AI 中文总结
基于颗粒尺度水下实验和数值模拟，探讨巴坎沙丘-巴坎沙丘及巴坎沙丘-障碍物相互作用，提出相互作用取决于希尔兹数、斯托克斯数、地貌横向位置及物体尺寸比，展示相关流动、轨迹和合力，解释行为机制并讨论风成影响。
AI 中文摘要
沙丘是由于流体在沙床或沙堆上流动而形成的地貌。当流体主要沿一个方向流动且沙子供应量有限时，会出现新月形沙丘，即巴坎沙丘。这些沙丘是强大的吸引子，存在于地球、火星和其他天体上，通常在沙丘场中它们会相互、与地形及沙丘大小的障碍物相互作用。本文基于颗粒尺度水下实验和数值模拟，讨论了不同的巴坎沙丘-巴坎沙丘及巴坎沙丘-障碍物相互作用的过程和结果。我们提出这些相互作用基本取决于希尔兹数和斯托克斯数（两个无量纲参数）、地貌的横向位置以及相互作用物体之间的尺寸比。此外，我们详细展示了流体流动、颗粒轨迹以及作用在每个颗粒上合力，解释了观察到的不同行为的机制。最后，我们讨论了对风成情况的影响，并对当前研究结果进行了展望。
英文摘要
Sand dunes are bedforms that grow due to the action of a fluid flow over a sand bed or pile. Whenever the fluid flow is mainly in one direction and the availability of sand is limited, crescent-shaped dunes known as barchans appear. These dunes are a strong attractor, being found on Earth, Mars, and other celestial bodies, usually in dune fields where they interact with each other, the terrain, and dune-size obstacles. In this review, we discuss the processes and outcomes of the different barchan-barchan and barchan-obstacle interactions, based on grain-scale subaqueous experiments and numerical simulations. We propose that those interactions depend basically on the Shields and Stokes numbers (that are two dimensionless parameters), the transverse position of bedforms, and the size ratio between the interacting objects. In addition, we show in detail the fluid flow, the trajectories of grains, and the resultant force acting on each grain, explaining the mechanisms for the different behaviors observed. Finally, we discuss the implications for the aeolian case, and put into perspective the current findings.
CommentsAccepted for publication in Philosophical Transactions of the Royal Society A (Accepted Manuscript)
