Research interests are focused on numerical modeling of the transport and fate of contaminants in surface water systems. Prior initiatives have included investigating the impacts of nutrients on stream algal growth and resulting dissolved oxygen spatial/temporal patterns, monitoring and modeling the transport of sediment and associated mercury in fluvial systems, and simulating the effects of non-point source pollutants on in-stream water quality. A secondary research theme has involved quantifying the impact of imperfect knowledge on the confidence associated with model predictions (uncertainty analysis).