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中国沙漠 ›› 2026, Vol. 46 ›› Issue (5): 314-324.DOI: 10.7522/j.issn.1000-694X.2026.00014

• • 上一篇    

基于离散元法的沙粒冲击沙尘混合表面的动力学过程研究

孙钰博1,2(), 张泓欣1,2, 王正师1,2, 贾淑明2,3()   

  1. 1.西北农林科技大学,资源环境学院,陕西 杨凌 712100
    2.西北农林科技大学,水土保持与荒漠化整治全国重点实验室,陕西 杨凌 712100
    3.西北农林科技大学,水土保持科学与工程学院,陕西 杨凌 712100
  • 收稿日期:2025-09-24 修回日期:2026-01-30 出版日期:2026-09-20 发布日期:2026-11-02
  • 通讯作者: 贾淑明
  • 作者简介:孙钰博(2001—),女,河北邢台人,硕士研究生,主要研究风沙物理过程。E-mail: yubo@nwafu.edu.cn
  • 基金资助:
    国家自然科学基金项目(11902341);国家自然科学基金项目(12102364);中国博士后科学基金项目(2023M742852);中国博士后科学基金项目(2021M702679)

Investigation of the dynamic process of sand particle impacting the sand-dust mixed bed based on the Discrete Element Method

Yubo Sun1,2(), Hongxin Zhang1,2, Zhengshi Wang1,2, Shuming Jia2,3()   

  1. 1.College of Natural Resources and Environment /, Northwest A&F University,Yangling 712100,Shaanxi,China
    2.State Key Laboratory of Soil and Water Conservation and Desertification Control /, Northwest A&F University,Yangling 712100,Shaanxi,China
    3.College of Soil and Water Conservation Science and Engineering, Northwest A&F University,Yangling 712100,Shaanxi,China
  • Received:2025-09-24 Revised:2026-01-30 Online:2026-09-20 Published:2026-11-02
  • Contact: Shuming Jia

摘要:

粒-床碰撞(击溅)过程是连接微观沙粒运动与宏观风沙运动的关键桥梁,现有的纯沙粒击溅函数能否直接应用于沙漠-黄土过渡带的沙尘混合物击溅过程有待进一步研究。本文采用离散元法构建了三维沙尘混合床面离散动力学模型,模拟再现了沙粒冲击混合床面的动力学过程,定量分析了含沙量(70%~100%)对击溅特征的影响规律,并探究了溅起沙粒及其占比的演变规律。结果显示:(1)溅起沙粒占比随含沙量的增长呈线性增长,存在含沙量为80%的临界值,超过该值时溅起沙粒占比大于50%;(2)相比纯沙粒,沙尘混合物的反弹角度明显增大,增大幅度可达56%,同时溅起角度亦有一定程度的增大,可达19%;(3)在已有纯沙粒击溅函数模型基础上,基于本模拟研究结果构建了考虑含沙量的改进击溅函数。

关键词: 沙尘混合物, 击溅过程, 离散元法, 含沙量, 改进击溅函数

Abstract:

The particle-bed collision (splash) process is regarded as a critical bridge connecting microscopic grain-scale dynamics to macroscopic aeolian sand transport. Whether existing pure-sand splash functions can be directly applied to sand-dust mixtures in desert-loess transition zones remains unclear. In this study, a three-dimensional discrete dynamic model of mixed sand-dust beds was developed using the Discrete Element Method (DEM), and the dynamic process of particle impact on mixed beds was simulated. The effects of sand content (70%-100%) on splash characteristics were quantitatively analyzed, and the number of ejected particles and their proportional distribution were quantified. Key findings include: (1) The proportion of ejected particles was observed to increase linearly with sand content, with a critical threshold identified at 80%. Beyond this value, the proportion consistently exceeded 50%; (2) Compared to pure sand, the rebound angle of the sand-dust mixture was significantly increased by up to 56%, with the ejection angle also increasing by up to 19%; (3) An improved sand-content-dependent splash function was developed based on existing pure-sand models and the simulation results of this study.

Key words: sand-dust mixture, splash process, Discrete Element Method (DEM), sand content, modified splash function

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