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Publication Abstract

Bank Erosion of the Illinois River Bhowmik, Nani G., and Richard J. Schicht, 1980  Illinois State Water Survey, Champaign, IL,  ISWS RI-92    Full Text Available

Banks of the Illinois River have been eroding because of natural and man-made acts. In many places the erosion is very severe, in other places the banks are stable. The bank erosion of the river was investigated in detail and the results are presented in this report. Field inspection of the river from Joliet to Grafton was made. Extensive bed and bank material samples were collected and grain size distributions were determined. Plan views of 20 selected reaches were developed and the bank slopes at these reaches were determined. Hydraulic parameters were either computed or estimated, and the stability of the banks at all 20 locations was tested following accepted methods and techniques in hydraulics. The stability analysis was done for discharges with and without additional Lake Michigan diversions for three typical water years. In general, the silty, sandy, and clayey materials of these severely eroded banks should be stable against the action of tractive force and flow velocity. However, preliminary computations indicated that the banks are unstable as far as the wind-generated wave action is concerned. It is suspected that river traffic-generated wave action also has a similar effect. A monitoring program is outlined, and a future research project related to the wave action on the banks is suggested.

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