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tetrapod.datum SURVEY // CB-0804 · NORTH VORFELD SECT-12 (54°11'04"N 07°53'18"E) 16.0s coupled Helmholtz cavity, toe-scour & diaphone acoustic survey across a 16-tonne perforated Cob hollow cube (CB-0804, tri-axial Ø920mm Venturi ports, central chamber V_0 = 2.14 m³) laid before a curved bullnose wave-return parapet and tidal sluice culvert. · T+02.25s / T+07.55s / T+12.85s — Swell surges drive an internal water piston (+0.88m stroke) up through the central cavity (live Section A–A cutaway), compressing the trapped air pocket from 1.68 m³ down to 0.34 m³ and sweeping the submerged Helmholtz resonance upward from 52.0 Hz to 118.4 Hz until the top blowhole (VENT-Z) chokes in a pressurized spume relief and cast-iron sluice flap clank. · T+02.85s / T+08.20s — Trough drawdown outflow jets scour the basalt shingle toe bed, pitching CB-0804 forward +2.45° with -24.0 mm vertical subsidence away from its dashed yellow Epoch-0 datum contour. · T+00.85s / T+10.10s — Parapet Type-F Diaphone (DIA-03) sounds a C2–G2 fifth (65.4 / 98.0 Hz), terminating in low-pressure valve-breath grunts drooping to 36.7 Hz (C#1).
SURVEY // CB-0804 · NORTH VORFELD SECT-12 (54°11'04"N 07°53'18"E) 16.0s coupled Helmholtz cavity, toe-scour & diaphone acoustic survey across a 16-tonne perforated Cob hollow cube (CB-0804, tri-axial Ø920mm Venturi ports, central chamber V_0 = 2.14 m³) laid before a curved bullnose wave-return parapet and tidal sluice culvert. · T+02.25s / T+07.55s / T+12.85s — Swell surges drive an internal water piston (+0.88m stroke) up through the central cavity (live Section A–A cutaway), compressing the trapped air pocket from 1.68 m³ down to 0.34 m³ and sweeping the submerged Helmholtz resonance upward from 52.0 Hz to 118.4 Hz until the top blowhole (VENT-Z) chokes in a pressurized spume relief and cast-iron sluice flap clank. · T+02.85s / T+08.20s — Trough drawdown outflow jets scour the basalt shingle toe bed, pitching CB-0804 forward +2.45° with -24.0 mm vertical subsidence away from its dashed yellow Epoch-0 datum contour. · T+00.85s / T+10.10s — Parapet Type-F Diaphone (DIA-03) sounds a C2–G2 fifth (65.4 / 98.0 Hz), terminating in low-pressure valve-breath grunts drooping to 36.7 Hz (C#1).
15h