uu - 



XI. "FIRST ARRIVAL" TESTS 



In addition to the tests for the equilibrium distribution 

 of bleed water and penetration of fresh water discharge some 

 separate tests were run and photographed to determine the mini- 

 mum time required for a parcel of water composed of an hour's 

 discharge from point VI in Humble Canal to travel to the head of 

 Bay Ronquille. It was found that the volume of colored ink 

 tracer released at point VI had to be deposited at a very critical 

 moment near the beginning of a tropical ebb tide in order to 

 reach the head of Bay Ronquille before the following flood car- 

 ried it back toward its starting point. The minimum time re- 

 quired for a parcel to actually reach the head of Bay was 

 approxinately seven or eight hours. 



Experiments in the field show that the travel time on the 

 tropical flood tide from point VI in Humble Canal to Fisherman's 

 cut on the east side of the Freeport Sulphur Company dredge cut 

 is about five hours. The model confirms this result provided 

 the tracer has neutral density. If the tracer is of kineraati- 

 cally (l/l) scaled density the discharge through Fisherman's cut 

 is delayed until the dredge cut basin is filled and a stratified 

 layer established which is almost level with the threshold of 

 Billet Bay, Following this the travel time is the same for 

 solutions of both neutral and kinematic density. 



