水科学进展2017，Vol.28Issue(5)：712-719,8.DOI:10.14042/j.cnki.32.1309.2017.05.008
选沙相似律对模型沙波相似性影响的试验研究
Effect of sediment motion similarity criteria on sand wave similarity
摘要
Abstract
A comparative flume experiment was conducted with a movable-bed model, and a prototype, to elucidate the effect of applying different similarity criteria in model sand selection on the extent of sand wave similarities. The sand wave dimensions ( wave length and height) at different water levels, and flow velocities, and their variations in the forms of sand wave produced under different discharge sections, were measured to compare the similarities of the sand wave dimensions with the change of flow intensity between the two. In the test, the sand particle sizes were re-spectively determined to satisfy separately a sediment incipient motion similarity law, and a sediment suspension simi-larity law, and then to satisfy them both simultaneously. The results showed that, when the specific gravity and shape of the model were similar to those of the prototype sand wave, the model sand wave that met the similarity of incipient motion criteria was more similar to the prototypical sand wave in terms of sand wave length and height, while the mod-el sand wave that met the similarity of suspension condition had a greater sand wave height and length than the proto-type in general. The extent of sand wave similarities for the model sand wave in terms of wave height and length met both of the aforementioned similarity conditions. The different similarity laws used in model sand selection did not af-fect the changes in the dimensions of the sand wave with increasing relative flow intensities. Although different similar-ity laws were applied, sand waves in all model tests, and the prototype test, could reach the maximum sand wave height at the same relative flow intensity, while sand wave lengths increased with increasing relative flow intensity. It demonstrated that the smaller the deviation from the sediment incipient motion similarity law, the greater the sand wave similarity between the model and prototype.关键词
选沙相似律/波高/波长/相似性Key words
sediment motion similarity criteria/sand wave height/sand wave length/similarity of sand wave分类
建筑与水利引用本文复制引用
徐敏,陈立,何俊,李东锋..选沙相似律对模型沙波相似性影响的试验研究[J].水科学进展,2017,28(5):712-719,8.基金项目
国家重点研发计划资助项目( 2016YFC0402101) （ 2016YFC0402101）
国家自然科学基金资助项目( 11472199) The study is financially supported by the National Key R&D Program of China ( No. 2016YFC0402101) and the National Natu-ral Science Foundation of China ( No. 11472199) . （ 11472199）
