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

INTRODUCTION TO PART III

This last portion of the final report on work performed
under the contract includes a number of related studies carried out since the expiration of the contract. These related
studies are in part studies that required more time than had
been allowed under the contract; in part they are extensions
of studies originally reported; and in part they are new
studies not actually a part of the contract but which cover
items known to be within the interest area of the USPHS Great
Lakes-Illinois River Basin Projecto
This report presents in final form the work done on current determination by "standard" methods at USPHS anchored
buoy systems to enable cross-comparison of methods by USPHS.
It presents in final form the work done on the development and evaluation of radio-bearing current drogues as means
for following currents for extended periods of time.
A limited amount of data on the annual regime of vertical
temperature distribution in the waters off Chicago is included.
These data were assembled and studied to ascertain whether
density stratification in the local water-column was apt to
result in a two-layered system in which bottom currents might
be differently directed than the surface currents.
In two cases data obtained for other purposes have been
suitable for crude estimates of the dilution rate inherent in
the waters off Chicago.
The areal extent of the oily sediments off Gary, Indiana,
(previously reported) has been determined and their probable

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