Shore line effects on mixing of tee diffuser.

In this technical note, a semi-empirical theory was developed and experimentally calibrated to account for the reduced dilution of a tee diffuser in shallow, quiescent water near a parallel shore line. The theory suggests that to obtain dilution equal to 90% or better of that predicted for an unconfined water body, the distance between the diffuser and the shore must be at least 80% of the diffuser length. To obtain 70% of the dilution predicted for infinite water, the separation distance may be as little as 35% of the diffuser length. The empirical constant of the analysis is estimated using laboratory experiments. This note is based on a special projects assignment associated with an M.I.T. undergraduate fluid mechanics course in civil engineering. (A.B.)