Hydraulic Model Study for Boston Outfall. II: Environmental Performance
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VIEW THE ORIGINAL ARTICLEPublication: Journal of Hydraulic Engineering
Volume 119, Issue 9
Abstract
Hydraulic model tests were done on the Boston Harbor outfall diffuser with the number of risers and their spacing maintained constant at their final design values. It was found that eight ports per riser resulted in higher dilutions than 12, because with 12 ports the plumes merged and collapsed to a single rising column. Extended duration tests showed that the waste field was stable, that its thickness increased very slowly with time, and that dilution decreased very slowly with time. The flux‐average dilution was estimated from the movement of dye streaks to be only 1.1–1.2 times higher than the minimum dilution, a much smaller ratio than usually assumed. The mathematical model ULINE was found to be generally conservative in predicting dilution. Better predictions were obtained with a new mathematical model RSB, which well simulated the observed waste‐field characteristics for the final design. The effect of varying the number of risers was not so well predicted by RSB, however, due to the very large effective port spacing for this diffuser. Thus, hydraulic model tests are still needed for atypical diffuser designs, such as encountered here.
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Published In
Journal of Hydraulic Engineering
Volume 119 • Issue 9 • September 1993
Pages: 988 - 1002
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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