Non-Intrusive Detection of Soil Properties for Pressure-Driven Processes; Conference paper with briefing charts

摘要

The state of the ground can change dramatically in response to changing meteorological influences and physical disturbances of the ground (e.g. tilling) that are important to many civilian and military activities. Permeability is the fundamental parameter of a porous media that controls whether a surface is an acoustically hard one, through which fluids may not easily penetrate, or conversely a more transparent surface, across which gas and water may readily move. Permeability is the property that controls pressure- driven processes including rain infiltration in soils, surface-atmosphere gas exchange, and acoustic response of the ground. Traditionally it has been assumed that atmospheric acoustic waves do not significantly penetrate the ground. In this paper we describe a new result showing that for some common ground surface materials, acoustic wave propagation in the atmosphere can induce pressure propagation into the ground to sufficient depths to permit the non-intrusive detection of soil permeability across the ground surface.