Journal Highlights

The importance and challenge of hyporheic mixing

Editor’s Highlight—


This Commentary discusses the possible processes that cause mixing of stream water and groundwater in the hyporheic zone in the light of literature on mixing processes and mixing controlled reactions in porous media and aquifers. The authors suggest new areas for research based on the observation that hyporheic zones mix more than would be expected based on groundwater flow theory. Understanding what causes hyporheic mixing is a relevant and timely research question as it could improve our ability to simulate and predict the attenuation of solutes in the hyporheic zone and, at the same time, allow for a more mechanistically informed interpretation of field results, for example, from stream tracer experiments.