2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 8:30 AM - 10:30 AM | STREAMS AS HYDRO-BIOGEOCHEMICAL BIOREACTORS: EMPLOYING DAMKÖHLER NUMBERS TO IDENTIFY KEY REACTIVE TRANSPORT CONSTRAINTS ON WATER QUALITY | Virtual Platform
STREAMS AS HYDRO-BIOGEOCHEMICAL BIOREACTORS: EMPLOYING DAMKÖHLER NUMBERS TO IDENTIFY KEY REACTIVE TRANSPORT CONSTRAINTS ON WATER QUALITY
We explore the conceptual model that geomorphic process domains function as hydro-biogeochemical bioreactors, consisting of a non-reactive flow compartment and a reactive-storage compartment. We simulated the reactive transport of a generic solute in a suite of streams, calculating Damköhler numbers for the reactive-storage compartment (hyporheic zone) and whole reactor (stream reach integrating the non-reactive channel compartment and hyporheic zone). We approximated hyporheic hydraulics with power-law residence-time distributions and assumed advective transport of solutes to hyporheic zones. We systematically varied the reaction-rate constant of the solute, hyporheic-zone size, and shape of the hyporheic residence-time distribution, holding the following constant: stream-channel geometry, surface-water discharge, and solute loading. Hyporheic Damköhler numbers were positively related to longer average residence times and the reaction-rate constant. However, effective Damköhler numbers for stream reaches were positively related to hyporheic-zone size and shorter average residence times. We explored scenarios that demonstrate how the amount of water flowing through the hyporheic zone can be more important than the hyporheic Damköhler number in determining the Damköhler number of the reach. Our approach shows promise for scaling hyporheic biogeochemical observations to predict whole-system solute dynamics.
- Biogeochemistry
- Stream
- Residence time
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Presenters/Authors
Ann Marie Reinhold
(), Montana State University, Montana Institute on Ecosystems, reinhold@montana.edu;
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Stephanie Ewing
(), Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, USA, stephanie.ewing@montana.edu;
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Robert Payn
(), Montana State University, Montana Institute on Ecosystems, rpayn@montana.edu;
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Geoffrey Poole
(), Montana State University, Montana Institute on Ecosystems, gpoole@montana.edu ;
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Maury Valett
(), University of Montana, Maury.Valett@mso.umt.edu;
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