Rate and pathways of phosphorus assimilation in the Nepean River at Camden, New South Wales

Simmons, B. L.; Cheng, Dongsheng

doi:10.1016/0043-1354(85)90344-6

Cited by 15 publications

(12 citation statements)

References 9 publications

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“…Steady state (or the equivalent, long-term averaging) is presumed. If there are no significant additions of water or phosphorus from other sources, the simple first-order equations shown here have proven useful (Keup, 1968;Simmons and Cheng, 1985;Fisher, 1977;Mulholland, et al, 1990). Extensions may be easily made to account for other inputs, but not for high-frequency dynamics.…”

Section: Field Methods: Streamsmentioning

confidence: 99%

“…Similarly, Newbold et al (1983) positively related P retention and particulate organic matter in the stream. Phosphorus uptake in Nepean River, New South Wales, Australia, was attributed primarily to assimilation in the littoral zone, while soluble P loss by inert particle uptake and chemical precipitation did not appear to be significant (Simmons and Cheng, 1985).…”

Section: B Streamsmentioning

confidence: 99%

“…This first-order relationship was used to calculate P assimilation in streams as a function of distance from the source (Fisher, 1977;Keup, 1968;Mulholland et al, 1990;Simmons and Cheng, 1985). The limitations of Eq.…”

Section: Field Methods: Streamsmentioning

confidence: 99%

“…The above equation was modified by Simmons and Cheng (1985) to account for the variation due to dilution and phosphorus load (concentration and flow) as described by: Newbold et al (1981) Otter Creek (Lake Okeechobee, FL) 0.6 × 10 -4 to 2.9 × 10 -4 Everglades Marsh (WCA-2a)…”

Section: Field Methods: Streamsmentioning

confidence: 99%

“…Often, soluble P is converted by phytoplankton into particulate P and is trapped within the littoral zone vegetation (Simmons and Cheng, 1985). The sediments deposited on the soil surface can be organic or mineral depending on the watershed and the hydrologic conditions.…”

Section: B Sedimentation and Entrainmentmentioning

confidence: 99%

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Phosphorus Retention in Streams and Wetlands: A Review

Reddy

Kadlec

Flaig

et al. 1999

Critical Reviews in Environmental Science and Technology

842

605

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Copyright© 1999, CRC Press LLC -Files may be downloaded for personal use only. Reproduction of this material without the consent of the publisher is prohibited. 83Critical Reviews in Environmental Science and Technology, 29(1):83--146 (1999) ABSTRACT : Wetlands and streams buffer the interactions among uplands and adjacent aquatic systems. Phosphorus (P) is often the key nutrient found to be limiting in both estuarine and freshwater ecosystems. As such, the ability of wetlands and streams to retain P is key to determining downstream water quality. This article reviews the processes and factors regulating P retention in streams and wetlands and evaluates selected methodologies used to estimate P retention in these systems. Phosphorus retention mechanisms reviewed include uptake and release by vegetation, periphyton and microorganisms; sorption and exchange reactions with soils and sediments; chemical precipitation in the water column; and sedimentation and entrainment. These mechanisms exemplify the combined biological, physical, and chemical nature of P retention in wetlands and streams. Methodologies used to estimate P retention include empirical input-output analysis and mass balances, and process kinetics applied at various scales, including micro-and mesocosms to full-scale systems. Although complex numerical models are available to estimate P retention and transport, a simple understanding of P retention at the process level is important, but the overall picture provided by mass balance and kinetic evaluations are often more useful in estimating long-term P retention.

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Section: Field Methods: Streamsmentioning

confidence: 99%

Section: B Streamsmentioning

confidence: 99%

Section: Field Methods: Streamsmentioning

confidence: 99%

Section: Field Methods: Streamsmentioning

confidence: 99%

Section: B Sedimentation and Entrainmentmentioning

confidence: 99%

See 3 more Smart Citations

Phosphorus Retention in Streams and Wetlands: A Review

Reddy

Kadlec

Flaig

et al. 1999

Critical Reviews in Environmental Science and Technology

842

605

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Effect of Model Structure on the Accuracy and Uncertainty of Results From Water Quality Models

Perk

1997

Hydrological Processes

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Eight one-dimensional steady-state models with dierent complexity, which describe the phosphate concentration as a function of the distance along a river, were examined with respect to accuracy and uncertainty of the model results and identi®ability of the model parameters by means of combined calibration and sensitivity analysis using Monte Carlo simulations. In addition, the models were evaluated by the Akaike information criterion (AIC). All eight models were calibrated on the same data set from the Biebrza River, Poland. Although the accuracy increases with model complexity, the percentage of explained variance is not signi®cantly improved in comparison with the model that describes the phosphate concentration by means of three parameters. This model also yields the minimum value of the AIC and the parameters could be well identi®ed. Identi®cation of the model parameters becomes poorer with increasing model complexity; in other words the parameters become increasingly correlated. This scarcely aects the uncertainty of the model results if correlation is taken into account. If correlation is not taken into account, the uncertainty of model results increases with model complexity.

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Calibration and identifiability analysis of a water quality model to evaluate the contribution of different processes to the short-term dynamics of suspended sediment and dissolved nutrients in the surface water of a rural catchment

Perk

1998

Hydrol. Process.

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Abstract:A method that combines calibration and identi®ability analysis of a dynamic water quality model to evaluate the relative importance of various processes aecting the dynamic aspects of water composition is illustrated by a study of the response of suspended sediment and dissolved nutrients to a¯ood hydrograph in a rural catchment area in the Netherlands. Since the water quality model simulates the observed concentrations of suspended sediment and dissolved nutrients reasonably well, the most important processes during the observed¯ood hydrograph could be determined. These were erosion, exchange between dissolved phase and bed sediments and denitri®cation. It is concluded that the method is very useful for identifying the most signi®cant model parameters and processes that are essential for water quality modelling. #

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Rate and pathways of phosphorus assimilation in the Nepean River at Camden, New South Wales

Cited by 15 publications

References 9 publications

Phosphorus Retention in Streams and Wetlands: A Review

Phosphorus Retention in Streams and Wetlands: A Review

Effect of Model Structure on the Accuracy and Uncertainty of Results From Water Quality Models

Calibration and identifiability analysis of a water quality model to evaluate the contribution of different processes to the short-term dynamics of suspended sediment and dissolved nutrients in the surface water of a rural catchment

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