predicted. The recorded times of current reversal and 

 maximum currents at Station MP are approximately 1 hour later 

 than at Station TTIC. 



4.3 



Isothermal Data 



Dye concentration data were collected along 41 tracklines and 

 27 vertical profiles during the 4 major tidal phases on 

 25 August. These data were converted to degrees Fahrenheit 

 above ambient water temperatures, contoured at 1.5 , 4 , 5 , 

 and 8 delta-T isotherms and are presented on Figures 10 

 through 13 and as vertical profiles on Figures 14 through 17. 

 The term "delta-T isotherm" will be abbreviated to simply 

 "isotherm" for the remainder of this report. 



The dye concentration mapping was conducted under nearly 

 ideal weather conditions. Seas were calm (less than 1 ft), 

 reducing thermal plume mixing due to wave action to a 

 minimum. The light winds, averaging 2 meters per second, 

 assures that the dispersal of the thermal plume was due 

 predominantly to tidal influences. Conditions were good 

 enough to allow surface expressions of the plume boundaries 

 to be observed during the maximum flood, high slack, and 

 maximum ebb stages of the tiae. 



A further benefit of the good survey conditions is the 

 development of the 1.5° isotherm. Greater wind and wave 

 action would have diminished the lateral extent of this 

 isotherm. As it was, error-free equipment operation combined 

 with excellent site conditions to allowed for clear 

 definition of the 1.5 isotherm. 



- 13 



