Snow grounds require a layered porous-medium impedance model.
Evidence
The ground sometimes behaves like a layered porous medium, rather than the infinitely thick layer assumed in Eqs. (9) and (10). If we let d be the layer thickness and k2 the wavenumber in the layer, then the resulting impedance of the medium is TM Z = Z2 (Z3 — iZ2 tan k2d) / (Z2 — iZ3 tan k2d), ( 11 ) where Z2 and Z3 are the impedances of the upper and lower materials, respectively, found using Eqs. — Donald G. Albert and John A. Orcutt, Acoustic Pulse Propagation Above…, 26
Categorization
- DEFINE: Introduces the layered-porous-medium impedance treatment — the exact ‘layered porous-snow model’ gap the polyad flagged.
- XREF: connects to: Snow exceeds other natural surfaces in sound absorption by a large margin. — Donald G. Albert and John A. Orcutt, Acoustic Pulse Propagation Above…, 6; Effective flow resistivity is the dominant ground absorption parameter. — Donald G. Albert and John A. Orcutt, Acoustic Pulse Propagation Above…, 73; Impedance discontinuities split an arriving wave into reflected and transmitted parts — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 235 (+2 more)
Related
- Snow exceeds other natural surfaces in sound absorption by a large margin. (similarity 0.87)
- Effective flow resistivity is the dominant ground absorption parameter. (similarity 0.87)
- Lumped impedance treats pipe cross-sections as single units using volume velocity (similarity 0.82)
- Reflection phase at a boundary depends on whether acoustic impedance rises or falls (similarity 0.80)
- Snow is the most sound-absorbent natural ground cover (similarity 0.80)
- Donald G. Albert and John A. Orcutt — Acoustic Pulse Propagation Above Grassland and Snow Comparison of Theoretical and Experimental Waveforms (similarity 0.80)
Broader Connections
- Impedance discontinuities split an arriving wave into reflected and transmitted parts
#expands(0.75) — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 235 - Lumped impedance treats pipe cross-sections as single units using volume velocity
#complicates(0.75) — Eric J. Heller, Why You Hear What You Hear- An…, 103 - Reflection phase at a boundary depends on whether acoustic impedance rises or falls
#expands(0.74) — David Howard, Jamie Angus, coustics and Psychoacoustics, 353