2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/06/2017 | 3:00 PM - 3:15 PM | THEORETICAL INCONSISTENCIES BETWEEN WHOLE-STREAM UPTAKE KINETICS INFERRED FROM SYNTHETIC CONSTANT-RATE AND INSTANTANEOUS RELEASE TRACER EXPERIMENTS | 306A
THEORETICAL INCONSISTENCIES BETWEEN WHOLE-STREAM UPTAKE KINETICS INFERRED FROM SYNTHETIC CONSTANT-RATE AND INSTANTANEOUS RELEASE TRACER EXPERIMENTS
Increasing numbers of field studies are using reactive tracer experiments to estimate saturating uptake kinetics for stream reaches. Yet there has been little theoretical investigation of the consistency among the various field approaches to gather the necessary breakthrough curve data for inference of whole-stream kinetic model parameters. We constructed a simple one-dimensional solute transport model of advection, longitudinal dispersion, and hyperbolic saturating kinetics, and we ran paired multi-level-constant-rate and instantaneous-release synthetic tracer experiments in hypothetical stream reaches. Conventional approaches for analyzing data from these experiments were applied to the constant-rate (multi-level release) and instantaneous (TASCC) simulated results, and comparisons demonstrated substantial differences between the kinetic parameter estimates recovered from the simulated breakthrough curves. Furthermore, kinetic parameter estimates from the synthetic instantaneous experiment were substantially different from the kinetic parameters used for the underlying stream simulation. We present numerical experiments that provide evidence of the mechanisms behind these differences and suggest that longitudinal dispersion may be a neglected control on active to conservative tracer concentration ratios in instantaneous release experiments.
- C10 Biogeochemistry
- C10 Biogeochemistry
- C10 Biogeochemistry
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Presenters/Authors
Robert Payn
(), Montana State University, Montana Institute on Ecosystems, rpayn@montana.edu;
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Steven Thomas
(), School of Natural Resources, University of Nebraska-Lincoln, Lincoln, sthomas5@unl.edu;
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Tim Covino
(), Colorado State University, Tim.Covino@ColoState.EDU;
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Lauren Koenig
(), University of New Hampshire, lauren.koenig@unh.edu;
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