Two 1:30- scale physical hydraulic models of the Portugues and Bucana Rivers were used to determine the adequacy of the original designs for the flood control channelization project through the city of Ponce, Puerto Rico. The proposed channelization included trapezoidal to rectangular channel transitions, stilling basins, and drop structures in the high-velocity channels. A 3300-ft (prototype) channel length was used to study the transitions and stilling basins including riprap stability downstream from the stilling basins. A 1200-ft (prototype) channel length was used to study the drop structures and the adjacent riprap protection requirements. Test results indicated that the original design with certain modifications would effectively transmit all expected flood releases from the proposed Portugues and Cerrillos Dams. Modifications to transitions at entrances to the high-velocity channel reaches were streamlined within the original right-of-way to reduce surface turbulence and standing waves. Geometry of the original stilling basins was altered to prevent the oblique hydraulic jumps and the end-sill heights were lowered to reduce the water-surface drawdown, surface roller waves, and high bottom velocities downstream of each basin. The original design Bucana Channel drop structures were recommended for the prototype because the preventive measures required to eliminate the tendency for eddying near design flows created additional problems and cost. Two riprap plans were developed for the four Bucana drop structures with design flows of 24,700 to 27,800 cfs. Satisfactory riprap plans were also developed for the exit channel reaches downstream of each stilling basin. Modification to the Portugues stilling basins were recommended based on the results of the Bucana stilling basin test. After completion of these tests, certain right-of-way changes in the prototype were realized that could alter the location and design of the structures studied.


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    Titel :

    Model Studies of the Portugues and Bucana Rivers Channelization, Puerto Rico: Hydraulic Model Investigation



    Erschienen in:

    Erscheinungsdatum :

    1978


    Format / Umfang :

    6687599


    Medientyp :

    Report


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :