteemed Colleague with great enthusiasm, dedication and energy

٭٭٭His spirit and example will remain among us

and will continue to live in the research and academic communitiesDr. Herlina, Prof. Jirka, Prof. Plate, Prof. Jähne, 2005


Shallow water flows

Flow instabilities and large-scale coherent structures (theory, experiment and numerical simulation)

Velocity field and mass transport in a vortex street-like shallow wake around cylindrical structure (e.g. islands) in turbulent mean flow. In large, stable vortex high mass concentration will be transported without mixing with the surrounding fluid flow

Experiment: Shallow water bassin 15 x 6 m2, IfH

Environmental Fluid Mechanics (1995 – 2010)


Environmental Fluid Mechanics (1995 – 2010)Shallow flow vortex dynamics

Development and stability of shallow flow vortices (theory,experiment)

Experiment: Shallow water basin 1,7 x 1,7 m2, IfH

Streamlines and vorticity map of the dipole vortex created by the synchronized movement of two flaps. The blue and red coloured patches represent the direction of rotation in counter-clockwise and clockwise, respectively.


Physics of solute transport

Shallow dead zone dynamics (theory, experiment)

Water quality and Alarm Models (1D, 3D numerical simulation)

Influence of dead-water zones like groyne fields on mass transport of dissolved substances, sediment transport and for stimulating the growth of aquatic species

Field: River Rhine (Waal) Experiment: 1,8 m width flume, IfH



Hydrodynamic processes at the water-sediment interface in stream beds Hydrodynamical loads within and above a porous gravel layer sediment motion (theory, experiment)

Measurements of flow velocity and pressure fluctuations with miniaturized piezo-resistant pressure sensors


Experiment: 1,8 m width flume, IfH


Stratified flows in coastal waters, lakes or reservoirs

Hydrodynamic instabilities and mixing processes (theory,experiment)

Experiment: 0,6 m width flume, IfH

Two-layer stratified exchange flow over a submerged sill experiment. Dense saline water (light colors) flows on the bottom from left to right, light fresh water (dark colors) on the top from right to left. The interface exhibits large surge-like flows due to unsteady baro-tropic forcing as well as smaller-scale Kelvin-Helmholtz billows.



Mixing and transport processes for pollutant discharges Expert system CORMIX Marine outfall systems and brine dischargeComplexity of construction as well as mixingand transport processes in the nearfield andfarfield


3D Modelling of mixing and transport processes

point source

Mixing area (farfield)


Jirka‘s Contribution to the Study of Gas Transfer

One of the initiators of this Symposium First Conference: June 1983 in Cornell,

organized by G.H. Jirka and W.H. Brutsaert

High ranking publications, e.g.

Brumley, B.H. and Jirka,G.H., 1987, “Near-Surface Turbulence in a Grid-Stirred Tank”,

J. Fluid Mechanics, Vol. 183, 235-263 (average citations/a: 3,17)

At IfH, Karlsruhe: Three projects on gas transfer funded by German Research Foundation (DFG),

2000 - 2010


Jirka‘s Contribution to the Study of Gas TransferLaboratory and Numerical Studies at IfH Karlsruhe

• Experiments with grid stirring (completed)

Herlina & Jirka, 2008, JFM 594, 183-208.

• Experiments with buoyant-convective turb (on going) Jirka, Herlina, Niepelt, 2010 to appear in Exp Fluids

• DNS computations (on going)

6 m

m

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Institut für Hydromechanik Gerhard H. Jirka Memorial Lecture H. Herlina, C. Lang, A. Haug Institute for Hydromechanics Karlsruhe Institute of Technology