风成沙输运的异常标度揭示与床面流变的耦合
Anomalous Scaling of Aeolian Sand Transport Reveals Coupling to Bed Rheology
摘要：
预测风沙的输运速率是风沙研究中的一个核心问题，对气候、环境和行星科学都有影响。虽然自20世纪30年代以来一直在研究，但其背后的多体动力学仍然没有完全理解，最近的经验发现强调了粒子-流体密度比中意想不到的三次方根标度。在这里，通过颗粒尺度的模拟和分析建模，我们阐明了颗粒床碰撞和颗粒蠕变之间的复杂耦合如何在砂床内产生的粘性增强床的可蚀性。我们的最小跃变模型稳健地预测了所观察到的缩放和一个新的不饱和稳态输运状态，我们证实了稀薄大气的模拟。
英文摘要：
Predicting transport rates of windblown sand is a central problem in aeolian research, with implications for climate, environmental, and planetary sciences. Though studied since the 1930s, the underlying many-body dynamics is still incompletely understood, as underscored by the recent empirical discovery of an unexpected third-root scaling in the particle-fluid density ratio. Here, by means of grain-scale simulations and analytical modeling, we elucidate how a complex coupling between grain-bed collisions and granular creep within the sand bed yields a dilatancy-enhanced bed erodibility. Our minimal saltation model robustly predicts both the observed scaling and a new undersaturated steady transport state that we confirm by simulations for rarefied atmospheres.
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