Tidal variability in the water quality of an urbanized estuary
Tóm tắt
Tide and water quality data were collected concurrently in the Hackensack River estuary (HRE), a tidal tributary of the New York-new Jersey Harbor estuary. Harmonic analyses of tidal elevation data indicate that HRE tides are predominantly semidiurnal, though modulated by diurnal and fortnightly components. Nearly uniform tidal ranges (averaging approximately 1.6 m) were observed at three stations within the HRE. Periodogram estimates reveal significant tidal variability for the water quality parameter NH4−N under dry-weather conditions. Lag correlation analyses associate NH4−N concentration variations with water level fluctuations. Longitudinal profile plots for NH4−N reveal a consistent pattern of tidal translations, with peak concentrations oscillating about a major wastewater discharger. These analyses suggest that the distribution of NH4−N concentrations in the HRE is controlled primarily by major point source loadings and horizontal advection. A simplified, one-dimensional model is used to describe this distribution. Effects of tidal variability in masking water quality status and waak trends are also analyzed. These analyses highlight the potential importance of short-term water quality variability in tidal estuaries where concentration gradients are large.
Tài liệu tham khảo
Brosnan, T. M. andM. L. O’Shea. 1996. Long-term improvements in water quality due to sewage abatement in the lower Hudson River.Estuaries 19:890–900.
Cloern, J. E., T. M. Powell, andL. M. Huzzey. 1989. Spatial and temporal variability in South San Francisco Bay (USA). II. Temporal changes in salinity, suspended sediments, and phytoplankton biomass and productivity over tidal time scales.Estuarine, Coastal and Shelf Science 28:599–613.
Geyer, W. R. andR. P. Signell. 1992. A reassesment of the role of tidal dispersion in estuaries and bays.Estuaries 15:97–108.
Goodrich, D. M. 1988. On meteorologically induced flushing in three U.S. East Coast estuaries.Estuarine, Coastal and Shelf Science 26:116–121.
Harleman, R. F. 1971. One-dimensional models. Estuarine Modeling: An Assessment. Tracor Inc. and U.S. Environmental Protection Agency, Water Quality Office, Washington D.C., Project No. 16070DZV.
Hubertz, E. D. andL. B. Cahoon. 1999. Short-term variability of water quality parameters in two shallow estuaries of North Carolina.Estuaries 22:814–823.
Keller, A. A., K. R. Hinga, andC. A. Oviatt. 1990. New York-New Jersey Harbor estuary program module 4: Nutrients and organic enrichment. Marine Ecosystems Research Laboratory, Graduate School of Oceanography, University of Rhode Island. Narragansett, Rhode Island.
Kish, L. 1995. Survey Sampling. John Wiley and Sons, Inc., New York.
Konsevick, E. 1999. Hackensack River Water Quality (Draft). Hackensack Meadowlands Development Commission Environmental Operations Research Laboratory, Lyndhurst, New Jersey.
Najarian Associates. 1990. Impact analysis of sewage treatment plant discharges on the water quality of the lower Hackensack River. Report for Bergen County Utilities Authority, Little Ferry, New Jersey.
Sanderson, P. G. andD. M. Taylor. 2003. Short-term water quality variability in two tropical estuaries, Central Sumatra.Estuaries 26:156–165.
Sharples, J. andJ. H. Simpson. 1993. Periodic frontogenesis in a region of freshwater influence.Estuaries 16:74–82.
Simpson, J. H., J. Brown, J. Matthews, andG. Allen. 1990. Tidal straining, density currents, and stirring in the control of estuarine stratification.Estuaries 13:125–132.
Squibb, K. S., J. M. O’Connor, andT. J. Kneip. 1991. New York/New Jersey harbor estuary program module 3.1: Toxics characterization. Institute of Environmental Medicine, New York University Medical Center, Tuxedo, New York.
Uncles, R. J. 2002. Estuarine physical processes research: Some recent studies and progress.Estuarine, Coastal and Shelf Science 55:829–856.
U.S. Environmental Protection Agency (U.S. EPA). 1983. Methods for Chemical Analysis of Water and Wastes. EPA 600-3-83-020. Cincinnati, Ohio.