Societal Benefits of the Real-Time Coastal Observation Network (ReCON): Implications for Municipal Drinking Water Quality

Ruberg, Steven A.; Guasp, Edwin; Hawley, Nathan; Muzzi, Ronald W.; Brandt, Stephen B.; Vanderploeg, Henry A.; Lane, John; Miller, Terry; Constant, Stephen A.

doi:10.4031/002533208786842471

Cited by 16 publications

(15 citation statements)

References 8 publications

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“…Simulated hypoxia north of Pelee Island in our model requires more rigorous confirmation. Previous reports of upwelling events affecting water intakes were limited to isolated incidents (Ruberg et al, ), but we report multiple events per season. Occurrences of hypoxia earlier than previously reported (July) and in shallower locations are in contrast to estimates of hypoxic area based mainly on deep‐water observations (Zhou et al, ).…”

Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Rapid changes in bottom DO occur in coastal areas, caused by upwelling or internal waves that result in shoreward advection of hypoxic bottom water. These dynamics can alter fish distribution, cause fish kills, or cause rapid changes in water quality at drinking water plant intakes (Kraus et al, 2015;Rao et al, 2014;Ruberg et al, 2008). Spatial patterns of hypoxia, and episodes of hypoxia in nearshore areas where drinking water intakes are located, are not well characterized owing to limited observations of bottom dissolved oxygen (DO) and dynamic movement of the hypoxic boundary in nearshore areas.…”

Section: Introductionmentioning

confidence: 99%

“…Wind rose plot showing NE wind in days preceding upwelling events along the Ohio coast described byRuberg et al (2008) and shown inFigures 12 and 13.…”

mentioning

confidence: 99%

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Coastal Upwelling Influences Hypoxia Spatial Patterns and Nearshore Dynamics in Lake Erie

et al. 2019

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Hypoxia, defined as dissolved oxygen (DO) < 2 mg/L, in the central basin of Lake Erie has been studied since the mid‐1900s. Even so, spatial patterns of hypoxia, and episodic hypoxia in nearshore areas where drinking water plant intakes are located, are not well characterized owing to limited observations and short‐term dynamics. We evaluated a physically based, DO model with respect to patterns of hypoxia observed in Lake Erie. The DO model used assigned rates of sediment and water column oxygen demand that were temperature dependent but otherwise spatially and temporally uniform. The DO model was linked to National Oceanic and Atmospheric Administration's (NOAA) Lake Erie Operational Forecasting System hydrodynamic model, an application of the Finite Volume Community Ocean Model (FVCOM). Model temperature and DO were compared with observations from ship‐based studies, real‐time sensor networks and an array of moored sensors that we deployed in 2017. In years with dominant southwesterly winds, persistent downwelling occurred along the south shore, which resulted in a thinner thermocline and earlier initiation of hypoxia along the south shore than the north. Occasional northeast winds temporarily reversed this pattern, causing upwelling along the south shore that brought hypoxic water to nearshore locations and water intakes. The DO model reproduced observed spatial and temporal patterns of hypoxia and revealed locations subject to episodes of hypoxia, including nearshore Ohio, north of Pelee Island, and near the Bass Islands. Model skill was limited in some respects, highlighting the importance of accurate simulation of the thermal structure and spatial patterns of oxygen demand rates.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Wind rose plot showing NE wind in days preceding upwelling events along the Ohio coast described byRuberg et al (2008) and shown inFigures 12 and 13.…”

mentioning

confidence: 99%

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Coastal Upwelling Influences Hypoxia Spatial Patterns and Nearshore Dynamics in Lake Erie

et al. 2019

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Temporal and spatial dynamics of large lake hypoxia: Integrating statistical and three‐dimensional dynamic models to enhance lake management criteria

Bocaniov

Scavia

2016

Water Resources Research

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Hypoxia or low bottom water dissolved oxygen (DO) is a world‐wide problem of management concern requiring an understanding and ability to monitor and predict its spatial and temporal dynamics. However, this is often made difficult in large lakes and coastal oceans because of limited spatial and temporal coverage of field observations. We used a calibrated and validated three‐dimensional ecological model of Lake Erie to extend a statistical relationship between hypoxic extent and bottom water DO concentrations to explore implications of the broader temporal and spatial development and dissipation of hypoxia. We provide the first numerical demonstration that hypoxia initiates in the nearshore, not the deep portion of the basin, and that the threshold used to define hypoxia matters in both spatial and temporal dynamics and in its sensitivity to climate. We show that existing monitoring programs likely underestimate both maximum hypoxic extent and the importance of low oxygen in the nearshore, discuss implications for ecosystem and drinking water protection, and recommend how these results could be used to efficiently and economically extend monitoring programs.

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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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Societal Benefits of the Real-Time Coastal Observation Network (ReCON): Implications for Municipal Drinking Water Quality

Abstract: Recently, the Marine Technology Society addressed marine technology applications that provide environmental, economic, and societal benefit (Kohanowich, 2007). The ReCON project, real-time networking technology developed for marine coastal observations (Ruberg, Muzzi et al.,

Cited by 16 publications

References 8 publications

Coastal Upwelling Influences Hypoxia Spatial Patterns and Nearshore Dynamics in Lake Erie

Coastal Upwelling Influences Hypoxia Spatial Patterns and Nearshore Dynamics in Lake Erie

Temporal and spatial dynamics of large lake hypoxia: Integrating statistical and three‐dimensional dynamic models to enhance lake management criteria

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

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