60 



The Surface Unit, including the transitional subunit, 

 ranged from 56°F to 62°F. The subsurface water ranged from 

 51° to 53°. The water unit differential was, therefore, about 

 6°, and the maximum vertical temperature spread was about 10°. 



Heat Budget 



An analysis of the heat budget in the bay has been made 

 by Mr. C. G. Gunnerson, Bureau of Sanitation, Los Angeles, 

 This appears in that Bureau* s publication, "Summary Report 

 on Oceanographic Investigations of Santa Monica Bay, July, 

 1956 n „ The pertinent results of these calculations are 

 shown in Table III. 



The important facts embodied in the calculated budget 

 are? (1) the surprisingly large potential heat contribution 

 from existing and future man-made sources, and (2) the 

 important effect that such heating may have on the neat shore 

 current system. This last is the result of the marked 

 density slope produced at the boundaries of the sewage field 

 as a result of its higher temperature and lower salinity as 

 compared with the shelf water. The foam lines, slicks, films, 

 and color changes are all visible evidence of the existence 

 of this boundary. 



The total heat contributed by the existing outfall is 

 apparently embodied in a layer of slightly diluted sea water 

 varying in thickness from 5 to 20 feet, and covering an area 

 of from 10 to 20 square miles. This layer has probably been 

 formed as a result of the turbulent mixing of effluent and 

 bottom water at the outfall terminus and subsequent mixing 



