Prediction of Near Field Plume Characteristics Using Far Field Circulation Model
Publication: Journal of Hydraulic Engineering
Volume 125, Issue 3
Abstract
3-D numerical models are being used more commonly to predict changes in coastal water quality associated with point discharges such as sewage outfalls. Because these “far field” models use grid sizes which are orders of magnitude larger than the scale of near field entrainment processes, it is of interest to compare their predictive capability with that of initial mixing models and to identify ways in which the two model types can be coupled. Comparisons between the 3-D circulation model ECOMsi and the Environmental Protection Agency's mixing model RSB suggest that the former does a reasonable job predicting plume trap height and volumetric dilution but often overpredicts plume width. Results are sensitive to source representation and parameterization of horizontal and vertical diffusion. The success results from the fact that initial dilution is governed in part by gravitational exchange flow (a large-scale phenomenon that can be resolved in a far field model) in addition to plume entrainment (which is clearly subgrid scale), as well as the self-regulating relationship between plume trap height and initial dilution. Overprediction of plume width is attributed to numerical diffusive effects. Several procedures for improving predictions by coupling near and far field models are explored, ranging from the use of the near field model to dynamically adjust far field mixing parameters, so that the far field model simulates the correct trap height, to simply using the near field model to assign source location and dimension for the far field.
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References
1.
Bell, R. G., Munro, D., and Powell, P. ( 1992). “Modeling microbial concentrations from multiple outfalls using time-varying inputs and decay rates.” Water Sci. Technol. 25(9), 181–188.
2.
Blumberg, A. F., and Mellor, G. L. ( 1987). “A description of a three-dimensional coastal ocean circulation model.” Three dimensional coastal ocean models, Vol. 4, N. Heaps, ed., American Geophysicists Union, Washington, D.C., 1–16.
3.
Blumberg, A. F. ( 1995). “Modeling transport and fate of pathogenic organisms in Mamala Bay.” Rep. prepared for the Mamala Bay Study Commission, HydroQual, Inc., Mahwah, N.J.
4.
Blumberg, A. F., Ji, Z. G., and Ziegler, C. K. (1996). “Modeling outfall plume behavior using a far field circulation model.”J. Hydr. Engrg., ASCE, 122(11), 610–616.
5.
Chen, C. J., and Rodi, W. ( 1980). Vertical turbulent buoyant jets—review of experimental data . Pergamon Press, Tarrytown, N.Y.
6.
Davies-Colley, R. J., Bell, R. G., and Donnision, A. M. ( 1994). “Sunlight inactivation of Enterococci and fecal coliforms in sewage effluent diluted in seawater.” Appl. and Envir. Microbiology, 60(6), 2049–2058.
7.
Dortch, M. S. ( 1990). “Three dimensional Lagrangian residual transport computed from an intratidal hydrodynamic model.” Tech. Rep. EL-90-11, Envir. Lab., Dept. of the Army, Waterways Experiment Station, Vicksburg, Miss.
8.
Fischer, H. B., List, E. J., Koh, R. C. Y., Imberger, J., and Brooks, N. H. ( 1979). Mixing in inland and coastal waters . Academic, San Diego.
9.
Galperin, B., Kantha, L. H., Hassid, S., and Rosati, A. ( 1988). “A quasi-equilibrium turbulent energy model for geophysical flows.” J. Atmospheric Sci. 45, 55–62.
10.
Grace, R. A. ( 1978). Marine outfall systems, planning, design and construction . Prentice Hall, Englewood Cliffs, N.J.
11.
HydroQual, Inc. ( 1995). “A water quality model for Massachusetts Bay and Cape Cod Bay—the Bays Eutrophication Model calibration.” Technical Report, Mahwah, N.J.
12.
Jirka, G. H., and Akar, P. J. (1991). “Hydrodynamic classification of submerged multiport diffuser discharges.”J. Hydr. Engrg., ASCE, 117, 1113–1128.
13.
King, I. P., and George, J. F. ( 1995). “A multidimensional modeling of water quality using the finite-element method.” Proc., 4th Int. Conf. on Estuarine and Coastal Modeling, M. L. Spaulding and R. T. Cheng, eds., ASCE, Reston, Va.
14.
Koh, R. C. Y. (1983). “Wastefield thickness and initial dilution.”J. Hydr. Engrg., ASCE 109, 1232–1242.
15.
Laws, E. A., and Chalup, M. S. ( 1990). “A microalgal growth model.” Limnol. and Oceanography 35(3), 597–608.
16.
Mellor, G. L., and Yamada, T. ( 1982). “Development of a turbulence closure model for geophysical fluid problems.” Rev. of Geophys. and Space Phys. 20, 851–875.
17.
Mullenhoff, W. P., Soldate, A. M., Baumgartner, D. J., Schuldt, M. D., Davis, L. R., and Frick, W. E. ( 1985). “Initial mixing characteristics of municipal ocean discharges.” Rep. No. EPA-600/3-85-073a, Environmental Protection Agency, Washington, D.C.
18.
Roberts, P. J. W., Snyder, W. H., and Baumgartner, D. J., (1989a). b,c). “Ocean outfalls. I: Submerged wastefield formation. II: Spatial evolution of submerged wastefield. III: Effect of diffuser design on submerged wastefield.”J. Hydr. Engrg., ASCE, 115, 1–70.
19.
Sheng, Y. P. ( 1986). “A three-dimensional numerical model of coastal and estuarine circulation and transport in generalized curvilinear grids.” Tech. Rep. No. 587, Aeronautical Research Associates of Princeton, Inc., Princeton, N.J.
20.
Wallace, R. B., and Wright, S. J. (1984). “Spreading layer of two-dimensional buoyant jet.”J. Hydr. Engrg., ASCE, 110, 813–828.
21.
Zhang, X.-Y., Adams, E. E., Blumberg, A. F., Ji, Z. G., and Ziegler, C. K. ( 1994). “Near field behavior of a far field circulation model.” Hydraulic engineering 1994, ASCE, Reston, Va., 155–159.
22.
Zhang, X.-Y. ( 1995). “Ocean outfall modeling—interfacing near and far field models with particle tracking method.” PhD thesis, Dept. Civil and Envir. Engrg., Massachusetts Institute of Technology, Cambridge, Mass.
Information & Authors
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Published In
Journal of Hydraulic Engineering
Volume 125 • Issue 3 • March 1999
Pages: 233 - 241
History
Received: Mar 11, 1996
Published online: Mar 1, 1999
Published in print: Mar 1999
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