Air permeability, k_a, plays an important role in understanding the air transport behavior in unsaturated soils. As for the measurement of k_a, existing air permeameters using steady-state methods are relatively complicated and costly. Therefore, in this study, a new simple and low-cost air permeameter was developed, which can supply steady air pressure on soil specimen and measure the flow rate of air through soil specimen accurately. To verify the reliability of this new air permeameter, a comparison of k_a of clay, silt loam, and sandy loam specimens measured using the new air permeameter and the one proposed in ASTM D6539 was conducted. One-way analysis of variance shows that the difference of the results from the two air permeameters is not significant (p > 0.05).

空气渗透率k _a在理解非饱和土壤中的空气传输行为方面起着重要作用。对于k _a的测量，现有的使用稳态方法的空气渗透计相对复杂且成本高。因此，在本研究中，开发了一种新的简单、低成本的空气渗透仪，它可以向土壤标本提供稳定的气压，并准确测量空气通过土壤标本的流速。为了验证这种新型透气量计的可靠性，比较了k _a使用新的空气渗透计和 ASTM D6539 中建议的方法对粘土、粉砂壤土和砂壤土样品进行了测量。单因素方差分析表明，两个空气渗透计的结果差异不显着（p > 0.05）。