RESTRICTED 



13 



(c) The volume ol' flow v/as obtained by multiplying velocities 

 and cross-sectional areas, tv/o correction factors v/ere intro- 

 duced for flow in the passes. The neasure.'jents v/ere laade in the 

 laiddle of the passes where i low is at a -uaxi:.iu..., isy oceanographic 

 tiieory the average flow in the pass at any given moment should 

 be about three-fourths of the i.iaxiiium flow, and the figures are 

 corrected accordingly. In the second place, the rate of flov/ in 

 the passes is not constant throughout ebb or flood. The change 

 in velocity with tii.ie is roughxy a sine curve, and the average 

 rate of flow can be approxii.iated by luultiplying the flow at /.id- 

 ebb and uid-flow by the factor 2/Tr. Table 3 shov;s the results 

 of the calculations. 



Table 3. Calculated flow into and out of the lagoon 



'^eefs 



[Boby-Nanu 



JNamu-Yuro 



lAraen-Bikini 



JBikini-Snyu 



l^oby-V/est 



r.Yest-Boro i 



o 



-P 



o 

 Q o 





8.4 



9.8, <:^aas^ 



5.4 U-?^ 



S.5 \i-^ck^Z 



6.31- — 



channels 



Rukoji 



Enyu 



Passes 



I 3.5'0.87 

 15.7 1.22 



All SV/ 



Rukoji** 



Eniirikku 



2.0 

 0.6 

 0.4 



2.94 

 3.66 

 5.50 



Velocity cm/sec* , Volume (cia3x 109/sec.) 



Tide stage 

 H E ! L 



To" 

 30 



25 



20 







5 



25 

 45 

 40 

 30 

 20 

 5 



sum 



-5 45 



-2.5I-2.C 



sum 



Slim 



Corrected sum 



- i?aragraph (c) 



H 



4.35 

 5.10 

 2.10 



0.00 



-0.41 



-1.5 

 •4.8 



Tide stage 

 E L 



-5.9 

 -1.1 

 -1.1 



^871 



.6.1 



"5". 04 

 2.70 

 3.90 



1.73 

 -1.02 



•0.25 



77IO 

 -4.5 



-10.3 

 -59.0 



'70.0 

 ■33.4 



0.02 

 0.75 

 0.74 

 0.32 

 0.00 

 0.09 



T792" 



•1.5 

 •4.8 



■^^^73 



-8.9 

 -1.1 

 -1.1 





"071(7 

 3.02 



3.14 



1.30 

 1.36 

 0.2 



TTT 



13.7 



9.9 



29.4 

 11.0 



7.7 



4871 

 22.9 



The net exchange of v;ater is determined from the duration 

 of each stage of the tide and the volume of flow during that time, 

 as shown in Table X»^ 



4 



* Positive values denote inflow, negative values outflow. 





fr'.;csia.--:~^' 



** Ruko ji ri's~a narrow ,^ deep paS's~"wI-tE' shallow reefs on eac& 



side. The type of flow is different in the pass from 

 /that over the reefs, and they are therefore listed 

 ' separately. 



1 



