The effect of unsteady streamflow and stream-groundwater interactions on oxygen consumption in a sandy streambed.

ABSTRACT: Streamflow dynamics are often ignored when studying biogeochemical processes in the hyporheic zone. We explored the interactive effects of unsteady streamflow and groundwater fluxes on the delivery and consumption of oxygen within the hyporheic zone using a recirculating flume packed with natural sandy sediments. The flume was equipped with a programmable streamflow control and drainage system that was used to impose losing and gaining fluxes. Tracer tests were used to measure hyporheic exchange flux and a planar optode was used to measure subsurface oxygen concentration patterns. It was found that the volume of the oxic zone decreased when the losing flux declined, and was drastically decreased when gaining conditions were applied. It was also found that unsteady streamflow led to a sligh

SUBMITTER: Galloway J 

PROVIDER: S-EPMC6930257 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature