2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/25/2021 | 2:00 PM - 3:30 PM | DISSOLVED OXYGEN DYNAMICS IN THE HYPORHEIC ZONE OF THE EAST RIVER, COLORADO | Virtual Platform

DISSOLVED OXYGEN DYNAMICS IN THE HYPORHEIC ZONE OF THE EAST RIVER, COLORADO

Dissolved oxygen (DO) is requisite for healthy aquatic ecosystems, however, few studies have focused on the long-term dynamics and controls of DO in hyporheic zones. Here we explore controls on hyporheic DO dynamics at 10, 20, and 35 cm depth beneath the East River, Colorado, from July-October, 2017 (normal water year) and April to October, 2018 (low flow water year). We expect hyporheic DO is supplied by the surface water and therefore negatively correlated with vertical flux (q, estimated with VFLUX2 model, where q <0 is downwelling). We also predict that hyporheic DO removal (?DO<0; i.e., decrease from river) is controlled by heterotrophic microbial communities, which are likely to be more active at warmer temperatures. Thus, ?DO should be negatively correlated with temperature. Ubiquitously, we estimate downwelling at all depths. DO becomes anoxic briefly at 20 and 35 cm depths in 2017, and at all 3 depths for extended periods in 2018. Correlations between ?DO and temperature are not strong suggesting a dynamic microbial community (perhaps because of changes to their needs such as DOC) may be the reason for the temporal dynamics in this hyporheic zone.

Ecosystem Dynamics
Stream
Transport

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Presenters/Authors

Michael Gooseff (), University of Colorado, michael.gooseff@colorado.edu;