Movie:Complex Flow at Channel Confluence
Information Page: Complex Flow at Channel Confluence
Complex Flow at Channel Confluence
|Model name:||3D Detached Eddy Simulations|
|Where:||small river confluence in Illinois|
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.
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.
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