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River Dunes and Tidal Sand Waves: Are They Generated by the Same Physical Mechanism?
Water Resources Research ( IF 5.4 ) Pub Date : 2020-05-16 , DOI: 10.1029/2019wr026800 G. Vittori 1 , P. Blondeaux 1
Water Resources Research ( IF 5.4 ) Pub Date : 2020-05-16 , DOI: 10.1029/2019wr026800 G. Vittori 1 , P. Blondeaux 1
Affiliation
Many subaerial and subaqueous morphological patterns are repetitive both in space and time, and a characteristic wavelength L and a characteristic period T can be associated with the bottom forms, along with a migration speed cr=L/T. In this contribution we focus our attention on river dunes, which form under steady flows, and on tidal sand waves, which form under oscillatory flows. Now, it is widely accepted that these bedforms arise because of the instability of the plane interface between the riverbed/seabed, made up of cohesionless sand, and the water flowing over it. However, the physical mechanisms commonly suggested to explain the growth of these two bottom forms differ. In the present contribution, the theories of formation of river dunes and sand waves, based on modal stability analysis, are revisited, and it is shown that the different physical mechanisms proposed to explain the formation of river dunes and sand waves exhibit more similarity than was believed until today.
中文翻译:
河沙丘和潮汐沙波:它们是由相同的物理机制产生的吗?
许多地下和水下形态在空间和时间上都是重复的,特征波长L和特征周期T可以与底部形态相关联,并且迁移速度c r = L / T。在这项贡献中,我们将注意力集中在稳定流动下形成的沙丘和振荡流动下形成的潮沙波。现在,人们普遍认为,这些床形的出现是由于由无粘性砂组成的河床/海床与流过其上的水之间的平面界面不稳定。但是,通常建议用来解释这两种底部形式的生长的物理机制有所不同。在目前的贡献中,重新研究了基于模态稳定性分析的沙丘和沙波形成的理论,结果表明,提出的解释沙丘和沙波形成的不同物理机制比以往具有更多的相似性。相信直到今天。
更新日期:2020-05-16
中文翻译:
河沙丘和潮汐沙波:它们是由相同的物理机制产生的吗?
许多地下和水下形态在空间和时间上都是重复的,特征波长L和特征周期T可以与底部形态相关联,并且迁移速度c r = L / T。在这项贡献中,我们将注意力集中在稳定流动下形成的沙丘和振荡流动下形成的潮沙波。现在,人们普遍认为,这些床形的出现是由于由无粘性砂组成的河床/海床与流过其上的水之间的平面界面不稳定。但是,通常建议用来解释这两种底部形式的生长的物理机制有所不同。在目前的贡献中,重新研究了基于模态稳定性分析的沙丘和沙波形成的理论,结果表明,提出的解释沙丘和沙波形成的不同物理机制比以往具有更多的相似性。相信直到今天。