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
梅凡民 1杨倩文 1李旺 1苏进2
作者信息
- 1. 西安工程大学环境与化学工程学院,陕西西安 710048
- 2. 西安工程大学理学院,陕西西安 710048
- 折叠
摘要
以Bagnold模型、Sørensen模型和Pähtz-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.Sørensen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.
Abstract
Several saltation models including Bagnold model,Sørensen model,and Pähtz-Kok-Herrmann(PKH)model have been summarized by analyzing the development trend,model ideas,and problems.In con-trast with Bagnold model,the Owen Type of saltation models just like Sørensen model and PKH model involve the parameterized solutions of wind profile equations over aeolian saltation layer and the parameterized motions of saltating particles.The Sørensen 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 mod-el parameterizes the force and work rate balances;and the solution of wind profile equations;accordingly,pro-viding new insights into apparent roughness,grain shear stress profile and impact threshold.The analytical salta-tion models can be improved by more accurate observations,reevaluation of saltation flux peaks,and parameter-ization of the effect of multi-scale wind on saltation flux.
关键词
跃移通量/风沙颗粒/建模思路/表观粗糙度/粒载切应力Key words
saltation flux/aeolian saltating particle/model ideas/apparent roughness/airborne stress profile引用本文复制引用
基金项目
陕西省自然科学基金项目(2021JM-448)
出版年
2024
NETL
NSTL
万方数据