Current basic research in the areas of environmental hydrodynamics and water quality modeling in natural and manmade water systems. This includes modeling of heat transfer and temperature regimes of lakes and rivers, dispersion and mixing in lakes and reservoirs, dissolved oxygen dynamics, ice covers, and water quality at the sediment-water interface. These topics are also investigated in experimental field and laboratory studies. Applied research on the design of hydraulic facilities, specifically intake and outlet structures, stormwater handling facilities, and lake and reservoir water quality improvement techniques.

Dr. Stefan conducts his research at the St. Anthony Falls Laboratory.

Education

• Dipl. Ing., 1959, Civil Engineering, Technical University of Munich, Germany
• Ing. Hydraulicien, 1960, University P. Sabatier, Toulouse, France
• Dr.-Ing., 1969, Hydromechanics, University P. Sabatier, Toulouse, France

Professional Background

• Research Engineer, Fluid Mechanics Institute, University of Toulouse/ENSEEHT, France, 1960-63
• Chief Engineer and Lecturer, Water Resources Engineering Research Institute, Technical University, Berlin, 1965-67

Selected Publications

Higashino, M. and H.G. Stefan. 2005. Oxygen demand by a sediment bed of finite length. Journal of Environmental Engineering, ASCE, 131(3): 350-358.

Herb, W.H. and H. G. Stefan. 2005. Dynamics of vertical mixing in a shallow lake with submersed macrophytes. Water Resources Research 41(6): W02023. doi:10.1029/2003WR002613.

Higashino, M. and H.G. Stefan. 2004. Diffusive boundary layer development above a sediment/water interface. Water Environment Research, 76(4): 292-300.

Manous J., Jr. and H. G. Stefan. 2004. Sulfate distribution in a multi-basin saline lake. Hydrobiologia, 529: 169-185.

Williams, G.S., K.L. Layman and H.G. Stefan. 2004. Dependence of lake ice covers on climatic, geographic and bathymetric variables. Cold Regions Science and Technology, 40(3): 145-164.

Bogan, T.R., H.G. Stefan and O. Mohseni. 2004. Imprints of secondary heat sources on the stream temperature/equilibrium temperature relationship. Water Resources Research, 40(12).

Fang, X., H.G. Stefan, J.G. Eaton, J.H.McCormick and S.R. Alam. 2004. Simulated fish habitat in lakes of the contiguous U.S. under different climate scenarios. Part 1: Cool-water fish. Ecological Modelling, 172:13-68.

Gao, S. and H.G. Stefan. 2004. Potential climate warming effects on ice characteristics of five freshwater lakes. Journal of Hydrological Engineering, ASCE, 130(3): 226-34.

Higashino, M., Gantzer, C.J. and H.G. Stefan. 2004. Unsteady diffusional mass transfer at the sediment/water interface: Theory and significance for SOD measurements. Water Research, 38: 1-12.

Gantzer, C.J. and H.G. Stefan. 2003. A model of microbial activity in lake sediments in response to periodic water column mixing. Water Research, 37: 2833-46.