Protecting or restoring aquatic ecosystems in the face of growing anthropogenic pressures
requires an understanding of hydrological and biogeochemical functioning across multiple …

The use of environmental tracers to characterise time scales when investigating
groundwater is a technology that has been in use for half a century. Its usefulness is beyond …

Mathematical models of varying complexity have been developed since the 1960s to
interpret environmental tracer concentrations in groundwater flow systems. This review …

The water quality of Lake Rotorua has steadily declined over the past 50 years despite
mitigation efforts over recent decades. Delayed response of the groundwater discharges to …

Apparent ages obtained from the measured concentrations of environmental tracers have
the potential to inform recharge rates, flow rates, and assist in the calibration of groundwater …

Changes in the spatial distribution and flow-paths of water in a high-mountain, headwaters
watershed are evaluated using an integrated hydrologic model based on a heterogeneous …

This review presents the physical mechanisms generating residence time distributions
(RTDs) in hydrologic systems with a focus on steady-state analytical solutions. Steady-state …

Natural systems are driven by dynamic forcings that change in time as well as space,
behavior that is inherited by the system flow field and results in time‐varying age …

This paper investigates age mixing processes arising in advection‐dispersion models,
where large‐scale travel and residence time distributions can be explicitly calculated based …

The biogeochemical functioning of stream ecosystems is heavily dependent on water and
water‐borne nutrient fluxes between the stream itself and the streambed and banks (ie, the …