Abstract
The flow resistance in rivers is an old and partly unsolved problem. In this study, the bed surface fractal dimension (BSFD) is used to describe the bed morphology, and combined with the bed roughness, a general model experiment is developed. The results show that there is a positive relationship between the BSFD and the bed roughness, which can be further applied to estimate the roughness changes in rivers. These findings will also guide further studies of the mobile-bed flow resistance.
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