OVSTKK INVKSTUJATIONS IN (IKOHOIA 



S9 



Table 4.— Water temperature, salinity, and current velocity, Doboy Island 

 APRIL 24, 1929 (SPRING TIDE) 



MAY 2, 1929 (NEAP TIDE) 



6.30 a. m 



7.30 a. m.- 



6.30 a. m 



7.30 a. m 



8a. m 



8.30 a. m 



9 a. m 



9.30 a. m 



10 a. m 



10.30 a. m 



11 a. m 



11.30 a. m 



12 noon 



12.30 p. m 



1 p. m 



5.5 

 5.1 

 5.5 

 5.1 

 4.9 

 5.0 

 5.0 

 5.4 

 5.8 

 6.2 

 6.9 

 7.5 

 8.2 

 8.7 

 9.2 



22.4 

 22.5 

 22.4 

 22.5 

 22.4 

 22.6 

 22.8 

 23.0 

 23.1 

 23.2 

 23.0 

 23.0 

 23.0 

 23.0 

 23.0 



21.92 



18.66 

 21.92 

 18.66 

 17.88 

 16.79 

 16.08 

 15.70 

 13.96 

 13.91 

 13.75 

 13.96 

 15.59 

 18.52 

 18.60 



57.30 



30.41 



57.30 



30.41 



29.07 



11.47 



8.80 



18.53 



16.09 



0.00 



2.31 



2.98 



15,30 



4.32 



NNE. 



NEN. 



NNE. 



NNE. 

 N. by E. 



N. 

 N. by E. 



NNE. 

 N. by E. 



S. by W. 

 S. by W. 

 S. by W. 

 S. by W. 



25.84 



20.69 



25.84 



20.69 



5.27 



0.00 



1.64 



7.19 



1.64 



2.52 



2.52 



0.00 



2.07 



0.00 



N. by E. 

 N. by E. 

 N. by E. 

 N. by E. 

 N. by E. 



N. by E 



V 



S. by W. 

 S. by W. 



S. by W. 



Note -May 1 was the day of least tide range. Observations were not attempted, however, because 

 of a heavy S W wind which disturbed the water in the channel. The mormng of the 2d was calm but on 

 the chanie of tide the wind came up and gradually increased in strength so that observations had to be 

 abandoned at 1 p. m. The storm blew in fuU force from 12.30 until 6, and then gradually died away. 



The direction of the flood current was exceedingly variable and 

 swung from NNE. to SSW. (Table 4.) The shifting of the flood 

 current and the reversing of its direction are due to the position ot 

 Doboy and Commodore Islands with respect to the mouth of Doboy 

 Sound. The incoming flood tide makes up Doboy Sound in a north- 

 west direction and up Back River, lying south of Commodore and 

 Doboy Islands, in a general westerly direction. The flood current 

 coming up Back River meets the mouths of North and Darien Rivers 

 just to the southwest of Doboy Island and is divided three ways- 

 part going up the Darien, part up the North River, and part flows to 

 the NNE. in the channel past Doboy Island. The main flood current 

 making up Doboy Sound is strong enough some two and one-half 

 hours after low water to cause a current to set in a SSW. direction 

 through the channel past Doboy. This set of current, however, lasts 

 only two hours or so, and then reverses to flow in a general NNE. 



