83 



occur offshore more frequently than inshore. There were no 

 instances when the entire Surface Water Unit was "flat" through- 

 out the whole bay. Every month showed temperature slopes of 

 sufficient magnitude to be associated with water motion some- 

 where, In areas where the surface layer exhibits no gradients, 

 the wind is the dominant force contributing to water motion. 

 Since these surfaces occur almost exclusively seaward of a 

 line about three miles from shore, and since the winds here 

 are almost prevailing westerlies, the surface drift must be 

 toward shore with a slight southerly component. The angle 

 between the wind direction and the water motion will not be 

 as great as is known to occur in the open ocean, but from 

 experience is closer to 20°. Therefore, an average condition 

 in any given month would allow surface water in the outer 

 portion of the bay to move shoreward to the southwest until it 

 reached a point two to three miles from the coast where it 

 would be carried either to the north or to the south prior to 

 reaching the beach. 



It is of interest to note that when flat surfaces exist 

 nearshore, there are always gradients offshore which rarely 

 indicate an easterly flow. Thus, even though drift may be 

 to the east inshore, the initial travel from the offshore area 

 will be north or south. Only a rare coincidence of water 

 temperature conditions result in a continuous flow to the east 

 of water originating farther than three miles from the coast. 



Subsurface Water . The Subsurface Water Units do not show 

 the biannual distribution to the same degree as the surface 

 layers. Except for two months, June and October, colder water 



