Eliminating Vortices at the Proposed Folsom Dam Auxiliary Spillway
Folsom Dam is on the American River about 20 miles northeast of Sacramento, California. The dam was designed and built by the U. S. Army Corps of Engineers (USACE) and transferred to Reclamation for operation and maintenance in 1956. The dam is a concrete gravity structure 340 ft high and impounds a reservoir of a little more than one million acre-ft. An auxiliary spillway has been proposed that will enhance flood reduction capabilities of the dam. The auxiliary spillway and gate structure will be located in a side channel near the left abutment of the existing spillway. A physical model study of the proposed auxiliary spillway structure at Utah State University revealed that the original proposed design was susceptible to strong surface vortices that were deemed unacceptable. After several unsuccessful attempts to reduce the strength of the vortices, a successful configuration was eventually determined by inclining the upstream head wall (vertical face wall) across the top of the gate structure into the flow at an incline of 20 degrees. This paper focuses on the design changes made at the spillway gate structure to reduce surface vortices resulting from the high velocity approach flow in the approach channel to the auxiliary spillway. Additionally, this paper discusses the potential vortex problems that are associated with submerged radial gate structures located in reservoir approach channels with higher approach velocities in comparison to those seen with typical submerged gates in a reservoir. The iterative process used during the model study to find an acceptable solution and to implement the working model configuration into the final USACE design is also reviewed.
Steven L.Barfuss William J.Rahmeyer Nathan C.Cox
College of Engineering, Utah State University, Logan, Utah 84322, USA US Army Corps of Engineers, Sacramento, California 95814, USA
国际会议
南京
英文
413-420
2010-09-13（万方平台首次上网日期，不代表论文的发表时间）