1. Institut für Hydromechanik Gerhard H. Jirka Memorial Lecture H. Herlina, C. Lang, A. Haug Institute for Hydromechanics Karlsruhe Institute of Technology (KIT) Speaker : J. Wissink School of Engineering and Design University of Brunel, Middlesex, U.K.

2. Institut für Hydromechanik 2 GTWS 6, Kyoto, 17-21 May 2010 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, 2010 Photo: Dr. R. Ermshaus2008

3. Institut für Hydromechanik 3 GTWS 6, Kyoto, 17-21 May 2010 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), 2006 Karl Emil Hilgard Hydraulic Prize (ASCE), 2009 Vice President of IAHR 2004 – 2009 Photo: Dr. R. Ermshaus2009

4. Institut für Hydromechanik 4 GTWS 6, Kyoto, 17-21 May 2010 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 communities Dr. Herlina, Prof. Jirka, Prof. Plate, Prof. Jähne, 2005

5. Institut für Hydromechanik 5 GTWS 6, Kyoto, 17-21 May 2010 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 m 2, IfH Environmental Fluid Mechanics (1995 – 2010)

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

7. Institut für Hydromechanik 7 GTWS 6, Kyoto, 17-21 May 2010 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 Environmental Fluid Mechanics (1995 – 2010)

8. Institut für Hydromechanik 8 GTWS 6, Kyoto, 17-21 May 2010 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 Environmental Fluid Mechanics (1995 – 2010) Experiment: 1,8 m width flume, IfH

9. Institut für Hydromechanik 9 GTWS 6, Kyoto, 17-21 May 2010 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. Environmental Fluid Mechanics (1995 – 2010)

10. Institut für Hydromechanik 10 GTWS 6, Kyoto, 17-21 May 2010 Mixing and transport processes for pollutant discharges  Expert system CORMIX  Marine outfall systems and brine discharge Complexity of construction as well as mixing and transport processes in the nearfield and farfield Environmental Fluid Mechanics (1995 – 2010) 3D Modelling of mixing and transport processes point source Mixing area (farfield)

11. Institut für Hydromechanik 11 GTWS 6, Kyoto, 17-21 May 2010 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

12. Institut für Hydromechanik 12 GTWS 6, Kyoto, 17-21 May 2010 Jirka‘s Contribution to the Study of Gas Transfer Laboratory 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 t o appear in Exp Fluids DNS computations (on going) 6 mm