Author(s): M. E. Garner; J. A. Kells; C. Katopodis
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Abstract: Culvert embedment, which involves setting the invert below the normal stream bed elevation, is a simple and inexpensive method of increasing the flow area in a culvert flowing part-full. Embedment has been proposed as a way to decrease the mean flow velocity for the purpose of facilitating fish passage. This paper presents the preliminary findings from a model study of the velocity and turbulence distributions within an embedded CSP culvert. In the study, an acoustic Doppler velocimeter was used to measure point velocities throughout the flow field at several cross sections located along the length of the culvert. The hydraulic conditions were varied by changing the flow rate and the embedment depth. The results confirm that embedding a culvert significantly reduces the flow velocities throughout the cross section and therefore may improve conditions for fish passage. It was also found that embedding the culvert did not decrease the peak turbulence intensities near the culvert inlet, however they were reduced beyond approximately one culvert diameter downstream from the inlet.
Year: 2009