My interests in chemical and physical processes in aquatic environments were initially focused on groundwater, catchment/hillslope hydrology, channel flow, transport processes and their controls on biological productivity. Over time these interests expanded to include terrestrial biogeochemical processes, soil dynamics and land-atmosphere interactions.
My research has been largely concerned with the hydrology and biogeochemistry of low-order streams, small lakes and their catchments and coastal and estuarine systems. Knowledge of processes operating within these small systems is essential for understanding the fate of non-point-source pollutants (such as acid rain), for estimating the ecological effects of large-scale environmental perturbations (such as climate change), and for examining the implications of environmental policy (such as land use management).
Underlying my interests in biogeochemical processes and the scales of ecosystem response is a strong commitment to the use of models and quantitative methods for integrating and interpreting research data. I am particularly interested in the development and application of quantitative techniques for studying the dynamic behaviour of large-scale aquatic and terrestrial systems. I use various methods of numerical simulation, time series analysis, statistical inference and hypothesis testing, Monte Carlo simulation and recursive parameter estimation in conjunction with empirical and mathematical models of ecosystem dynamics to identify and quantify the important processes operating within ecosystems. I am particularly interested in using these models as tools for increasing scientific understanding of catchment processes and (through their application at landscape and regional scales) as tools for knowledge transfer and environmental decision-making.
Over 30 years of research experience in the USA, Canada and Europe, focusing on the hydrology and biogeochemistry of low-order streams, small lakes, headwater catchments, and coastal and estuarine systems.
Research Professor of Environmental Sciences, Fellow of Brown College, and Co-director of the Shenandoah Watershed Study Program, all at the University of Virginia (still held on a part-time honorary basis).
Adjunct Professor in the Environmental and Life Sciences Graduate Program at Trent University in Canada, and a Distinguished Visiting Scholar in the School of Geography at Oxford University.
BS in Chemistry, University of Virginia, USA
PhD degree from the Department of Environmental Sciences at the University of Virginia, USA, in aquatic ecology, working on the light-photosynthesis relationships found in aquatic macrophytes and on freshwater eutrophication problems in general.