Potomac estuary

Walker, H.A., Latimer, J.S., and Dettmann, E.H. (2000) Assessing the effects of natural and anthropogenic stressors in the Potomac estuary implications for long-term monitoring. Environ. Monit. Assess. 63, 237-251. 

Other models have been proposed which follow the outlines of the equations already discussed. Equations with parameters that vary as a function of temperature, sunlight, and nutrient concentration have been presented by Davidson and Clymer (9) and simulated by Cole (10). A set of equations which model the population of phytoplankton, zooplankton, and a species of fish in a large lake have been presented by Parker (II). The application of the techniques of phytoplankton modeling to the problem of eutrophication in rivers and estuaries has been proposed by Chen (12). The interrelations between the nitrogen cycle and the phytoplankton population in the Potomac Estuary has been investigated using a feed-forward-feed-back model of the dependent variables, which interact linearly following first order kinetics (13). 

In addition to raising waves on the water surface, winds will set the surface layers of water in motion in the direction of the wind stress or, if the water is sufficiently shallow, set up a circulation pattern extending to the bottom. Pickard and Rodgers (1959) have shown, for example, how an up-estuary wind can set the surface layer of water in the Knight Inlet (B.C.) in motion against the estuarine circulation. Elliott (1978) has demonstrated the importance of wind stress in determining the circulation in the Potomac estuary. To have much influence on estuarine sedimentary processes, however, the wind-driven circulation must penetrate to the bottom, which is likely to happen only in relatively shallow estuaries. In... 

Elliott, A. J. (1978). Observations of the meteorologically induced circulation in the Potomac estuary. Estuarine Coastal Mar. Sci. 6, 285-299. 

Callender, E., and Hammond, D.E. (1982) Nutrient exchange across the sediment-water interface in the Potomac River estuary. Estuar. Coastal Shelf Sci. 15, 395—413. 

Simon, N.S., and Kennedy, M.M. (1987) The distribution of nitrogen species and adsorption of ammonium in sediments from the tidal Potomac River and Estuary. Estuar. Coastal Shelf Sci. 25, 11-26. 

Figure 18.10 Scatter plot of average annual TN mass versus average annualTN loads for a portion of Chesapeake Bay and a selection of Chesapeake Bay tributary rivers. All concentration data were from sampling stations located in the mesohaline regions of the Bay and tributary rivers. Inset shows annual TN concentrations versusTN loads to the Potomac River estuary for an 8 year period. All data were from the Chesapeake Bay Water Quality Monitoring Program (2004).

Boicourt, W. C. (1983). The Detection and Analysis of the Lateral Circulation in the Potomac River Estuary. Maryland Power Plant Siting Research Program Publication No. 66, Annapohs, MD, 209pp. 

Humin isolates from sediments of the Mew York Bight and Potomac River estuary have spectra that are notably different in that aromatic carbons are the dominant components. The spectra resemble that of humin isolated in the same manner from an aerobic soil from southern Georgia (Figure 5). However, unlike the humin from soil which shows a significant peak for carboxyl carbon (175 ppm), spectra of humin from the New York Bight and the Potomac River do not display a discreet peak at 175 ppm and appear to be depleted of carboxy 1/amide groups. Elemental data for these humins (19) are consistent with the NMR results. Atomic H/C ratios of less than 0.8 are not typical of humic material but more like those of highly aromatic coal or coal-like products. The NMR spectra also resemble... 

Jaworski, N. A., Groffman, P. M., Keller, A. A. Prager, J. C. (1992). A watershed nitrogen and phosphorus balance the Upper Potomac River basin. Estuaries, 15, 83-95. 

Simon, N. S. 1988. Nitrogen cycling between sediment and the shallow-water column in the transition zone of the Potomac River and estuary. I. Nitrate and ammonium flux. Estuar. Coast. Shelf Sci. 26 483-497. 

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