Prediction of Alternate Bar Wavelength and Height

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Abstract
Several formulas are theoretically and empirically proposed for the alternate bar wavelength. These formulas are tested with laboratory data presented herein and those reported by other workers. It is found that one formula derived in terms of bar stability analysis is invalid for F≧0.8; an alternative empirical formula which is valid for F≧0.8 is proposed. A new formula on the bar height is also obtained empirically on the basis of laboratory data. These formulas are applied to an actual river, and are shown to be reasonable in predicting the bar wavelength and bar height. The possible errors of prediction are estimated to be within about +80% and -40% for both formulas.

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