Hydraulics Near Unscreened Diversion Pipes in Open Channels: Large Flume Experiments

摘要: Most of the water diversions on Sacramento and San Joaquin Rivers (California, United States) their tributaries are currently unscreened. These unscreened commonly used for irrigation potentially harmful to migrating resident fishes. A large flume (test section: 18.29 m long, 3.05 m wide 3.20 m high) was investigate hydraulic fields near an diversion under ecologically hydraulically relevant rates channel flow characteristics. We investigated all combinations three (0.28, 0.42, 0.57 m3/s) sweeping velocities (0.15, 0.38, 0.61 m/s), with one additional test at 0.71 m3/s 0.15 m/s. measured three-dimensional velocity field seven cross sections a pipe constructed regression equations observed maximum pipe. Because components in directions (longitudinal, transverse, vertical) were significantly greater inlet compared those farther from it, they cannot be neglected modeling design fish guidance protection devices pipes. Our results should great value quantifying that formed around more effective fishes entrainment into water-diversion