EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
6/05/2017 | 11:15 AM - 11:30 AM | TAILS FROM THE HYPORHEIC ZONE: DESCRIBING SOLUTE TURNOVER WITH 3D GEOPHYSICAL IMAGING | 302B
TAILS FROM THE HYPORHEIC ZONE: DESCRIBING SOLUTE TURNOVER WITH 3D GEOPHYSICAL IMAGING
The hyporheic zone (HZ) plays a large role in nutrient transformation, but it has proven difficult to fully describe both its temporal dynamics and hydrologic extent. Historically, field experiments have relied on a combination of well sampling and breakthrough curve analysis to describe the HZ. The incorporation of geophysical imaging, like electrical resistivity tomography (ERT), with tracer additions has allowed researchers to directly view the HZ in 2D. We conducted a series of constant-rate tracer additions in a small headwater mountain stream while collecting ERT images downstream yielding a 3D model of the HZ. We were able to measure the tracer downwelling deep into the subsurface and monitor how it flushed out over the course of several days following the addition. We calculated the volume of the HZ at each time step (about 2 hour intervals) and applied decay models describing solute turnover time similar to those used to describe breakthrough curve tails in the main channel. Moreover, we found the flushing behavior to be consistent with mobile and less-mobile zones where solutes exit the HZ at two distinct rates.
- C10 Biogeochemistry
- C36 Water Resource Management
- C14 Hydroecology & C33 Remote Sensing
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Presenters/Authors
Brady Kohler
(), University of Wyoming, kohlerbrady@gmail.com;
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Robert O. Hall
(), Flathead Lake Biological Station, University of Montana, bob.hall@flbs.umt.edu;
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Brad Carr
(), University of Wyoming, bcarr1@uwyo.edu;
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