Incorporating both physical and kinetic limitations in quantifying dissolved oxygen flux to aquatic sediments
Journal of Environmental Engineering
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Abstract
Traditionally, dissolved oxygen (DO) fluxes have been calculated using the thin-film theory with DO microstructure data in systems characterized by fine sediments and low velocities. However, recent experimental evidence of fluctuating DO concentrations near the sediment-water interface suggests that turbulence and coherent motions control the mass transfer, and the surface renewal theory gives a more mechanistic model for quantifying fluxes. Both models involve quantifying the mass transfer coefficient (k) and the relevant concentration difference (??C). This study compared several empirical models for quantifying k based on both thin-film and surface renewal theories, as well as presents a new method for quantifying ??C (dynamic approach) that is consistent with the observed DO concentration fluctuations near the interface. Data were used from a series of flume experiments that includes both physical and kinetic uptake limitations of the flux. Results indicated that methods for quantifying k and ??C using the surface renewal theory better estimated the DO flux across a range of fluid-flow conditions. ?? 2009 ASCE.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Incorporating both physical and kinetic limitations in quantifying dissolved oxygen flux to aquatic sediments |
| Series title | Journal of Environmental Engineering |
| DOI | 10.1061/(ASCE)EE.1943-7870.0000093 |
| Volume | 135 |
| Issue | 12 |
| Year Published | 2009 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Environmental Engineering |
| First page | 1304 |
| Last page | 1314 |
| Google Analytic Metrics | Metrics page |