The Effect of Turbulence in Hydropower Dam Fish Passageways on Pacific Lamprey Passage

Pacific Lampreys (Entosphenus tridentatus) are an anadromous parasitic lamprey found in the northern Pacific Ocean. They migrate up the Columbia River and into its tributaries to spawn. Although, Lower Columbia Dams have fish passageways that are designed for anadromous salmon and steelhead, the passageways are not easily passable for Pacific Lamprey. It has been suggested that the serpentine weirs within the fish passageways are a barrier for Pacific Lamprey. Consequently, a Lamprey dedicated passage systems have been designed and installed on the dams to provide passage and an experimental flume has been designed to study the conditions within the serpentine weirs. Serpentine flume experiments were designed to have three different weir lengths, a turbulence treatment, and three different flows. The velocities through the weir in the flume are similar to those experienced within the serpentine weirs, maximum of approximately 2.4 m/s. An automated acoustic doppler velocimeter (ADV) has been employed to measure velocity and turbulence within the flume on a grid at three different depths near the flume bottom. The ADV data has been completed and is presented in this presentation.