Loss of Bromide in a Wetland Tracer Experiment

Whitmer, Shawn; Baker, Larry; Wass, Roland

doi:10.2134/jeq2000.00472425002900060043x

Cited by 49 publications

(35 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This method has been the most common analysis procedure for assessing wetland RTD data in the last three decades (Thackston et al, 1987;Whitmer et al, 2000;Wang and Jawitz, 2006;Keefe et al, 2010). In accordance with this method, the outlet pulse of the tracer was given by…”

Section: The Methods Of Moments Analysis Of Residence Time Distributionmentioning

confidence: 99%

“…Wetland hydraulic parameters can be derived from the RTD by using the method of moments, which is based on numerical integration (Kadlec, 1994;Whitmer et al, 2000;Martinez and Wise, 2003;Wang and Jawitz, 2006;Muñoz et al, 2006), or by modelling of the RTD using probability distribution functions, such as the Gauss function (Levenspiel, 1972;Serra et al, 2004;Fogler, 2006). The main advantage of the method of moments analysis of the RTD is that the hydraulic parameter values are attained directly from the measured data.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tracer behaviour and analysis of hydraulics in experimental free water surface wetlands

Bodin

Mietto

Ehde

et al. 2012

Ecological Engineering

View full text Add to dashboard Cite

Section: The Methods Of Moments Analysis Of Residence Time Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tracer behaviour and analysis of hydraulics in experimental free water surface wetlands

Bodin

Mietto

Ehde

et al. 2012

Ecological Engineering

View full text Add to dashboard Cite

“…The selected Br − tracer was shown to be a suitable tracer for on-farm wetlands by [37]. Moreover, Br − is a nonreactive ion, found at low background concentrations, has a low toxicity, and requires a simple analysis [38].…”

Section: Residence Time Monitoringmentioning

confidence: 99%

Performance of an Agricultural Wetland-Reservoir-Irrigation Management System

Haverstock

Madani

Baldé

et al. 2017

Water

View full text Add to dashboard Cite

Constructed wetlands (CW) have gained recognition as a management option for the treatment of various agricultural wastewaters. This study involved the design, construction, and initial evaluation of a wetland-reservoir-irrigation (WRI) system. The system was established in Truro, Nova Scotia, Canada, with the goal to capture, treat, and re-use agricultural sub-surface drainage water. It consisted of a 1.8-ha area of a cropped field that was systematically tile drained. Drainage water was directed through a 2-cell CW and then into a reservoir-irrigation pond. Flow rate hydraulics, residence time distributions, and treatment efficiencies for nitrate-nitrogen (NO 3 − -N) and Escherichia coli (E. coli) were monitored for 14 months. Mass reductions of NO 3 − -N and E. coli from the CW were 67.6% and 63.3%, respectively. However, average E. coli concentrations increased to 178 CFU 100 mL −1 in the reservoir during the warm season. It may therefore be best to use reservoir water for irrigation of crops that are not consumed raw. To aid in the future design of similar systems, mean first-order rate constants (k s ) for NO 3 − -N and E. coli were calculated to be 8.0 and 6.4 m y −1 , respectively. The volume of water collected in the reservoir exceeded typical irrigation requirements of the drained land and could therefore provide irrigation to additional land beyond the drainage area.

show abstract

“…Nitrate removal was then estimated from the changes in NO 3 À : Br À ratios and NO 3 À and Br À mass with time, assuming that Br À is not taken up by plants or processed by soil microorganisms (Schnabel et al 1996;Whitmer et al 2000). Addy et al (2002) successfully demonstrated the use of the push-pull method to determine in-situ subsurface water denitrification and NO 3 À removal rates in riparian zones.…”

Section: Introductionmentioning

confidence: 99%

Nitrous oxide generation, denitrification, and nitrate removal in a seepage wetland intercepting surface and subsurface flows from a grazed dairy catchment

Zaman¹,

Nguyen

Gold

et al. 2008

Soil Res.

View full text Add to dashboard Cite

Abstract.Little is known about seepage wetlands, located within agricultural landscapes, with respect to removing nitrate (NO 3 À ) from agricultural catchments, mainly through gaseous emissions of nitrous oxide (N 2 O) and dinitrogen (N 2 ) via denitrification. These variables were quantified using a push-pull technique where we introduced a subsurface water plume spiked with 15 N-enriched NO 3 À and 2 conservative tracers [bromide (Br À ) and sulfur hexafluoride (SF 6 )] into each of 4 piezometers and extracted the plume from the same piezometers throughout a 48-h period. To minimise advective and dispersive flux, we placed each of these push-pull piezometers within a confined lysimeter (0.5 m diameter) installed around undisturbed wetland soil and vegetation. Although minimal dilution of the subsurface water plumes occurred, NO 3 À -N concentration dropped sharply in the first 4 h following dosing, such that NO 3 À -limiting conditions (<2 mg/L of NO 3 -N) for denitrification prevailed over the final 44 h of the experiment. Mean subsurface water NO 3 À removal rates during non-limiting conditions were 15.7 mg/L.day. Denitrification (based on the generation of isotopically enriched N 2 O plus N 2 ) accounted for only 7% (1.1 mg/L.day) of the observed groundwater NO 3 À removal, suggesting that other transformation processes, such as plant uptake, were responsible for most of the NO 3 À removal. Although considerable increases in 15 N-enriched N 2 O levels were initially observed following NO 3 À dosing, no net emissions were generated over the 48-h study. Our results suggest that this wetland may be a source of N 2 O emissions when NO 3 À concentrations are elevated (non-limited), but can readily remove N 2 O (function as a N 2 O sink) when NO 3 À levels are low. These results argue for the use of engineered bypass flow designs to regulate NO 3 À loading to wetland denitrification buffers during high flow events and thus enhance retention time and the potential for NO 3 À -limiting conditions and N 2 O removal. Although this type of management may reduce the full potential for wetland NO 3 À removal, it provides a balance between water quality goals and greenhouse gas emissions.

show abstract

Loss of Bromide in a Wetland Tracer Experiment

Cited by 49 publications

References 0 publications

Tracer behaviour and analysis of hydraulics in experimental free water surface wetlands

Tracer behaviour and analysis of hydraulics in experimental free water surface wetlands

Performance of an Agricultural Wetland-Reservoir-Irrigation Management System

Nitrous oxide generation, denitrification, and nitrate removal in a seepage wetland intercepting surface and subsurface flows from a grazed dairy catchment

Contact Info

Product

Resources

About