2010
O’Connor, Ben L.; Hondzo, Miki; Harvey, Judson W.
Predictive Modeling of Transient Storage and Nutrient Uptake: Implications for Stream Restoration Journal Article
In: Journal of Hydraulic Engineering, vol. 136, pp. 1018-1032, 2010.
Abstract | Links | BibTeX | Tags: Fluvial Hydraulics, Nutrient loads, restoration, Surface waters, Transport phenomena
@article{O’Connor2010,
title = {Predictive Modeling of Transient Storage and Nutrient Uptake: Implications for Stream Restoration},
author = {Ben L. O’Connor and Miki Hondzo and Judson W. Harvey},
url = {https://angelo.berkeley.edu/wp-content/uploads/sites/59/OConnor_2010_JoHydrEngineer.pdf},
doi = {10.1061/ASCEHY.1943-7900.0000180},
year = {2010},
date = {2010-01-01},
journal = {Journal of Hydraulic Engineering},
volume = {136},
pages = {1018-1032},
abstract = {This study examined two key aspects of reactive transport modeling for stream restoration purposes: the accuracy of the nutrient spiraling and transient storage models for quantifying reach-scale nutrient uptake, and the ability to quantify transport parameters using measurements and scaling techniques in order to improve upon traditional conservative tracer fitting methods. Nitrate (NO−3)(NO3−) uptake rates inferred using the nutrient spiraling model underestimated the total NO−3NO3− mass loss by 82%, which was attributed to the exclusion of dispersion and transient storage. The transient storage model was more accurate with respect to the NO−3NO3− mass loss (±20%) and also demonstrated that uptake in the main channel was more significant than in storage zones. Conservative tracer fitting was unable to produce transport parameter estimates for a riffle-pool transition of the study reach, while forward modeling of solute transport using measured/scaled transport parameters matched conservative tracer breakthrough curves for all reaches. Additionally, solute exchange between the main channel and embayment surface storage zones was quantified using first-order theory. These results demonstrate that it is vital to account for transient storage in quantifying nutrient uptake, and the continued development of measurement/scaling techniques is needed for reactive transport modeling of streams with complex hydraulic and geomorphic conditions.},
keywords = {Fluvial Hydraulics, Nutrient loads, restoration, Surface waters, Transport phenomena},
pubstate = {published},
tppubtype = {article}
}
This study examined two key aspects of reactive transport modeling for stream restoration purposes: the accuracy of the nutrient spiraling and transient storage models for quantifying reach-scale nutrient uptake, and the ability to quantify transport parameters using measurements and scaling techniques in order to improve upon traditional conservative tracer fitting methods. Nitrate (NO−3)(NO3−) uptake rates inferred using the nutrient spiraling model underestimated the total NO−3NO3− mass loss by 82%, which was attributed to the exclusion of dispersion and transient storage. The transient storage model was more accurate with respect to the NO−3NO3− mass loss (±20%) and also demonstrated that uptake in the main channel was more significant than in storage zones. Conservative tracer fitting was unable to produce transport parameter estimates for a riffle-pool transition of the study reach, while forward modeling of solute transport using measured/scaled transport parameters matched conservative tracer breakthrough curves for all reaches. Additionally, solute exchange between the main channel and embayment surface storage zones was quantified using first-order theory. These results demonstrate that it is vital to account for transient storage in quantifying nutrient uptake, and the continued development of measurement/scaling techniques is needed for reactive transport modeling of streams with complex hydraulic and geomorphic conditions.