• Pollutant dispersion in rivers and river systems with pronounced heterogenetis, such as groynes or run-of-the-river reservoirs, including development of existing pollutant alarm modules used by river authorities.  
• Gas exchange at the air-water interface under the influence of different turbulence generating mechanisms
• Studies of flow instabilities and large-scale coherent structures in shallow flows (wide rivers, coastal regions), including transport and mixing of dissolved and suspended matter.  
• Topograpical effects for stratified flows in lakes or reservoirs.
• Mixing processes for pollutant discharges into water bodies in form of momentum or buoyant jets, including multiport diffuser devices. Development of PC-based expert systems (e.g CORMIX) for the qualitative description and quantitative forecast of mixing intensities for different water bodies.
• Suspended sediment dynamics in river and estuarial systems, including effectof salt stratification and associated contaminant adsorption processes.

The research of Building and Environmental Aerodynamics deals with the investigation of flow processes in the atmospheric boundary layer, in particular the interaction with buildings or other obstacles and the transport of pollutants in this region. Experimental studies in wind tunnels, the application of efficient numerical computational methods, and the development of improved measurement techniques are of major interest. Applied research studies are carried out in cooperation or as contractual work with industrial firms or government planning authorities in order to investigate specific projects or locations in terms of building design potimization or nvironmental efects (e.g environmental impact assessment).
Typical examinations in our laboratory include:

• Spreading of anthropogenic air pollutants in open or build-up acres, influence of thermally induced stratification effects in atmospheric flows.
• Traffic-induced pollutant transport and construction measures for urban climate improvement.
• Investigation of natural land surface features (e.g forest belts) as protective measures for pollutant sources and wind erosion.
• Analysis and optimization of flows in building interiors due to air supply and exhaust openings.
• Aerodynamic studies on wind effects on structures and buildings fluid dynamic feedback effects, e.g. bridges, highrise, buildings, industrial complexes, cooling towers. 

The protection of subsurface resources, such as soil and groundwater, requires the development of modern analysis techniques and remediation technologies. The major focus of the groundwater division lies in the evaluation and prediction of groundwater flow systems and their mass transport characteristics including multiphase solubilization processes. Laboratory and field experiments as well as numerical models are employed. The division works in close cooperation with geologists, geochemists and aquatic chemists in the development of predictive models for the design of remedial measures under economic and ecological constraints.

• Studies of groundwater flow in alluvial aquifers (simple porosity), fractured aquifers (discrete) and Karst systems (double porosity) and transport processes in heterogeneous aquifers.
• Experimental studies and numerical simulations for pollutant mobilization processes connected with remediation technologies such as the groundwater recirculation well (GZB), including multiple-scale laboratory and field experiments.
• Integration of exchange mechanisms between surface water and groundwater fluctuations  in floodway areas due to relocation of river dikes.
• Mass transport and transformation processes in the nearfield of leaky sewage pipes, including development of expert  systems for analysis and prediction of groundwater quality consequences.