Hydraulic Model Study for Boston Outfall. I: Riser Configuration
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Volume 119, Issue 9
Abstract
The hydraulic model study to determine the diffuser design for the Boston Wastewater Outfall is described in two papers. The outfall is tunneled with a diffuser consisting of multiport risers, and in this paper the tests leading to the final choice of the riser configuration are described. The study was done in a large density‐stratified towing tank. It was found that, for zero current speed with a deep thermocline, a thick, laterally homogeneous, submerged waste field was formed. For widely spaced risers, additional mixing in the plumes following collapse caused the minimum dilution to be higher than predicted by simple plume formulae. As the number of risers is decreased below about 50, the dilution decreases fairly rapidly, but increasing the number above about 50 caused the dilution to increase only slowly. The number of risers was chosen to be 55. This resulted in a savings of about $38,000,000 in construction costs compared to the preliminary design.
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References
1.
Adams, E. E., Sahoo, C., and Liro, C. (1990). “Hydraulic model study of seawater purging for the Boston wastewater outfall.” Rept. no. 329, R. M. Parsons Lab. Department of Civil Engineering, MIT, Cambridge, Mass.
2.
Brooks, N. H. (1980). “Synthesis of stratified flow phenomena for design of ocean outfalls.” 2nd Intl. Symp. on Strat. Flows, IAHR, Delft, The Netherlands, 809–831.
3.
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, San Diego, Calif.
4.
Isaacson, M. S., Koh, R. C. Y., and Brooks, N. H. (1978). “Sectional hydraulic modeling study of plume behavior: San Francisco southwest ocean outfall project.” Tech. memo. 78‐2, W. M. Keck Lab. of Hydr. and Water Resour., California Inst. of Technol., Pasadena, Calif.
5.
Isaacson, M. S., Koh, R. C. Y., and Brooks, N. H. (1983). “Plume dilution for diffusers with multiport risers.” J. Hydr. Engrg., ASCE, 109(2), 199–220.
6.
Liseth, P. (1976). “Wastewater disposal by submerged manifolds.” J. Hydraulics Div., ASCE, 102(1), 1–14.
7.
Marsh, G. L. (1989). “Data report, Boston wastewater outfall project.” FMF internal rep., U.S. Environmental Protection Agency, Washington, D.C.
8.
Secondary treatment facilities plan, volume V, appendix A, physical oceanographic investigations. (1988). Massachusetts Water Resour. Authority, Boston, Mass.
9.
Roberts, P. J. W. (1979). “Line plume and ocean outfall dispersion.” J. Hydraulics Div., ASCE, 105(4), 313–330.
10.
Roberts, P. J. W. (1989). “Dilution hydraulic model study of the Boston wastewater outfall.” Rep. no. SCEGIT 89‐101, School of Civil Engineering, Georgia Inst. of Technol., Atlanta, Ga.
11.
Roberts, P. J. W., Snyder, W. H., and Baumgartner, D. J. (1989a). “Ocean outfalls. I: Submerged wastefield formation.” J. Hydr. Engrg., ASCE, 115(1), 1–25.
12.
Roberts, P. J. W., Snyder, W. H., and Baumgartner, D. J. (1989b). “Ocean outfalls. II: Spatial evolution of submerged wastefield.” J. Hydr. Engrg., ASCE, 115(1), 26–48.
13.
Roberts, P. J. W., Snyder, W. H., and Baumgartner, D. J. (1989c). “Ocean outfalls. III: Effect of diffuser design on submerged wastefield.” J. Hydr. Engrg., ASCE, 115(1), 49–70.
14.
Snyder, W. H. (1981). “Guideline for fluid modeling of atmospheric diffusion.” Rep. no. EPA‐600/8/81/009, U.S. Environmental Protection Agency, Research Triangle Park, N.C.
15.
Wong, D. R., and Wright, S. J. (1988). “Submerged turbulent buoyant jets in stagnant linearly stratified fluids.” J. Hydr. Res., 26(2), 199–223.
16.
Wright, S. J. (1984). “Buoyant jets in density‐stratified crossflow.” J. Hydr. Engrg., ASCE, 110(5), 643–656.
17.
Wright, S. J., Roberts, P. J. W., Zhongmin, Y., and Bradley, N. E. (1990). “Surface dilution of round submerged buoyant jets.” J. Hydr. Res., 29(1), 67–89.
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Published In
Journal of Hydraulic Engineering
Volume 119 • Issue 9 • September 1993
Pages: 970 - 987
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Jul 8, 1992
Published online: Sep 1, 1993
Published in print: Sep 1993
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