This investigation is one phase of a general model study to determine the effectiveness of dike systems proposed for improvement of troublesome reaches on the Mississippi River. This report describes and gives results of tests concerned with the development of plans for the improvement of the Buck Island reach of the river, which is located about 700 river miles above Head of Passes. A movable-bed model reproducing approximately 12.5 miles of the Mississippi River to a horizontal scale of 1:300 and a vertical scale of 1:100 with crushed coal as the bed material was used to develop plans that would improve and stabilize the navigation channel through the reach and eliminate or reduce the need for maintenance dredging. The Buck Island reach is a straight reach of river where dike fields have been constructed to form a sinuous navigation channel. During the Mississippi River flood of 1973, failure of two dikes resulted in the forming of a new smaller channel that was not deep enough to allow navigation during low flows. Conditions produced by the new channel made it difficult for tows to navigate the reach, especially during low-flow periods. Plans tested in the model study included improvement and stabilization of the prefailure navigation channel alignment and realignment of the reach to eliminate the crossings. Model results indicated that the original channel alignment could be restored by rebuilding Buck Island dikes 3 and 4; however, some dredging may be required near Commerce Bend. With the addition of two dikes to the original plan above the Basket Bar dikes, some channel improvement on low flows was indicated, although flood flows may continue to shoal at the head of Commerce Bend. Shoaling at Commerce Bend could be reduced by constructing dikes from either the right bank or by extending and adding dikes on the left bank. The reach could be realigned by using either spur or vane dikes. The realigned channel would be easier to navigate and would be more stable during flood flow conditions. Training the flow to follow this alignment would require dredging in addition to the construction of spur dikes. Development of the realignment with vane dikes indicated less construction and maintenance dredging than the spur dike plan. Reconstruction of the existing alignment (Plan A) would require fewer structures than any realignment plan (Plans B through E). During flood years, the existing alignment could be maintained providing that Buck Island dikes 3 and 4 do not fail . The realignment channel would be less likely to be affected by floods and somewhat easier to navigate because of the fewer number of crossings in the reach.


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    Titel :

    Buck Island Reach, Mississippi River: Hydraulic Model Investigation



    Erschienen in:

    Erscheinungsdatum :

    1985


    Format / Umfang :

    7233029


    Medientyp :

    Report


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :


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