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Effects of Drawdown and Structures on Bed-Load Transport in Pool 8 Navigation Channel

By David Abraham and Jon Hendrickson


progress made in using multibeam bathymetric data to determine the effects of a pool drawdown and structures on bed-load transport in the Pool 8 navigation channel. Work was conducted as part of the Monitoring of Completed Navigation Projects (MCNP) program. BACKGROUND: The channel training structures (wing dams and closing dams) that are currently in place on the Upper Mississippi River were constructed more than 100 years ago to increase flow in the navigation channel and cause scour to occur resulting in a deeper channel. Initially, these structures accomplished this goal as evidenced by the islands and sandbars which formed around them. Construction of the locks and dams, 60 years ago, submerged the training structures, reducing their effectiveness and increasing secondary channel and floodplain conveyance. Both training structure submergence and floodplain conveyance are a function of longitudinal position within the pool, generally increasing from the upstream to the downstream end of the pool

Year: 2003
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