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|Title: ||Systematic investigation of time scale in movable-bed model|
|Authors: ||Kwan-Tun Lee;Yi-Liang Liu|
|Contributors: ||NTOU:Department of Harbor and River Engineering|
|Keywords: ||model time scale;movable‐bed model;distorted model|
|Issue Date: ||2011-10-20T08:10:37Z
|Publisher: ||Journal of the Chinese Institute of Engineers|
|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 movable-bed 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.|
|Relation: ||27(3), pp.315-321|
|Appears in Collections:||[河海工程學系] 期刊論文|
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