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

INTRODUCTION

Lake Michigan-is divided into northern and southern -basins
by an area of' elevated and irregular bottom that lies in the
region between Milwaukee, Wisconsin, and Muskegon, Michigan.
While this elevated area is not a complete sill, being cut through
by deep water near the Michigan shore and just off Milwaukee, it
has sufficiently sill-like characteristics to raise questions as
to the effect it may exert on the flushing out of the southern
basin.
This study was undertaken to ascertain whether significant
volumes of water were being exchanged between the northern and
southern basins across the sill. If volume-transport across the
sill exists, its magnitude (plus that of river inflows) in comparison.to the volume of water in the southern basin should give
a clue as to whether the southern basin is well or poorly flushed.
Details about the physical structure of water currents over
the sill were not expected, but have come to light.

1