Design and testing of a novel hypolimnetic oxygenation system to improve water quality in Lake Bard, California

Debroux, Jean-François; Beutel, Marc W.; Thompson, Craig M.; Mulligan, Susan B.

doi:10.1080/07438141.2012.716501

Cited by 15 publications

(7 citation statements)

References 21 publications

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“…In our parallel in situ mooring study, average anoxic P flux before re‐aeration was 11.42 ± 2.6 mg m −2 d −1 (Anderson et al, 2021). Our mean estimates are generally higher than previous estimates from the central basin, but our range of release rates is inclusive of sediment coring experiment estimates from other lakes such as Matisoff et al's 2016 western basin rates of 6.56 ± 6.05 mg m −2 d −1 , James (2012) who reported anoxic P flux of 8.3–12.5 mg m −2 d −1 for Lake of the Woods, Minnesota, and Debroux et al (2012) who estimated anoxic P flux of 6–8 mg m −2 d −1 from Lake Bard, California. Additionally, Lake Erie central basin P release rates are representative of other eutrophic lakes, (Phillips et al, 2020; Nürnberg, 1997).…”

Section: Resultsmentioning

confidence: 65%

Accelerated sediment phosphorus release in Lake Erie's central basin during seasonal anoxia

Anderson

Johengen

Miller

et al. 2021

Limnology & Oceanography

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Eutrophication remains a serious threat to Lake Erie and has accelerated over past decades due to human activity in the watershed. Internal phosphorus (P) loading from lake sediment contributes to eutrophication, but our understanding of this process in Lake Erie is more uncertain than for its riverine P inputs. Past study has focused on incubating sediment cores in oxic or anoxic conditions, meaning we know little about sediment flux during state transitions. We used 56 controlled sediment core incubation experiments to quantify rates and onset of P release in Lake Erie's central basin as a function of depositional environment, season (spring, summer, and fall), temperature, and dissolved oxygen (DO) concentration. P flux under oxic or hypoxic (> 0 to ≤ 2 mg L−1 DO) conditions was slow (0.31–0.50 mg m−2 d−1) compared to anoxic P flux (5.19–30.7 mg m−2 d−1). The transition between slow and fast flux occurred within 24 h of anoxia (0 mg L−1 DO). Oxic or anoxic P flux was generally similar across seasons and incubation temperatures (8°C and 14°C). In 14°C incubated cores anoxic P flux onset was earliest in fall, when sediments had already been exposed to anoxic conditions in the lake. Re‐oxygenation of experimental cores that temporarily developed anoxia reversed the direction of P flux, but P release resumed at similar rates once the water returned to anoxia. Understanding the effects of hypolimnion oxygen conditions on internal P loading allows us to better constrain nutrients sources and implications for P budget management.

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Section: Resultsmentioning

confidence: 65%

Accelerated sediment phosphorus release in Lake Erie's central basin during seasonal anoxia

Anderson

Johengen

Miller

et al. 2021

Limnology & Oceanography

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“…The result of this dynamic formation of hypoxia and anoxia is that sediments may undergo repeated switching between normoxic and hypoxic conditions and that nearshore areas of the central basin become anoxic before the offshore stations most commonly used to track long-term trends in hypoxia . Previous work has shown that the return of normoxic conditions results in rapid sorption of P back to the sediments, and experiments suggest that positive flux resumes rapidly once anoxia is re-established. , The hypolimnion of Lake Erie is not static, and hydrodynamic movements can disrupt water column stratification, contributing to the transient nature of anoxia and making it more difficult to quantify internal P loading. Measurements of hypolimnetic soluble reactive P (SRP) from discrete cruises , confirm that P accumulates within the hypolimnion after anoxia, but the exact onset and flux rate during anoxia are difficult to resolve at a specific location with discrete measurements at intervals of weeks or longer.…”

Section: Introductionmentioning

confidence: 99%

Continuous In Situ Nutrient Analyzers Pinpoint the Onset and Rate of Internal P Loading under Anoxia in Lake Erie’s Central Basin

et al. 2021

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Lake Erie's central basin experiences seasonal anoxia, contributing to internal sediment phosphorus (P) loading and exacerbating eutrophication. The precise conditions required for internal loading are poorly understood. This study constrains the timing and rates of internal P loading using continuous in situ temperature, dissolved oxygen (DO), and soluble reactive P (SRP) observations from two sites. SRP concentrations remained low during normoxia (>2 mg of DO L −1 ) and hypoxia (0−2 mg of DO L −1 ) but increased abruptly after anoxia for 12−42 h. SRP flux rate estimations varied, likely due to advection and hypolimnion thickness variation, but could still be reasonably quantified. Flux rates and standard errors during anoxia averaged 25.67 ± 5.5 mg m −2 day −1 at the shallower site and 11.42 ± 2.6 mg m −2 day −1 at the deeper site. At the shallower site, the anoxic hypolimnion was displaced with normoxic water, causing cessation of P flux until anoxia returned, and higher flux rates resumed immediately (89.1 ± 8.6 mg m −2 day −1 ), suggesting rapid, redox-controlled P desorption from surface sediments. On the basis of our rate and onset findings, the expected anoxic area and duration in the basin could yield an annual internal SRP load comparable to the annual central basin TP tributary load of 10000−11000 metric tonnes.

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“…In deeper lakes, when using oxygen gas, most of the bubbles dissolve within the hypolimnion and the upward momentum generated by the plume is low enough to prevent significant disruption of the thermocline. When correctly designed and operated, these systems are often very successful at mitigating hypoxia and its associated effects [Beutel, 2006;Gantzer et al, 2009a;Liboriussen et al, 2009;Debroux et al, 2012;M€ uller et al, 2014]. In addition to increased hypolimnetic DO concentrations, bubble-plume operation can also result in enhanced turbulent mixing on localized scales in lakes and reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Increased sediment oxygen flux in lakes and reservoirs: The impact of hypolimnetic oxygenation

Bierlein

rezvani

Socolofsky

et al. 2017

Water Resources Research

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Hypolimnetic oxygenation is an increasingly common lake management strategy for mitigating hypoxia/anoxia and associated deleterious effects on water quality. A common effect of oxygenation is increased oxygen consumption in the hypolimnion and predicting the magnitude of this increase is the crux of effective oxygenation system design. Simultaneous measurements of sediment oxygen flux (J O2) and turbulence in the bottom boundary layer of two oxygenated lakes were used to investigate the impact of oxygenation on J O2. Oxygenation increased J O2 in both lakes by increasing the bulk oxygen concentration, which in turn steepens the diffusive gradient across the diffusive boundary layer. At high flow rates, the diffusive boundary layer thickness decreased as well. A transect along one of the lakes showed J O2 to be spatially quite variable, with near-field and far-field J O2 differing by a factor of 4. Using these in situ measurements, physical models of interfacial flux were compared to microprofile-derived J O2 to determine which models adequately predict J O2 in oxygenated lakes. Models based on friction velocity, turbulence dissipation rate, and the integral scale of turbulence agreed with microprofile-derived J O2 in both lakes. These models could potentially be used to predict oxygenation-induced oxygen flux and improve oxygenation system design methods for a broad range of reservoir systems.

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Design and testing of a novel hypolimnetic oxygenation system to improve water quality in Lake Bard, California

Cited by 15 publications

References 21 publications

Accelerated sediment phosphorus release in Lake Erie's central basin during seasonal anoxia

Accelerated sediment phosphorus release in Lake Erie's central basin during seasonal anoxia

Continuous In Situ Nutrient Analyzers Pinpoint the Onset and Rate of Internal P Loading under Anoxia in Lake Erie’s Central Basin

Increased sediment oxygen flux in lakes and reservoirs: The impact of hypolimnetic oxygenation

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