论文标题
通过降尺度的水隧道实验研究的Barchan Dune相互作用的演变：时间特征和类似孤子的行为
Evolution of barchan dune interactions investigated by a downscaled water tunnel experiment: the temporal characteristics and a soliton-like behavior
论文作者
论文摘要
本文报告了一个较低的水隧道实验，以研究双重沙丘相互作用系统的时间特征和新的沙丘相互作用模式时，当两个沙丘的初始质量比很大时。这些主题对于对沙丘相互作用系统的全面理解很有用，但以前很少涵盖。定义了沙丘相互作用下的周转时间尺度，并发现其时间平均值与初始质量比有非单调关系。在下游沙丘尖端的凸与初始质量比之间也发现了非单调关系。上面的两个非单调曲线的固定点对应于名为“交换拨号”的相同的沙丘相互作用模式，这在沙丘相互作用的分类图中被认为是必不可少的。上游沙丘充当流体流和下游沙丘之间的能量发射器。当下游沙丘扩大时，就会发生类似孤子的行为，那里的小沙丘与下游沙丘尖端分离，并通过上游沙丘通过大约没有质量交换的上游沙丘。发现这种临时孤子的活性与初始沙丘间距负相关，并且与初始质量比正相关。
This paper reports a downscaled water tunnel experiment to study the temporal characteristics of a double dune interaction system and the new pattern of dune interaction when the initial mass ratio of the two dunes is large. These topics are useful for a comprehensive understanding of the dune interaction system but were rarely covered before. The turnover time scale under dune interaction is defined, and its time averaged value is found to have a nonmonotonic relationship with the initial mass ratio. A nonmonotonic relationship is also found between the convexity of the downstream dune tip and the initial mass ratio. The stationary points of the two nonmonotonic curves above correspond to the same dune interaction pattern named 'exchange-chasing', which is considered indispensable in the classification map of dune interactions. The upstream dune acts as an energy transmitter between fluid flow and the downstream dune. A soliton-like behavior occurs when the downstream dune enlarges, where a small dune is detached from the downstream dune tip and gets passed by the upstream dune approximately without mass exchange. The activity of such temporary soliton is found to be negatively related with the initial dune spacing and positively related with the initial mass ratio.
