Helen's research examines:
- The impacts of phosphorus and nitrogen from agriculture and wastewater, on water quality and the vital instream ecosystem services which sustain our river environments. A major focus is phosphorus in rivers, from UK to global perspectives, driven by societal concerns about the role of phosphorus in eutrophication: a pervasive threat to water quality and water security.
- Macronutrient (phosphorus, nitrogen and carbon) fluxes and cycles from field to catchment scales, and the processes controlling transfers of macronutrients along the continuum from headwater streams to the river basin scale.
- The sources and biogeochemical cycling of macronutrients in rivers, and the impacts of nutrient enrichment and remediation on the ecological status of rivers, in relation to changing agricultural practice, rural and urban land use, and climate variability.
Helen is an Adjunct Professor in Fluvial Sciences at the University of Arkansas, USA; a Visting Professor in Environmental Chemistry at Plymouth University, UK; and a Visiting Professor at the University of Tokyo, Japan.