What is it about?

High-resolution observations from the curved tidal channel of the Otago Harbour shows secondary flows up to 20% of the primary flow and vertical velocity inferred from secondary flow up to 1% of the primary flow. This vertical velocity is inferred on a much finer scale than previous works. The spatial pattern of this vertical velocity is upward on the inside and downward on the outside of the bend, consistent with previous laboratory flume measurements. Linear regression, r= 0.95, shows the cross-channel distribution of the observed secondary flow can be resolved from the horizontal ADCP measurements well enough to be consistent with the cross-channel distribution of secondary flow derived from the observed primary flow using the model of Kalkwijk and Booij.

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Why is it important?

Provides both theory and observations for this helical flow process which are important for engineering applications such as river channel migration and flood protection.

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This page is a summary of: Distribution of vertical velocity inferred from secondary flow in a curved tidal channel, Journal of Geophysical Research Oceans, September 2014, American Geophysical Union (AGU),
DOI: 10.1002/2014jc010003.
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