Shoaling Conditions in Sawyer Bend and Lower Entrance to Chain of Rocks Canal,Mississippi River. Hydraulic Model Investigation.

摘要

This investigation was concerned with the development of an adequate channel and access to the docking facilities along the right bank in Sawyer Bend and the reduction or elimination of shoaling in the lower entrance to the Chain of Rocks Canal. The alignment of the channel upstream of Mosenthien Island and the movement of sediment from the Missouri River along the right bank caused an increase in flow through the chute channel to the left of Mosenthien Island and shoaling in the channel along the industrial docking facilities in Sawyer Bend. Shoaling in the lower entrance to the canal during low flows has created a serious problem because of the amount of dredging required and the lack of suitable disposal areas. The purpose of the model study was to develop plans that would provide a satisfactory channel in Sawyer Bend and reduce or eliminate the need for dredging in the lower entrance and approach to the Chain of Rocks Canal. A movable-bed model, constructed to scales of 1:250 horizontally and 1:100 vertically, reproduced the Mississippi River and adjacent overbank areas between miles 191.0 and 180.5.