Experiments in large wind tunnels have made vital contributions to our knowledge of aeolian processes. However, the size of these instruments makes them impractical for field application. To facilitate field measurements on the dust emission potential of soils, the Portable In-Situ Wind Erosion Lab (PI-SWERL) was developed. Previous research shows that the PI-SWERL can be used to quantify dust emission potentials and (threshold) friction velocities. Studies that compare the PI-SWERL to traditional wind tunnels mainly focus on the dust emission potential at various friction velocities. In the present study, we quantified the threshold friction velocity for PM₁₀ emission using a PI-SWERL and compare it to results obtained with a straight-line wind tunnel: the Portable Wind and Rainfall Simulator of the University of Basel (PWRS). Tests were performed on two types of substrate: fine sand (NS1) and loamy sand (DS1). For NS1, a threshold friction velocity of 0.33 m s⁻¹ was identified from both the PI-SWERL and the PWRS data. For DS1, identified threshold friction velocities showed differences: 0.25 m s⁻¹ by the PI-SWERL and 0.39 m s⁻¹ by the PWRS. The position of the DustTrak II monitor’s inlet tube and variations of the fan’s speed by different operators could explain the difference in identified thresholds. Although different threshold friction velocities were obtained for one of the substrates, we believe that comparable results can be achieved by adjusting the experimental design in future research. Therefore, the PI-SWERL can be successfully used to quantify thresholds, facilitating dust emission studies in more remote regions.

大型风洞中的实验为我们的风成过程知识做出了重要贡献。但是，这些仪器的尺寸使得它们在现场应用中不切实际。为了便于现场测量土壤的粉尘排放潜力，开发了便携式现场风蚀实验室（PI-SWERL）。先前的研究表明，PI-SWERL可用于量化粉尘排放潜力和（阈值）摩擦速度。将PI-SWERL与传统风洞进行比较的研究主要集中在各种摩擦速度下的粉尘排放潜力。在本研究中，我们量化了PM ₁₀的阈值摩擦速度使用PI-SWERL进行排放，并将其与直线风洞获得的结果进行比较：直线风洞：巴塞尔大学的便携式风和雨量模拟器（PWRS）。对两种类型的基材进行了测试：细砂（NS1）和壤土砂（DS1）。对于NS1，从PI-SWERL和PWRS数据中都确定了0.33 m s ^-1的阈值摩擦速度。对于DS1，确定的阈值摩擦速度显示出差异：PI-SWERL的0.25 m s ^-1和0.39 m s ^-1由PWRS。DustTrak II监测器进气管的位置以及不同操作员对风扇速度的变化可以解释所确定阈值的差异。尽管对于其中一种基材获得了不同的阈值摩擦速度，但我们相信，通过在未来的研究中调整实验设计，可以获得可比的结果。因此，PI-SWERL可以成功地用于量化阈值，从而促进在更偏远地区的粉尘排放研究。