Windblown sand flow interacts with a number of surface-mounted human-built obstacles. The wind-sand flow perturbation and resulting morphodynamic response of the sand bed cannot be assessed in analytical terms. Therefore, wind-sand tunnel studies around scale physical models are often carried out. They should be driven by physical similarity theory based on dimensionless numbers referred to the whole multiphase and multiscale flow. However, similarity requirements cannot be fully satisfied under typical testing conditions and attention should be paid on the extent of the similarity relaxation. In this study, the background of wind-sand tunnel testing of surface-mounted obstacles is recalled by reviewing wind tunnel setups and similarity requirements. Then, a wind-sand tunnel campaign on a Sand Mitigation Measure is described and critically discussed. The setup dimensionless numbers are compared with statistics on those of past studies. The inescapable relaxation of similarity requirements is motivated by the test goals. The time evolution towards in-equilibrium conditions of both sand bed morphodynamics and sand transport is discussed. Finally, the results of engineering interest are described: the Sand Mitigation Measure sand trapping performance is assessed in dimensionless terms through the measurements of the incoming and outgoing sand concentration in air.

风沙流与许多表面安装的人为障碍物相互作用。不能用解析的方式来评估风沙流的扰动以及由此产生的沙床的形态动力响应。因此，经常围绕规模物理模型进行风沙隧道研究。它们应该由物理相似性理论驱动，该理论基于无量纲数，它是指整个多相和多尺度流。但是，在典型的测试条件下不能完全满足相似性要求，因此应注意相似性松弛的程度。在这项研究中，通过回顾风洞的设置和相似性要求，回顾了风洞试验的表面安装障碍物的背景。然后，描述并严格讨论了采用减沙措施的风沙隧道运动。将设置的无量纲数字与过去研究的统计数据进行比较。测试目标会促使不可避免地放宽相似性要求。讨论了砂床形态动力学和砂运向不平衡状态的时间演化。最后，描述了对工程感兴趣的结果：通过测量空气中流入和流出的沙子浓度，以无量纲的方式评估了减沙措施的捕沙性能。讨论了砂床形态动力学和砂运向不平衡状态的时间演化。最后，描述了对工程感兴趣的结果：通过测量空气中流入和流出的沙子浓度，以无量纲的方式评估了减沙措施的捕沙性能。讨论了砂床形态动力学和砂运向不平衡状态的时间演化。最后，描述了对工程感兴趣的结果：通过测量空气中流入和流出的沙子浓度，以无量纲的方式评估了减沙措施的捕沙性能。