新月形沙丘动力学的粒度依赖性
Grain size dependence of barchan dune dynamics
摘要：
实验研究了新月形沙丘动力学对所涉及的颗粒大小的依赖性。缩小新月形沙丘切片观察在一个狭窄的水流管。从一个初始的对称三角形堆到一个不对称的形状吸引子的弛豫时间增加沙丘质量和粒度减小。沙丘速度随粒度的增大而增大。相反，新月形沙丘的速度尺度和形状与颗粒的大小无关。
英文摘要：
The dependence of the barchan dune dynamics on the size of the grains involved is investigated experimentally. Downsized barchan dune slices are observed in a narrow water flow tube. The relaxation time from an initial symmetric triangular heap towards an asymmetric shape attractor increases with dune mass and decreases with grain size. The dune velocity increases with grain size. In contrast, the velocity scaling and the shape of the barchan dune is independent of the size of the grains.
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