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

by equal-volume net outflow from the southern basin. At present
it is not known whether the compensatory outflow is subsurface
and through the deep-water channels along the Michigan and
Wisconsin shores, or whether It ocurrs as a counter-oscillation
of the surface layers after release of set-up along shore, or as
a combination of the two.
Water crossing the sill from southern basin to northern
basin constitutes a direct subtraction from the volume content
of the southern basin. In this case a compensatory net inflow
is required, though its location and nature cannot be specified
at present. The compensatory inflow, plus inflow from the
rivers, works to replace a given instant's volume content of the
southern basin.
It appears at present that the functional mechanism for the
flushing of the southern basin is a combination of the addition
of river inflows and a large-volume net transport over the sill.
From about May to about January, winds at Chicago, Muskegon
and Milwaukee are dominantly from the south of west; in the rest
of the months winds are chiefly from the north of west (U. S.
Weather Bureau Tech. Paper 35, 1959, figs 8 through 19). These
wind regimes may be expected to induce a northward net transport
over the sill during summer and fall, and a net southward transport over the sill in mid-winter and sprirg.
The net transports over the sill should be accompanied in
summer and fall by net southward compensatory counter-movement.
In winter and spring the reverse condition should prevail.
Inflows entering a lake basin encounter several turbulent

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