2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 2:45 PM - 3:00 PM | WHAT WE CAN AND CAN NOT LEARN FROM THE GEOPHYSICAL IMAGING OF THE HYPORHEIC ZONE | 410 B
WHAT WE CAN AND CAN NOT LEARN FROM THE GEOPHYSICAL IMAGING OF THE HYPORHEIC ZONE
Researchers have long been trying to describe the size and dynamics of the hyporheic zone (HZ) and its effect on the stream’s ability to transform nutrients. Unfortunately, most of our knowledge of the HZ comes from flume experiments, which are too idealized to apply to the real world, and solute transport models, which are oversimplified and overfit, therefore muddying the link between the HZ and uptake. We used 3D geophysical imaging, electrical resistivity tomography (ERT), to measure the transfer of a conservative tracer (chloride) between surface waters and the HZ during and after a constant rate addition at 5 headwater streams. From the ERT data, we generated 3D representations of tracer abundance in the HZ through time. We also performed instantaneous additions of nitrate over the same 5 reaches to estimate uptake via TASCC. We analyzed the tracer breakthrough curves using a first-order mass transfer model in ReacTran, giving estimates of the rate of exchange and the size of the storage zone, and therefore HZ. From our experiments, we show how 3D ERT can better our understanding of how HZ size and dynamics influence nutrient transformation.
- Hydrology
- Biogeochemistry
- Modeling
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Presenters/Authors
Brady Kohler
(), University of Wyoming, kohlerbrady@gmail.com;
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Kevin Befus
(), University of Wyoming, kbefus@uwyo.edu;
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Brad Carr
(), University of Wyoming, bcarr1@uwyo.edu;
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Robert O. Hall
(), Flathead Lake Biological Station, University of Montana, bob.hall@flbs.umt.edu;
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