Abstract This paper presents a source term model to predict the drifting snow near the ground, which is based on the assumption of local equilibrium saltation. The features of the one way coupled conservation equation for the snow transport in the Eulerian reference frame are examined through calibrating the input sources versus output snow concentrations by using a numerical experiment method. The target source term for the snow concentration compensation due to the surface erosion is derived with the help of a semi-empirical mass flow rate of the equilibrium saltation and the calibration results under different friction velocities, threshold friction velocities and settling velocities. With the validation on the equilibrium saltation above an open and flat snow bed, rational saltation mass concentration is solved. Using this source term model, good adaptabilities for various wind and snow conditions are confirmed. With the application to the non-equilibrium saltation around a cube, intuitively plausible distributions of the snow concentration near the ground and the transient topography changes in the snow surface are predicted through a time dependent dynamic mesh solution. The non-equilibrium properties of the drifting snow revealed in space and time are further evidenced by the spatial distributions and time histories of the friction velocity and the saltation snow concentration

中文翻译：

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基于局部平衡跃迁假设的流雪源项模型

摘要 提出了一种基于局部平衡跃迁假设的源项模型来预测近地飘雪。通过使用数值实验方法校准输入源与输出雪浓度，研究了欧拉参考系中雪运移的单向耦合守恒方程的特征。借助平衡跃迁的半经验质量流量和不同摩擦速度、阈值摩擦速度和沉降速度下的校准结果，推导出地表侵蚀引起的雪浓度补偿的目标源项。通过对开阔平坦雪床上方平衡跃迁的验证，解决了合理的跃迁质量浓度问题。使用这个源术语模型，对各种风雪条件具有良好的适应性。通过应用于立方体周围的非平衡跃迁，通过时间相关的动态网格解决方案预测了地面附近雪浓度的直观合理分布和雪面的瞬态地形变化。摩擦速度和跃雪浓度的空间分布和时程进一步证明了流雪在空间和时间上的非平衡特性。通过时间相关的动态网格解决方案，可以预测地面附近雪浓度的直观合理分布和雪表面的瞬态地形变化。摩擦速度和跃雪浓度的空间分布和时程进一步证明了流雪在空间和时间上的非平衡特性。通过时间相关的动态网格解决方案，可以预测地面附近雪浓度的直观合理分布和雪表面的瞬态地形变化。摩擦速度和跃雪浓度的空间分布和时程进一步证明了流雪在空间和时间上的非平衡特性。