Below‐surface horizontal pore gas velocity profiles in response to above‐surface wind conditions were measured for 16 combinations of wind speed (1.4–5.7 ms⁻¹) and wind gust frequency (0–1 Hz) in four porous media with different particle size (0.6–10 mm), yielding 64 combinations of wind condition and porous medium using a recently developed experimental gas tracer tracking method. Experiments were carried out under controlled conditions in a wind tunnel. Gusty wind conditions were created using a wind‐driven propeller operating at variable rotation frequencies. A recently presented empirical model for predicting horizontal pore gas velocity in porous media in response to above‐surface wind conditions was validated against the experimental data. The model uses one empirical parameter (B) together with the wind speed at the surface as input parameters. Further analyses were carried out to identify relations between B, above‐surface wind conditions and porous medium properties. Results indicate that it is possible to accurately estimate B and thus predict below‐surface pore gas velocity profiles based on porous medium properties and surface wind speed. B was found inversely proportional to above‐surface wind speed, porous medium particle diameter and porous medium gas permeability, all in a linear manner.

中文翻译：

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根据地表风条件和介质渗透率预测多孔介质中地表水平孔隙气体速度

在四种不同粒径的多孔介质中，针对风速（1.4–5.7 ms ^-1）和阵风频率（0–1 Hz）的16种组合，测量了响应地表风条件的地下水平孔隙气速度分布（0.6-10 mm），使用最新开发的实验气体示踪剂跟踪方法，可得到64种风况和多孔介质的组合。实验是在受控条件下在风洞中进行的。恶劣的风力条件是使用以可变旋转频率运行的风力螺旋桨创造的。根据实验数据验证了最近提出的用于预测多孔介质在地表风条件下的水平孔隙气体速度的经验模型。模型使用一个经验参数（B）以及地面的风速作为输入参数。进行了进一步的分析，以确定B，地面风况和多孔介质特性之间的关系。结果表明，可以根据多孔介质的性质和地表风速来准确估算B值，从而预测地表下孔隙气体的速度分布。发现B与地表风速，多孔介质粒径和多孔介质气体渗透率成反比，且均呈线性关系。