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Chipola Cutoff Reach, Apalachicola River Movable-Bed Model Study
The Chipola Cutoff Reach, Apalachicola River, is located between navigation miles 42.7 and 39.5. This area requires approximately 100,000 cu yd of dredging annually to maintain the 100-ft by 9-ft authorized navigation channel. The model study was conducted to examine the effects of depositing the dredged material on the point bars within the channel banks and in the thalweg of the bendways and to develop a system of contraction works to reduce or eliminate the maintenance dredging. The model, built to a horizontal scale of 1:120 and a vertical scale of 1:80, was of the movable-bed type and allowed flow through the Apalachicola River and through the Chipola Cutoff. Results of the study indicate the following: (a) Thalweg disposal of dredged material has little effect on dredging requirements and the placed material erodes slowly; therefore, the storage capacity is quickly depleted; (b) Within-bank disposal has little effect on dredging requirements; and due to slow erosion of the deposited material, storage capacity is quickly depleted. (c) The system of conventional dikes of Plan A-32 will not provide an adequate channel; and (d) The system of conventional dikes and submerged vane dikes of Plan A-42 will develop and maintain an adequate channel with minimal dredging required.
Chipola Cutoff Reach, Apalachicola River Movable-Bed Model Study
The Chipola Cutoff Reach, Apalachicola River, is located between navigation miles 42.7 and 39.5. This area requires approximately 100,000 cu yd of dredging annually to maintain the 100-ft by 9-ft authorized navigation channel. The model study was conducted to examine the effects of depositing the dredged material on the point bars within the channel banks and in the thalweg of the bendways and to develop a system of contraction works to reduce or eliminate the maintenance dredging. The model, built to a horizontal scale of 1:120 and a vertical scale of 1:80, was of the movable-bed type and allowed flow through the Apalachicola River and through the Chipola Cutoff. Results of the study indicate the following: (a) Thalweg disposal of dredged material has little effect on dredging requirements and the placed material erodes slowly; therefore, the storage capacity is quickly depleted; (b) Within-bank disposal has little effect on dredging requirements; and due to slow erosion of the deposited material, storage capacity is quickly depleted. (c) The system of conventional dikes of Plan A-32 will not provide an adequate channel; and (d) The system of conventional dikes and submerged vane dikes of Plan A-42 will develop and maintain an adequate channel with minimal dredging required.
Chipola Cutoff Reach, Apalachicola River Movable-Bed Model Study
R. A. McCollum (author)
1994
50 pages
Report
No indication
English
Civil Engineering , Hydrology & Limnology , Dredged materials , Disposal , Dredging , Channels , Contraction , Flow , Maintenance , Models , Navigation , Requirements , Rivers , Scale , Storage , Sediments
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