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

#10 0.18 mph southward
The drogue experiment of 29 October contributes to a degree
of faith in the reality of the streaked current structure that
was indicted by the computed currents.
Indirect Evidence for Current Streaks
Drift bottles released along the Racine to Grand Haven
transect by the then U. S. Bureau of Fisheries on 17 July 1931
showed (Figure 3) an alternation of recoveries from north and
south of the line of releases. This is at least compatible with
the idea that initial bottle movements governed by current
streaks may have determined the ultimate northward or southward
location of recovery points. These studies are reported by
Van Oosten (1963).
Johnson (1960) reported on multiple drift bottle releases
at stations along the Grand Haven-Milwaukee line during July,
August and September of 1954. His results are summarized in
Figure 4. Varying degrees of alternation between northern and
southern (and vice versa) recovery points are shown. In numerous
instances bottles from a single release point had both northern
and southern recoveries, as though these releases might have been
at the interface between oppositely-flowing current streaks.
Both of the above reports show evidences of alternation in
north and south recovery points in the southern basin of Lake
Michigan. North of Frankfort, Michigan, these evidences become
less abundant but do not disappear.
The meaning of the streaked current structure is at present
not known.

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