Total Phosphorus Model for the Great Lakes

1977 ◽  
Vol 103 (2) ◽  
pp. 147-161
Author(s):  
Steven C. Chapra
Keyword(s):  
Great Lakes ◽  
Total Phosphorus

Great Lakes total phosphorus revisited: 2. Mass balance modeling

2012 ◽  
Vol 38 (4) ◽  
pp. 741-754 ◽  
Author(s):  
Steven C. Chapra ◽  
David M. Dolan
Keyword(s):  
Great Lakes ◽  
Mass Balance ◽  
Total Phosphorus

Trends in Total Phosphorus in Canadian Near–Shore Waters of the Laurentian Great Lakes: 1976–1999

2001 ◽  
Vol 27 (4) ◽  
pp. 402-422 ◽  
Author(s):  
Kenneth H. Nicholls ◽  
Gordon J. Hopkins ◽  
Susan J. Standke ◽  
Lynda Nakamoto
Keyword(s):  
Great Lakes ◽  
Total Phosphorus ◽  
Laurentian Great Lakes ◽  
Near Shore

Great Lakes Total Phosphorus Model: Post Audit and Regionalized Sensitivity Analysis

1991 ◽  
Vol 17 (1) ◽  
pp. 3-17 ◽  
Author(s):  
Barry M. Lesht ◽  
Thomas D. Fontaine ◽  
David M. Dolan
Keyword(s):  
Sensitivity Analysis ◽  
Great Lakes ◽  
Total Phosphorus

Phosphorus and Metal Contaminant Transport in Two Southern Ontario Rivers: the Grand River and its Tributary, the Nith River

1996 ◽  
Vol 31 (1) ◽  
pp. 119-152 ◽  
Author(s):  
T. Mayer ◽  
E. Delos Reyes
Keyword(s):  
Heavy Metals ◽  
Water Quality ◽  
Great Lakes ◽  
Total Phosphorus ◽  
Water Samples ◽  
Suspended Solids ◽  
Suspended Sediments ◽  
Southern Ontario ◽  
High Flows ◽  
Grand River

Abstract Water samples and suspended sediments from two southern Ontario rivers, the Grand River and its tributary, the Nith River, were analyzed to investigate the role of suspended sediments in the transport of phosphorus and metals from tributaries. Water samples were analyzed for total suspended solids, total phosphorus, total dissolved phosphorus, chloride and heavy metal concentrations. Suspended sediments were analyzed for forms of phosphorus, total and organic carbon, and heavy metals. Concentrations of total phosphorus and heavy metals in water were elevated during high flows (spring snowmelt and episodes of intensive rain events), which are characterized by high concentrations of suspended solids. On average, about half of the total phosphorus in the water (60 and 54% in the Grand and Nith rivers, respectively) was transported in the particulate form, of which about 20% is in a form that would be potentially available for biological utilization upon depletion of soluble P. Biologically inert apatite-P accounted for 25 and 19% of the total particulate P in suspended sediments from the Grand and Nith rivers, respectively, indicating that between one-fifth and one-quarter of the tributary particulate P flux is of little environmental significance. This form of particulate P showed positive correlation with discharge, indicating increased contribution of this form of P during high flows due to the channel scouring and bank erosion. This finding has important implications for the refinement of P load calculations, since it is during the wet years that P loads to the Great Lakes exceed target loads stipulated by the Great Lakes Water Quality Agreement, mainly because of increased tributary P contributions. Except for apatite-P in suspended sediments from the Grand River, no statistically significant intersite differences were found in water and sediment chemistry, suggesting that there are no important sources or sinks of available phosphorus and metals between the monitored sites. River inputs from sewage treatment plants and urban runoff appear to have little effect on water quality. The lack of significant site differentiation in suspended sediments chemistry also reflects the absence of any significant chemical and/or biological processing of particles in transit and the similarity of sediment sources.

Great Lakes Eutrophication: The Effect of Point Source Control of Total Phosphorus

Science ◽  
1977 ◽  
Vol 196 (4297) ◽  
pp. 1448-1450 ◽  
Author(s):  
S. C. CHAPRA ◽  
A. ROBERTSON
Keyword(s):  
Point Source ◽  
Great Lakes ◽  
Total Phosphorus ◽  
Source Control
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