I would like to know about direction of secondary and primary vortex in sharp bend. Are they opposite for all cases? Does secondary vortex occur for all sharp and mild bends near the outer bank?
Flow of Water in bends of open channels 1957 ROZOVSKII, IL
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It's an old but wonderful book. He was so evolved for the time it was published it was virtually ignored by all Western researchers, only the last 10 years that there are references to this book, and incomplete because researchers of fluvial morphology do not adapt to a mathematical treatment is presented in the first two chapters.
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In Chapter III of the book there are dozens of results in model and measurements in rivers. In this book you will find all the answers.
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I could answer your question, based on the information in this book and in specific tests that are being done in our lab, but I think more importantly you have made contact with this book.