Journal article
Temporal Variations in Dissolved Oxygen Concentrations Observed in a Shallow Floodplain Aquifer
River research and applications, Vol.31(5), pp.576-589
06/2015
DOI: 10.1002/rra.2759
Abstract
Dissolved oxygen (DO) concentrations play an important role in many groundwater biogeochemial processes, yet assessments of temporal variations are lacking. In this study, we examined daily DO concentrations using a continuously-reading optical DO probe in a shallow floodplain setting in Iowa to (i) quantify fluctuations across two growing seasons; (ii) examine hydrologic controls on DO values; and (iii) model daily DO concentrations using easily measured variables. DO concentrations exhibited both rapid and long-term changes in concentrations over time, rapidly increasing and decreasing more than 1mg/l in response to precipitation recharge and stream stage increase over the span of several hours and days. On 40% of the monitoring days in this study, DO concentrations increased, on average, 0.2-0.4mg/l from oneday to the next. DO concentrations decreased approximately 5-6mg/l from spring through late summer and fall, likely owing to microbial and root respiration. Daily DO concentrations were successfully modelled using a combination of hydrologic (groundwater level and river stage) and temperature variables (r2>0.7). Improved understanding of temporal controls on groundwater DO patterns is needed to help clarify the dynamics of many biogeochemical processes.
Details
- Title: Subtitle
- Temporal Variations in Dissolved Oxygen Concentrations Observed in a Shallow Floodplain Aquifer
- Creators
- K. E. Schilling - Iowa Geological and Water Survey Iowa City Iowa USAP. J. Jacobson - Grinnell College
- Resource Type
- Journal article
- Publication Details
- River research and applications, Vol.31(5), pp.576-589
- Publisher
- Blackwell Publishing Ltd
- DOI
- 10.1002/rra.2759
- ISSN
- 1535-1459
- eISSN
- 1535-1467
- Number of pages
- 14
- Language
- English
- Date published
- 06/2015
- Academic Unit
- Earth and Environmental Sciences; IIHR--Hydroscience and Engineering
- Record Identifier
- 9984383893102771
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