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StefanHG

Research Abstracts Online
January - December 2011

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University of Minnesota Twin Cities
College of Science and Engineering
Department of Civil Engineering
St. Anthony Falls Laboratory

PI: Heinz G. Stefan, Associate Fellow

Simulations and Analysis of Physical, Chemical, and Biological Processes Affecting Water Quality in Freshwater

These researchers have developed deterministic, unsteady, year-round lake and stream water quality/ecosystem simulation models and are expanding, validating, and applying them. These models simulate a multitude of physical, chemical and biological processes and give, for example, water temperature, dissolved oxygen, primary productivity, and fish habitat distributions in various classes of lakes, rivers, and streams, including both open-water conditions and the ice-cover period. Simulations can be made for continuous long-term periods (e.g. 30 years), or for periods of a few days on individual water bodies with high temporal resolution. Current work includes simulations of the distribution of wind stress in the atmospheric boundary layer over a lake surface, solute transport across a sediment/water interface in streams and lakes, and effects of hydrothermal processes in watersheds at various stages of urban development on coldwater (trout) streams. MSI resources are used directly in the simulation of lake and stream water quality or for data analysis. Current work includes large massively parallel turbulence simulations of atmospheric flows over complex terrain to develop advanced boundary conditions for the lake model.

Group Members

Timothy Erickson, Graduate Student
Makoto Higashino, Oita National College of Technology, Oita, Japan
Corey Markfort, Graduate Student
Qin Qian, Department of Civil Engineering, Lamar University, Beaumont, Texas
Craig Taylor, Graduate Student