Velocities Induced by Commercial Navigation
Abstract
Studies were conducted to determine the velocities induced by commercial navigation on large inland waterways. The velocity-inducing mechanisms addressed in this study include the propeller jet and the displacement effects of the vessel. Using flow visualization and model and prototype measurements, a better understanding of flow patterns near a moving vessel and obtained. Results show that the propeller jet is not the only mechanism producing significant velocities at the channel bottom. The displacement effects of the vessel also create significant bottom velocities. While return velocities have long been recognized as an effect of the vessel displacement, this study shows that the displacement effects induce a velocity beneath the tow that is generally larger than the return velocity and is not influenced by channel size except for relatively low blockage ratios. Predictive relations were developed for return velocities, propeller jet velocities, and displacement velocities. Keywords: Navigation effects, Navigation models, Propeller jets, Return velocity.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1990
- Accession Number
- ADA227268
Entities
People
- Stephen T. Maynord