Overview of roughening methods in river model experiments
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Abstract:
Resistance similarity is an essential requirement in river model experiments. Roughness recheck is affected by the target value, fluctuation amplitude, model material, and research emphasis. A reasonable roughening method will substantially improve the experiment efficiency and accuracy. In order to help researchers quickly choose a reasonable roughening way from the various existing methods, we sorted and reviewed the commonly used roughening methods, which were classified into three types: block-type roughening, strip-type roughening, and patch-type roughening. We introduced the commonly used roughening elements of each method and described in detail the realization means, advantages, drawbacks, and adjustable roughness range of each method. The patch-type roughening methods represented by plastic grass cushions can achieve a roughness value larger than 0.08. The block-type roughening methods represented by cross plates in the form of plum blossom can obtain a peak roughness value of about 0.06. The peak roughness value of strip-type roughening methods is 0.04. Sticking nylon nets or glass film and compact roughening can generally realize a roughness value no larger than 0.02. Digging pits on the model can hardly increase its surface roughness. In addition, this paper presents the methods’ application conditions, roughening ranges, and influence on flow structure, and some roughness calculation methods. It is hoped that with this paper, researchers can determine roughening methods quickly and exactly according to their experiment goals, and improve their research efficiency.
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