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Revision as of 09:50, 5 January 2011
Information Page: Complex Flow at Channel Confluence
Play Animation
Complex Flow at Channel Confluence
Key Attributes
| Domain: | terrestrial, hydrology |
| Keywords: | River confluence |
| Keywords: | Eddy simulations |
| Model name: | 3D Detached Eddy Simulations |
| Name: | George, Constantinescu |
| Where: | small river confluence in Illinois |
| When: | Minutes |
Short Description
Grade level: Graduate / Professional
Statement: Forming of eddies in the mixing interface
Abstract: The movie shows a small river confluence in Illinois. The figure shows the bathymetry and dimensions, it is a small system (~8 m wide, 0.65m deep). It is an asymmetrical confluence with concordant bed, the velocity and momentum (rQU) ratios are ~1.0. In that case, the mixing layer development is driven by difference in directions of the streams. Other simulation conditions are: - Re~166,000 (D=0.4m U=0.44 m/s), Fr=0.24 - Maximum scour depth 2.92D
In the movie, obvious eddies develop at the mixing interface, they propagate downstream, complete mixing is not reached in the simulated stretch.
Theory
River confluence example
Confluences are a common element of river networks, especially in the lower reaches and the deltaic floodplain. They are characterized by large-scale turbulent motions. Confluences are even more common in braided river networks, and play an important role in reworking and transporting bedload material.
