Modeling Mamala Bay Outfall Plumes. I: Near Field
Publication: Journal of Hydraulic Engineering
Volume 125, Issue 6
Abstract
The near-field behavior of the Sand Island, Hawaii, ocean outfall plume was modeled. The model, a modified version of the Environmental Protection Agency Roberts-Snyder-Baumgartner model, used as input data simultaneous measurements through the water column of currents obtained from Acoustic Doppler Current Profilers and density profiles obtained from thermistor strings. More than 20,000 simulations were run for a modeling period of almost one year, and frequency distributions of plume characteristics were obtained. The currents and density stratification change widely and rapidly, resulting in extreme variability in plume behavior. Rise height was predicted to vary from deeply submerged to surfacing, and near-field dilution was predicted to vary from around 100 to several thousands within a few hours. The length of the near field, or hydrodynamic mixing zone, also varies considerably, so that a fixed regulatory mixing zone may sometimes encompass all of the near field and some of the far field and sometimes only part of the near field. The combination of oceanographic data with suitable mathematical models represents a significant improvement in our ability to predict the statistical variability of ocean outfall plume behavior.
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References
1.
Baumgartner, D. J., Frick, W. E., and Roberts, P. J. W. ( 1994). “Dilution models for effluent discharges,” 3rd Ed., Rep. No. EPA/600/R-94/086, Office of Research and Development, U.S. Environmental Protection Agency, Washington, D.C.
2.
Blumberg, A. F., and Connolly, J. P. ( 1996). “Modeling fate and transport of pathogenic organisms in Mamala Bay.” Rep. MB-5, Mamala Bay Study Commission, Honolulu.
3.
Colwell, R. R., Orlob, G. T., and Schubel, J. R. ( 1996). “Mamala Bay study management.” Rep. MB-1, Mamala Bay Study Commission, Honolulu.
4.
Fischer, H. B., List, E. J., Koh, R. C. Y., Imberger, J., and Brooks, N. H. ( 1979). Mixing in inland and coastal waters. Academic Press, New York.
5.
Hamilton, P., Singer, J., and Waddell, E. ( 1996). “Ocean current measurements,” Rep. MB-6, Mamala Bay Study Commission, Honolulu.
6.
Jirka, G. H. ( 1994). U.S. EPA Mixing Model Workshop, University of Portland, Portland, Oreg.
7.
Koh, R. C. Y. ( 1977). “Analysis of multiple times series by principal components with application to ocean currents off San Francisco.” Tech. Memo 77-4, W.M. Keck Lab., California Inst. of Technol., Pasadena, Calif.
8.
Millero, F. J., and Poisson, A. ( 1981). “International one-atmosphere equation of state for seawater.” Deep-Sea Res., 28A, 625–629.
9.
Near-field and far-field plume analysis Sand Island outfall system. (1992). Edward K. Noda and Associates, Inc., Honolulu.
10.
Petrenko, A. A., Jones, B. H., and Dickey, T. D. (1998). “Shape and initial dilution of the Sand Island, Hawaii sewage plume.”J. Hydr. Engrg., ASCE, 124(6), 565–571.
11.
Roberts, P. J. W. ( 1996). “Plume modeling.” Rep. MB-4, Mamala Bay Study Commission, Honolulu.
12.
Roberts, P. J. W. (1999). “Modeling Mamala Bay outfall plumes. II: Far field.”J. Hydr. Engrg., ASCE, 125(6), 574–583.
13.
Roberts, P. J. W., and Snyder, W. H. (1993). “Hydraulic model study for the Boston outfall.”J. Hydr. Engrg., ASCE, 119(9), 970–1002.
14.
Roberts, P. J. W., Snyder, W. H., and Baumgartner, D. J. (1989). “Ocean outfalls.”J. Hydr. Engrg., ASCE, 115(1), 1–70.
15.
Roberts, P. J. W., and Wilson, D. ( 1990). “Field and model studies of ocean outfalls.” Proc., 1990 Nat., Conf. on Hydr. Engrg., ASCE, Reston, Va.
16.
U.S. Environmental Protection Agency. ( 1994). “Amended Section 301(h) Technical Support Document.” Rep. No. EPA 842-B-94-007, Office of Wetlands, Oceans and Watersheds, Washington, D.C.
17.
Washburn, L., Jones, B. H., Bratkovich, A., Dickey, T. D., and Chen, M.-S. (1992). “Mixing, dispersion, and resuspension in vicinity of ocean wastewater plume.”J. Hydr. Engrg., ASCE, 118(1), 38–58.
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Published online: Jun 1, 1999
Published in print: Jun 1999
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