沙丘横向不稳定性
Transverse instability of dunes
摘要：
最简单的沙丘类型是横向沙丘，它以与固定风向正交的不变轮廓传播。在这里，我们显示数值和线性稳定性分析，横向沙丘是不稳定的，相对于沿轴的扰动，在他们的配置文件和衰减的基岩成新月形沙丘。任何强迫调制放大指数与沙丘周转时间决定的增长率。我们估计覆盖的距离由一个横向沙丘完全衰减成barchans之前，并确定不同类型的扰动所产生的模式。
英文摘要：
The simplest type of dune is the transverse one, which propagates with invariant profile orthogonally to a fixed wind direction. Here we show numerically and with a linear stability analysis that transverse dunes are unstable with respect to along-axis perturbations in their profile and decay on the bedrock into barchan dunes. Any forcing modulation amplifies exponentially with growth rate determined by the dune turnover time. We estimate the distance covered by a transverse dune before fully decaying into barchans and identify the patterns produced by different types of perturbation.
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