A physical model of the confluence of the Chippewa and Mississippi Rivers,
1 to 200 horizontal and I to 40 vertical scale ratios, was constructed and
tested. Commercially available sand, having the mean diameter of 0.42 rom, was
used as the bed material. with this bed material it was found necessary to
distort the Froude number by a factor of 1.85 in order to simulate the sediment
movement correctly. The model was successfully calibrated by reproducing the
bed profile change which occurred in the field between the fall of 1977 and the
spring of 1978.
The model was tested for eight different conditions. Four runs were
specifically devoted to measuring the velocity distribution, water surface
profile, and the bed profile under steady flow conditions. Two r,uns were
conducted to study the filling process of a dredge cut in the Mississippi River.
A run was made to study the response of the river to an extreme condition~ a
combination of a very wet year in the Chippewa River and a very dry year in the
Mississippi River. The last run was for the study of the effect of a low head
dam in the Chippewa River. This report describes the results of, these experimental
runs and presents conclusions and recommendations.
Song, Charles C. S.; Jaramillo, Carlos; Ottensmann, Peggy; Thompson, Christopher.
Part I Physical Modeling Of The Chippewa River - Mississippi River Confluence.
St. Anthony Falls Laboratory.
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