Lock and Dam No. 8 will consist of a 110-by 600-ft lock and a 1120-ft-long, gated, nonnavigable dam. A movable-bed model reproducing 110 miles of the Arkansas River, with a horizontal scale of 1:120 and a vertical scale of 1:80, was used to determine : (A.) the suitability of the proposed site for the lock and dam structure; (B.) adequacy of proposed regulating works in the reach upstream and downstream of the structures and modifications required to provide adequate channel dimensions and satisfactory navigation conditions with minimum maintenance ; and (C.) relative effectiveness of various sizes of initially dredged channels in a section of river similar to the section reproduced in the model downstream of the dam. The results of the investigation indicated the following. Development of an adequate channel in the reach was affected by the natural tendency for the channel to cross toward the right bank upstream of the proposed damsite and by the tendency for the channel to meander in the long flat bend downstream of the dam. Because of these tendencies, considerable modification of the proposed training structures to provide a reasonably stable channel of adequate dimensions would be required. Plans were developed that would provide a channel of adequate dimensions with minimum maintenance with the lock and dam at the proposed site. Additional modifications were also developed to improve navigation conditions in the reach upstream of the dam and in the upper lock approach. Shoaling in the lower lock approach is a natural tendency that can be expected in streams carrying considerable sediment. The amount of shoaling and dredging frequency can be reduced appreciably by the construction of a rock-fill revetment along the left bank to reduce the size of the eddy that forms in the lower lock approach and by the installation of a wing dike extending from the end of the lower guard wall that would permit surface flow to move over the top of the dike and thus prevent bottom currents from moving around the end of the dike into the approach channel. Flow through the lock would reduce the tendency for shoaling in the lower lock approach but generally would not be effective in removing the material deposited because of the dispersion of flow and reduction in velocities after passing the end of the guard wall. Increasing the size of initial dredge cut in the reach below the dam would tend to reduce the amount of maintenance dredging required during the first two years but would tend to increase the total amount of dredging required for the initial cut and maintenance dredging during the period considered. _x000D_ _x000D_ NOTE: This file is large. Allow your browser several minutes to download the file.


    Zugriff

    Download


    Exportieren, teilen und zitieren



    Titel :

    Lock and Dam No. 8, Arkansas River Navigation Project: Hydraulic Model Investigation



    Erschienen in:

    Erscheinungsdatum :

    1973


    Format / Umfang :

    11774077


    Medientyp :

    Report


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :


    Lock and Dam No. 14, Arkansas River Navigation Project: Hydraulic Model Investigation

    Franco, John J. / Shows, Louis J. | HENRY – Bundesanstalt für Wasserbau (BAW) | 1971

    Freier Zugriff

    Lock and Dam No. 13, Arkansas River Navigation Project: Hydraulic Model Investigation

    Franco, John J. / Shows, Louis J. | HENRY – Bundesanstalt für Wasserbau (BAW) | 1970

    Freier Zugriff

    Webbers Falls Lock and Dam, Arkansas River Navigation Project: Hydraulic Model Investigation

    Franco, John J. / Glover, James E. | HENRY – Bundesanstalt für Wasserbau (BAW) | 1969

    Freier Zugriff