Poultry houses are one of the major sources of agricultural particulate matter (PM) emissions into the environment. Litter properties, poultry activities, and indoor climate of poultry houses are the main parameters that influence the dust emission, but precise quantitative effects and their interactions are hardly known. The objective of this study was to gain quantitative insight into the dust spreading process from poultry litter by using the discrete parcel method (DPM) and global sensitivity analysis (GSA).The dust spreading process includes the creep, suspension, and saltation of fine particles was simulated with the DPM within the aerial region close to the litter. The simulations proved that a collision between an object and the litter should happen to release particles from the litter into the air. It was indicated that the released particles with a diameter ≥30 μm and particle density ≥1400 kg m⁻³ were deposited on the litter for all tested air velocities. Also, particles <10 μm diameter remained suspended for airflow velocities >1.5 m s⁻¹. The GSA indicated that the creep process has a direct relation with the airflow velocity and coefficient of restitution and an inverse relation with the particle density and the coefficient of friction. Overall, it was shown that the DPM is a suitable numerical technique to simulate the dust spreading process, and hence, it can be recommended for future studies to examine this process on larger scales.

禽舍是农业颗粒物 (PM) 排放到环境中的主要来源之一。垫料特性、家禽活动和禽舍室内气候是影响粉尘排放的主要参数，但精确的定量效应及其相互作用尚不清楚。本研究的目的是通过使用离散包裹法 (DPM) 和全局敏感性分析 (GSA) 定量了解家禽垫料中的灰尘传播过程。 灰尘传播过程包括细颗粒的蠕变、悬浮和跳跃在靠近垫料的空中区域内使用 DPM 进行模拟。模拟证明，物体与垃圾之间的碰撞应该会发生将垃圾中的颗粒释放到空气中。对于所有测试的空气速度，^-3沉积在垫料上。此外，对于>1.5 m s ^{-1 的}气流速度，<10 μm 直径的颗粒保持悬浮。GSA 表明蠕变过程与气流速度和恢复系数有直接关系，与颗粒密度和摩擦系数呈反比关系。总体而言，结果表明 DPM 是一种适合模拟粉尘扩散过程的数值技术，因此，可以推荐在未来的研究中在更大范围内检查该过程。