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|Title:||Lock and Dam No. 4 cofferdam diversion study, Arkansas River : hydraulic model investigation|
|Authors:||United States. Army. Corps of Engineers. Little Rock District.|
Franco, John J.
Lock and Dam No. 4
|Publisher:||Hydraulics Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; H-71-9.|
Abstract: The investigation reported herein is a result of litigations in connection with a claim against the U.S. Government by the Contractor for the construction of Lock and Dam No. 4 on the Arkansas River. This report describes the model, procedures used, and the results of tests to determine the probable effects that could be expected from the use of the Contractor's proposed diversion plan with flows that have occurred in the Arkansas River and could occur during the period of construction. For this study, a portion of the existing Lock and Dam No. 8 model was converted and modified to reproduce the reach of the river between miles 89.3 and 85.5 to scales of 1:120 horizontally and 1:80 vertically. The movable-bed model was adjusted and operated in accordance with general procedures used on other studies conducted in connection with the development of the Arkansas River. Results indicated the same general trends insofar as developments are concerned regardless of the hydrograph used. Extensive scour occurred along the revetment at the entrance to the diversion channel and along the left bank revetment in the lower reach of the diversion channel. With the revetment within the diversion maintained against strong current attack and deep scouring, sediment would be deposited in the channel downstream of the cofferdam, causing a strong attack on the completed dikes and revetment along the right bank and the newly constructed dikes along the left bank downstream of the diversion channel. The diversion channel would tend to migrate to the left, producing considerable scouring of the overbank area downstream of the diversion channel and an increase in the amount of sediment moved into the reach downstream of the reach reproduced in the model. Failure of the revetment in the diversion channel, which was indicated, would seriously endanger the stability of the cofferdam.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Miscellaneous Paper|