Earl works in a range of fields in theoretical and applied hydrology, including stochastic hydrology and investigating pumped storage possibilities at Onslow (South Island) and Ngaruroro (North Island).
Research interests are:
- Developing hydrological models with optimal simplicity
- Agent-based groundwater models
- Pumped storage, hydro power hydrology, and data-based hydroclimatic forecasting
- Finite mixture models of solute transport in the environment