Unique Utilization of a Physical Model to Develop a Construction Sequence of a Major Cofferdam

by Robert J. Rapp, US Army Corps of Engineers, St., Louis, MO, USA,
Charles W. Denzel, US Army Corps of Engineers, St., Louis, MO, USA,
Thomas J. Pokrefke, US Army Corps of Engineers, St., Louis, MO, USA,

Document Type: Proceeding Paper

Part of: Hydraulics and Hydrology in the Small Computer Age


Lock and Dam 26 Replacement is being constructed on the Mississippi River about 2 miles downstream of the existing Locks and Dam No. 26 at Alton, Illinois. This paper discusses the unique utilization of a moveable bed physical model at the Waterways Experiment Station (WES) in conjunction with the design and development of the second stage construction. The movable bed model reproduce about 6. 7 miles of the Mississippi River to an undistorted scale of 1:120. The model was utilized to simulate second stage construction configurations and the resultant impact upon upstream and downstream navigation approaches, scour between the cofferdam and Illinois bankline, and also scour in the vicinity of cofferdam cell construction.

Subject Headings: Physical models | Construction management | Cofferdams | Movable bed models | Locks (waterway) | Scour | Hydraulic models | Scale models | Mississippi River | Illinois | United States

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