Global groundwater storage and turnover
We combine global hydrologic and geologic datasets to quantify the timescales and sustainability of groundwater resources. We examine problems of groundwater quantity and quality across spatial scales using field studies and numerical models of groundwater flow and transport.

Coastal groundwater discharges
We study groundwater flow at and near coastlines, and how the groundwater flow in the terrestrial environment undergoes changes as the water approaches marine, lacustrine, or riverine systems. We use field data and numerical models to understand how groundwater interacts with coastal waters.

Mountainous groundwater systems
Groundwater systems in mountainous environments can be very complex and dominated by flowpaths through secondary porosity. We use a combination of field work, conceptual models, and numerical simulations to investigate the role of groundwater in mountain hydrologic budgets.