Title: Systematic investigation of time scale in movable‐bed model
Abstract: Abstract The objective of this study is to derive the time scale to be applied to bed‐load transport in movable‐bed experiments. Based on the model similitude law, the hydraulic time scale and the sedimentation time scales, which were derived from nine selected empirical formulas, were compared in detail. The hydraulic time scale is found to usually be smaller than the sedimentation time scale in a length‐scale distorted model. The time‐scale distortion problem can only be solved using a model that employs heavy (more dense) sediment, which is contrary to the general movablebed models that employ light (less dense) sediment. The analytical results show that the deviation between these two time scales increases as the model length‐scale distortion ratio increases. The time‐scale distortion problem may only be negligible when the model has a small length‐scale distortion ratio.
Publication Year: 2004
Publication Date: 2004-05-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 1
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