EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)

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5/25/2021 | 2:00 PM - 3:30 PM | MODELING THE INFLUENCE OF HYPORHEIC HETEROGENEITY ON STREAM SOLUTE DYNAMICS | Virtual Platform

MODELING THE INFLUENCE OF HYPORHEIC HETEROGENEITY ON STREAM SOLUTE DYNAMICS

Biogeochemical cycling within hyporheic zones can substantially influence stream solute dynamics, yet quantifying this influence at the scale of stream reaches and networks is challenged by the need to represent both hyporheic hydrology and biogeochemistry. By conceptualizing an arbitrarily complex relationship between solute concentration and hyporheic water age while considering a power law hyporheic residence time distribution, we developed a mathematical model for simulating the influence of hyporheic flowpath biogeochemistry on entire stream reaches. To assess model predictions of both hyporheic hydrology and biogeochemistry, we conducted a co-release of conservative (salt) and reactive (nitrate) tracer in a recirculating flume with a sinusoidal dune comprised of stream-incubated gravel. We measured conductivity and nitrate concentrations several times following the release and fit our simulation model to both time series. Our approach provides a simple way to incorporate hyporheic heterogeneity into models of solute dynamics at stream reach and network scales.

Biogeochemistry
Models
Residence time

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Presenters/Authors

Elizabeth Mohr (), Montana State University, elizabethjmohr@gmail.com;