2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

5/25/2021 | 8:30 AM - 10:30 AM | RIVER REGULATION, HYPORHEIC EXCHANGE, AND STREAM SOLUTE DYNAMICS | Virtual Platform

RIVER REGULATION, HYPORHEIC EXCHANGE, AND STREAM SOLUTE DYNAMICS

Water exchange between a stream channel and hyporheic zone carries solutes from the channel to the benthic and hyporheic biotic communities that drive biogeochemical cycling in streams. Daily variation in river stage associated with hydropower dams creates a cyclical pattern of hydrologic gradients between the river and hyporheic zone. These gradients alternately drive water into and drain water from hyporheic storage, modifying the hyporheic hydrologic residence time distribution (RTD). However, such cyclical patterns of transient water storage-and-release do not replace normative patterns of hyporheic exchange, which often follow a power law RTD. We created a scalable model of transient (non-steady state) hyporheic exchange, storage, and nutrient uptake that simulates a power law RTD that is modified by pulses of water entering and exiting the hyporheic zone as a function of river regulation. Results suggest that the response of stream solute concentrations to flow regulation depends on the relationship between solute uptake kinetics and residence time in the hyporheic zone.

Flow regime
Models
Residence time

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Presenters/Authors

Geoffrey Poole (), Montana State University, Montana Institute on Ecosystems, gpoole@montana.edu ;