Studies on water movements and sediments in Southern Lake Michigan : part 1[-3] ... / by John C. Ayers.

Studies at USPHS Buoy 14
BT- and drogue run, 26 October 1963 (Figs. 9 and 10) On
26 October three drogues were set within a hundred yards of
Buoy 14. Drogue I (130 feet) was set about 100 feet 075~ true
from the buoy; drogue II (tandem double drag, 0-12 feet) was
set about 200 feet from the buoy on the same course; and drogue
III (surface) was set about 300 feet from the buoy on the same
course. The drogues were set (with the ship drifting rapidly)
between 1220 and 1222; 1221 was accepted as the setting time
of all three.
At recovery the drogues were all on a line bearing 018~
true from the buoy. Recovery positions indicated are the
positions of the drogues during a timed run along the line of
their positions. After this run the ship returned and retrieved the drogues.
Drogue I had travelled an apparent 0.46 miles in 2 hours
39 minutes, giving an indicated speed of 0o17 mph for the
current at 126-130 feet. Drogue II had moved an apparent
1,12 miles in 2 hours 35 minutes, indicating,a speed of 0.43
mph. Drogue III covered an apparent 1.36 miles in 2 hours
34 minutes to indicate a velocity of 0.52 mph.
During the approach to the buoy, and after setting the
drogues, the ship carried out a series of bathythermograph
soundings on a course 0980 true from a point 16 miles west of
Buoy 14 to a point 12 miles east of the buoy. Figure 10 presents the components of current normal to the ship's course,
as determined by dynamic heights computation. The curve for
current components in the upper ten meters coincides with that

for surface components over much of the figure; no attempt has

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