The importance of transport processes and spatial gradients on in situ estimates of lake metabolism

Antenucci, Jason P.; Tan, Kok Meng; Eikaas, Hans S.; Imberger, J.

doi:10.1007/s10750-012-1212-z

Cited by 20 publications

(26 citation statements)

References 35 publications

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“…Dimensionless relationships that include Sh demonstrate the degree to which water motion and organism size affect mass transfer, and ultimately organism metabolic rate (Patterson, 1992). An example application of Pe is its use in describing lentic mass transport associated with lake metabolism (Antenucci et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Glossossoma nigrior (Trichoptera: Glossosomatidae) respiration in moving fluid

Morris

Hondzo

2013

Journal of Experimental Biology

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SUMMARYLaboratory measurements of dissolved oxygen (DO) uptake by Glossosoma nigrior Banks were conducted in a sealed, recirculating flume under variable fluid flow velocities. Measurements were performed in similar water temperatures, DO concentrations and fluid flow velocities to field conditions in the stream where the larvae were obtained. Total oxygen uptake by both cased larvae and corresponding cases without larvae were quantified. An increased fluid flow velocity corresponded to an increased larval DO uptake rate. Oxygen uptake by the larval cases alone was not as sensitive to changes in the Peclet (Pe) number, the dimensionless ratio of advective to diffusive DO transport, as uptake by larvae themselves. The flux of DO to larvae and their cases was up to seven times larger in a moving fluid in comparison to non-moving fluid conditions in the proximity of larvae for 087, larvae typically remained in their cases. This indicates that oxygen delivery to the larvae at low Pe is insufficient to satisfy the respiratory demands of cased larvae.

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Section: Discussionmentioning

confidence: 99%

Glossossoma nigrior (Trichoptera: Glossosomatidae) respiration in moving fluid

Morris

Hondzo

2013

Journal of Experimental Biology

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“…The preservation of water quality standards in Marina Reservoir is challenged by the considerable load of nutrients (mostly phosphates and nitrates), which, combined with high water temperature and light intensity, often leads to in‐reservoir eutrophic conditions [ Antenucci et al ., ]. Besides, the recent formation of the impoundment from a former estuary makes high salt concentrations another important issue.…”

Section: Study Sitementioning

confidence: 99%

“…Besides, the recent formation of the impoundment from a former estuary makes high salt concentrations another important issue. Since the permanent closure of the barrage in April 2009, salinity levels have dropped to typical fresh water standards in many areas of the reservoir [ Antenucci et al ., ]. However, residual sources of saline water persist in the form of groundwater seepage driven by the water level gradient between sea and reservoir during high tide events.…”

Section: Study Sitementioning

confidence: 99%

High‐Performance Integrated Control of water quality and quantity in urban water reservoirs

Galelli

Castelletti

Goedbloed

2015

Water Resources Research

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This paper contributes a novel High‐Performance Integrated Control framework to support the real‐time operation of urban water supply storages affected by water quality problems. We use a 3‐D, high‐fidelity simulation model to predict the main water quality dynamics and inform a real‐time controller based on Model Predictive Control. The integration of the simulation model into the control scheme is performed by a model reduction process that identifies a low‐order, dynamic emulator running 4 orders of magnitude faster. The model reduction, which relies on a semiautomatic procedural approach integrating time series clustering and variable selection algorithms, generates a compact and physically meaningful emulator that can be coupled with the controller. The framework is used to design the hourly operation of Marina Reservoir, a 3.2 Mm3 storm‐water‐fed reservoir located in the center of Singapore, operated for drinking water supply and flood control. Because of its recent formation from a former estuary, the reservoir suffers from high salinity levels, whose behavior is modeled with Delft3D‐FLOW. Results show that our control framework reduces the minimum salinity levels by nearly 40% and cuts the average annual deficit of drinking water supply by about 2 times the active storage of the reservoir (about 4% of the total annual demand).

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“…Uncertainties that showed up in modeling were most often explained by neglected physical processes, primarily vertical and horizontal transport (Hanson et al ; Staehr et al a ; Solomon et al ; Rose et al ). Indeed, a significant effect of transport on single point DO measurements has repeatedly been demonstrated (Lauster et al ; Sadro et al ; Staehr et al b ; Antenucci et al ; McNair et al ).…”

mentioning

confidence: 92%

Coupled simulation of high‐frequency dynamics of dissolved oxygen and chlorophyll widens the scope of lake metabolism studies

Istvánovics

Honti

2017

Limnology & Oceanography

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High frequency time series of dissolved oxygen (DO), delayed chlorophyll fluorescence (Chl) and relevant background variables were recorded on nearly 900 d during 7 yr in large, shallow, meso-eutrophic Lake Balaton (Hungary). Novel models were developed for coupled simulation of diel dynamics of DO and Chl using sequential learning and uncertainty assessment in a Bayesian framework. Despite the generally good model fit for both variables, the uncertainty of the metabolic estimates was high, due primarily to the identification problem of individual metabolic processes. Deviations between observed and simulated DO concentrations suggested that neglect of transient stratification might be responsible for the bulk of the systematic model errors. Net ecosystem production (NEP) was uncertain. Unless air-water oxygen exchange can be estimated from direct measurements, the free-water DO method cannot reliably estimate NEP. Gross primary production (GPP) could satisfactorily be hindcasted assuming non-linear multiplicative dependence on Chl, water temperature and light. Hindcast of community respiration (CR) was less successful, possibly due to the impact of local benthic respiration. Results suggested a major shift in lake metabolism at about 168C. Below and above this temperature, 70% and 90% of net primary production could be utilized by heterotrophs within a day, respectively. Indirect evidence suggested that biomass-specific net primary production was determined by phosphorus. The large difference between reproductive rates and net growth rates estimated from GPP and Chl and from daily change in Chl, respectively indicated that loss rates of phytoplankton were as important determinants of algal dynamics as reproductive rates.

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The importance of transport processes and spatial gradients on in situ estimates of lake metabolism

Cited by 20 publications

References 35 publications

Glossossoma nigrior (Trichoptera: Glossosomatidae) respiration in moving fluid

Glossossoma nigrior (Trichoptera: Glossosomatidae) respiration in moving fluid

High‐Performance Integrated Control of water quality and quantity in urban water reservoirs

Coupled simulation of high‐frequency dynamics of dissolved oxygen and chlorophyll widens the scope of lake metabolism studies

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