Maekawa Barrier Attenuation

Single-edge diffraction | Octave bands 63 Hz – 8 kHz

Source name optional

Heights metres above ground

Source (h_s)m

Receiver (h_r)m

Barrier (h_b)m

Horizontal distances metres

Source → barrier (d_s)m

Barrier → receiver (d_r)m

All distances must be greater than 0.

Advanced

Speed of sound (c) m/s · 343 at 20 °C

Barrier does not break line of sight between source and receiver — no shadow-zone attenuation.

Path geometry

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Per-band attenuation

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Simplified Maekawa: A_diff = 10·log₁₀(3 + 20·N), capped at 24 dB. Fresnel number N = 2·δ / λ where δ is the path-length difference (A + B − d). Single thin barrier, single diffraction edge. Ground reflection & thick-barrier effects are not modelled — apply separately or use the result as the barrier insertion-loss input to the SWL → SPL calculator.