一个全面的图片为二元相互作用的水下barchans
A comprehensive picture for binary interactions of subaqueous barchans
摘要：
我们实验研究了两个水下barchans之间发生的短程相互作用。实验是在一个透明材料的水槽中进行的，在水槽中倒入受控的谷物，并在顶部放置一个相机来获取床型的图像。我们改变了颗粒类型（直径、密度和圆度）、堆质量、横向距离、水流速和初始条件。其结果是，五种不同的模式被确定为对齐和偏离中心的配置，我们提出了相互作用的地图，基本上取决于每个沙丘，盾牌数和对齐的barchans的颗粒的数量之间的比率。此外，我们的实验表明，喷射新月形有大致相同的质量的影响之一，在某些情况下，并在唤醒为主的过程中，下游沙丘的不对称性是大的。目前的结果揭示了在地球和其他行星上发现的barchans的大小调节。
英文摘要：
We investigate experimentally the short-range interactions occurring between two subaqueous barchans. The experiments were conducted in a water channel of transparent material where controlled grains were poured inside, and a camera placed on the top acquired images of the bedforms. We varied the grain types (diameter, density and roundness), pile masses, transverse distances, water flow rates and initial conditions. As a result, five different patterns were identified for both aligned and off-centered configurations and we propose interaction maps that depend basically on the ratio between the number of grains of each dune, Shields number and alignment of barchans. In addition, we show experimental indications that an ejected barchan has roughly the same mass of the impacting one in some cases, and that in wake-dominated processes the asymmetry of the downstream dune is large. The present results shed light on the size regulation of barchans found on Earth and other planets.
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