风沙跃移解析模型的建模思路及存在问题

An overview of analytical models of saltation

以Bagnold模型、S?rensen模型和P?htz-Kok-Herrmann模型(PKH模型)为样本,分析了跃移通量解析模型的发展趋势、建模思路及存在问题。与Bagnold模型不同,Owen类模型的建模包括风廓线方程与颗粒群运动学特征方程的参数化求解等环节。S?rensen模型以反映气固耦合过程的跃移轨迹方程的参数化求解为主要的建模策略。PKH模型分别以气流动量传递方程、能量传递方程及风廓线方程的参数化求解为建模策略,在表观粗糙度、粒载切应力垂直衰减廓线及冲击起动的定量表达等方面取得了重要的进展。改进跃移观测的准确度、进一步理解跃移通量变化的峰值现象、充分考虑多尺度湍流对跃移通量的影响等,是发展解析模型的潜在途径。

Several saltation models including Bagnold model,S?rensen model,and P?htz-Kok-Herrmann(PKH) model have been summarized by analyzing the development trend,model ideas,and problems.In contrast with Bagnold model,the Owen Type of saltation models just like S?rensen model and PKH model involve the parameterized solutions of wind profile equations over aeolian saltation layer and the parameterized motions of saltating particles.The S?rensen model is based on the parametric solution of the leapfrog trajectory equations reflecting the gas-solid coupling process as the main modeling strategy.More specifically and deeply,PKH model parameterizes the force and work rate balances;and the solution of wind profile equations;accordingly,providing new insights into apparent roughness,grain shear stress profile and impact threshold.The analytical saltation models can be improved by more accurate observations,reevaluation of saltation flux peaks,and parameterization of the effect of multi-scale wind on saltation flux.