论文标题
Megaripple力学：双峰运输在双峰砂中
Megaripple mechanics: bimodal transport ingrained in bimodal sands
论文作者
论文摘要
风险砂是一个主要的过程，构成了地球上景观和各种天体的景观。有利于双峰砂转运的条件，具有细粒盐驱动粗粒脂肪的燃料，引起了具有特征性双峰砂组成的巨型的演变。在这里，我们通过概念上简单的定量模型（基于晶粒尺度的物理学）来得出这一特殊的风格过程的统一相图以及随后的非平衡性巨型形态动力学。我们在原本高度可变的晶粒尺寸分布中建立了保存完好的双峰风化传输的定量特征，即其粗粒峰的对数尺度宽度（Krumbein Phi量表）。涵盖广泛的地理来源和环境条件的陆地和外星数据的全面集合支持了这一意外的理论发现的准确性和鲁棒性。它可以帮助解决陆地和外星沉积床形的分类中的歧义。
Aeolian sand transport is a major process shaping landscapes on Earth and on diverse celestial bodies. Conditions favoring bimodal sand transport, with fine-grain saltation driving coarse-grain reptation, give rise to the evolution of megaripples with a characteristic bimodal sand composition. Here, we derive a unified phase diagram for this special aeolian process and the ensuing nonequilibrium megaripple morphodynamics by means of a conceptually simple quantitative model, grounded in the grain-scale physics. We establish a well-preserved quantitative signature of bimodal aeolian transport in the otherwise highly variable grain size distributions, namely, the log-scale width (Krumbein phi scale) of their coarse-grain peaks. A comprehensive collection of terrestrial and extraterrestrial data, covering a wide range of geographical sources and environmental conditions, supports the accuracy and robustness of this unexpected theoretical finding. It could help to resolve ambiguities in the classification of terrestrial and extraterrestrial sedimentary bedforms.
