Diffusion models applied to channel degradation

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Abstract
The application of the diffusion model to bed degradation due to the sudden cessation of sediment supply to an alluvial system has been investigated and limitations of the model noted. Experiments indicate that local maximum scour depths do not occur at the upstream end of an erodible reach. This was accounted for by modifying the diffusion model to include a mobile upstream boundary scheme. The modified model was calibrated using bed load sediment transport data and diffusion coefficient values of best fit obtained. Significant differences between calibrated and predicted diffusion coefficient values were obtained. Measured and predicted bed profiles were also compared and conclusions about the applicability of the diffusion model to bed degradation drawn.

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