Sensor Fish Characterization of Fish Passage Conditions Through Johns Day Dam Spillbay 20 With a Modified Flow Depth. Final Report

摘要

Fish passage conditions over a modified deflector in Spillbay 20 at John Day Dam were evaluated by Pacific Northwest National Laboratory for the U.S. Army Corps of Engineers (USACE), Portland District, using Sensor Fish devices. The objectives of the study were to describe and compare passage exposure conditions at two spill discharges, 2.4 and 4.0 thousand cubic feet per second (kcfs), identifying potential fish injury regions within the routes, and to evaluate a low-tailwater condition at the 2.4-kcfs discharge. The study was performed in April 2010 concurrent with HI-Z balloon-tag studies by Normandeau Associates, Inc. Sensor Fish and live fish were released upriver of the spillbay gate at an elevation of 215 feet above mean sea level, determined using a computational fluid dynamics model. Release depth and position were established to introduce the fish and sensors into flows of approximately 5 to 8 feet per second (fps); fish and Sensor Fish were projected to pass 4 feet above the crest of Spillbay 20.