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|Title:||Post-pool raise spillway prototype test for Chief Joseph Dam, Columbia River, Washington|
|Authors:||United States. Army. Corps of Engineers. Seattle District.|
Fagerburg, Timothy L.
|Keywords:||Chief Joseph Dam|
Columbia River, Washington
|Publisher:||Hydraulics Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; HL-87-2.|
Abstract: Prototype test data on the hydraulic performance of the standard US Army Corps of Engineers spillway crest at Chief Joseph Dam were obtained following structural modifications to the project required to raise the pool for expansion of hydropower capabilities. These data were correlated with comparable data obtained in model studies of the dam and compared with the data of earlier prototype tests prior to the pool raise. The prototype data consisted of spillway pressure profiles obtained with piezometers, pressure fluctuations indicated by pressure cells embedded in the spillway crest, and vibrations monitored by accelerometers bonded to the trunnion bridge and access gallery floor. The data were obtained at heads of 1.31 and 1.21 times the design head H𝖽 in one gate bay at full and partial gate openings. Good correlation was found between the model and prototype spillway data for the increased head design. The negative pressures in the prototype generally agreed with those predicted in the model. These negative pressures exceeded those obtained in earlier prototype tests primarily due to the increased pool elevation and subsequent higher heads. No significant pressure fluctuations that could cause resonance in the structure were found for any flow condition. No significant vibrations or displacements were evident from the acceleration measurements.
|Appears in Collections:||Technical Report|