JET DIT'T'USION AS RELATED TO OCEAN OUTFALL SYSTEMS

Date thesis is presented ritle_.r_r!!lf {ytlo_\4gJLI'}4lLD_I9_o!J4f I_9gII{L_L!] glgyq Abstract approved This study discusses irnportant aspects of the ocean which should be considered in the design of a sewage outfall systern; con-ditions are restricted to those of the Oregon coastal area. They in-clude predominant currents, upwelling tendencies and ocean bottom c harac te r i sti c s. Major emphasis is placed upon inveetigation of diffusion characteristics of a horizontal fluid jet with particular interest in the cone-of-diffusion, the cone forrned by mixing of the jet fluid with the surrounding fluid. The angle of expansion of the fluid rnixture is generally referred to as the angle of the cone-of-diffusion. Past studies of the angle are briefly surnmarized while a rather extensive investigation is rnade of factors which affect the vertical position of. the cone-of-diffusion axi s. Graphs are presented which show the effect of initial jet den-sity and velocity, and surrounding fluid density and velocity upon (Major Redacted for Privacy the position of the cone-of-diffusion axis. Curves of the correspond-ing horizontal and vertical positions of the axis are presented. A thorough discussion of equations used to obtain the curves is also in-cluded. Values of densities and velocities are lirnited to those which would apply to an ocean outfall systern used for disposal of dornestic sewage and kraft-rnill effluent