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Expertise
My interests focus on the movement and transformation
of soluble contaminants in environmental systems. This has included the study of biological nitrification and
denitrification in biofilters and constructed wetlands and has extended to a study of the biogeochemical cycling
of nutrients and other contaminants in coastal and freshwater wetlands. To further our understanding of
these problems, we must be able to better describe why and when a contaminant travels from one material into
another, as from a sediment into a river, and to quantify the amount of solute mass which will
be transformed from one chemical species such as ammonium into another like nitrogen gas. For this
type of problem, the only method capable of a theory based description over a variety of temporal
and spatial scales is a mass-transfer model, which yields a system of differential equations. My research specialty
is formulating these systems so that they comply with theory in such a way that the models are
able teach us something about the underlying physical behavior.
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