RL'STRICTED 



Table ,4. Net transport (x IQ-'-^^cn^) 



14 



Tide stage 



Diiration (hours) 0,5 



Reefs 



Hieii 



channels 



0.21 

 -0.01 



Passes 



sun 



-0.12 



-0.11 



-0.03 



Ebb 



-0.23 



-2.15 



-6.97 



-7«6 5 



Low 



0.03 



-0.12 



-0.1^ 



Wet inflow 7.86 

 Net outflow 7.92 



-0.24 



Flood 

 5«2 



1772- 



2.50 

 -0.71 



4.29 



7. 86 



During a mean tide of 100 era., the value used in all calcu- 

 lations, the change in the volume of the lagoon is 6.4 x lO-^^cm^, 

 or 2,3% of its total volume. This value is about 20fj lower than 

 the estimate obtained in Table 5. The difference, however, is 

 not large enough to affect the essential validity of the results. 



The tables show that although the net transport is outward 

 at high, ebb, and low tides, some water is brought in over the 

 northern and eastern reefs. i..oreover, some water is lost through 

 Enjm Channel at flood tide. The total transport of water across 

 the periphery of the lagoon is therefore larger than the net 

 tidal transport, A budget of total transport can be obtained by 

 calculating the sum of all positive values and the sum of all 

 negative values as shovm in Table 5. 



Table. 5. Total transport (xl0^^cm3) 



Inflow Outflow 



Reefs 



Channels 



"Pi- 



sses 



0.21 

 1.75 

 0.03 

 1.72 



2V50 



x:2T 



sum 



T7:5F 



-0.01 

 -0.28 



-2,15 

 -0,12 

 -0.71 



-0.11 



-6.97 

 -0.15 



-10.62 



The total transport into and out of the lagoon is therefore 



ifited to he about 10.6 Z lol**" nm^ -nAT TP hnt-i-na ny "k . fH. n-P 



estimated to be about 10.6 x 10-*-^' om-' per 12 hours, or 3.8% of 



df C£^ 



