Donald G. Albert and John A. Orcutt — Acoustic Pulse Propagation Above Grassland and Snow: Comparison of Theoretical and Experimental Waveforms

Yield

3 of 122 paragraphs kept (2.5%). Target: 35%+ — ⚠️ BELOW target.

Thesis

Snow exceeds other natural surfaces in sound absorption by a large margin. · ch. 0

Argument

1. Snow grounds require a layered porous-medium impedance model. — ch. 0
2. Effective flow resistivity is the dominant ground absorption parameter. — ch. 0 └─ #builds-on → Snow grounds require a layered porous-medium impedance model.

Annotation Roundup

Question

• Snow exceeds other natural surfaces in sound absorption by a large margin. — Worth chasing: what effective flow resistivity is a reasonable layered model for late-season hard vs fresh snow, and does adding a sub-snow soil layer change the confound picture? Xref
• Effective flow resistivity is the dominant ground absorption parameter. — Directly satisfies the polyad need: explains the physical mechanism of why snow (low resistivity surface) absorbs high frequencies and elongates late-season recordings — directly relevant to Soundscape Ethnography ground-impedance confounds. Define
• Snow exceeds other natural surfaces in sound absorption by a large margin. — Contrasts the four-parameter physical Attenborough model with the single-parameter semiempirical Delaney-Bazley model — the two impedance frameworks used throughout.
• Snow grounds require a layered porous-medium impedance model. — Introduces the layered-porous-medium impedance treatment — the exact ‘layered porous-snow model’ gap the polyad flagged.