The Santa Paula energy dissipater at the confluence of Santa Paula Creek and Santa Clara River will reduce velocities and dissipate energy from flood flows. Since flood flows could occur in the Santa Paula Channel with little or no tailwater effect from flow in the Santa Clara River, an energy dissipater that will function satisfactorily regardless of tailwater elevation was desirable. Thus, a design with impact blocks placed throughout the structure to gradually reduce velocities and induce backwater in the channel was used. The model investigation was conducted on a 1:20-scale model reproducing a 570-ft-long by 60-ft-wide high-velocity approach channel, a 750-ft-long energy dissipator, and a 500-ft-wide schematic portion of the Santa Clara River. Tests were concerned with flow conditions in the superelevated approach immediately upstream from the energy dissipater, the optimum size and configuration of the dissipater, and stability of the riprap plan at the confluence of Santa Paula Creek and Santa Clara River. Tests revealed that flow conditions in the high-velocity channel and curve immediately upstream of the energy dissipater were satisfactory, while conditions in the original design energy dissipater were unsatisfactory. Modified dissipators were tested in order to reduce high velocities and surface waves that occurred on the apron and continued into the Santa Clara River. The type 33 energy dissipater was developed and resulted in satisfactory flow conditions with design discharge conditions (27,000 cfs) as well as a full range of flows. A 100-ft-long by 100-ft-wide rectangular section of the dissipater apron was removed and a 100-ft-long by 60-ft-wide rectangular section of approach channel was added between the curved section of approach channel and the energy dissipater. Rip rap requirements at the dissipater outlet and Santa Clara River were determined. A satisfactory design for 15-ft-wide access ramps in the Cucamonga Creek project was developed in the Santa Paula energy dissipater model facility after Santa Paula Creek tests were completed. The access ramps were studied in a straight channel section as well as on the inside and outside of a curved section.
Energy Dissipator for Santa Paula Creek, Santa Clara River, California: Hydraulic Model Investigation
Technical Report ; H-73-11
1973
6775892
Report
Elektronische Ressource
Englisch
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