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SURVEY // TP-1039 · BALTIC MOLE SECT-04 (54°41'12"N 18°40'08"E) 15.0s coupled hydrographic & acoustic settlement log across an 8-tonne precast Sotramer tetrapod armor unit wedged before a perforated Jarlan hollow caisson wall. Three swell surges (crests at 02.15s, 07.45s, 12.35s) compress the circular caisson chambers (38–42 Hz pneumatic modal booms with water-mass pitch loading) before high-suction trough drawdowns trigger three discrete rotational slip events (02.55s, 07.75s, 12.65s; cumulative crown settlement DZ -14.2 mm, tilt +0.85° relative to the dashed Epoch-0 datum contour). Hydrophone HYD-04 (-0.85m OD): calcareous barnacle micro-impulses (2.4–9.5 kHz with 2.5–6.8 ms concrete-face early reflections), sub-aquatic basalt-on-concrete shear grinds during each slip lurch, and two distant diaphone foghorn fifths (C#2–G#2, 69.3 / 103.8 Hz) diffusing through sea mist.

drip.topography

tetrapod.datum: SURVEY // TP-1039 · BALTIC MOLE SECT-04 (54°41'12"N 18°40'08"E) 15.0s coupled hydrographic & acoustic settlement log across an 8-tonne precast Sotramer tetrapod armor unit wedged before a perforated Jarlan hollow caisson wall. Three swell surges (crests at 02.15s, 07.45s, 12.35s) compress the circular caisson chambers (38–42 Hz pneumatic modal booms with water-mass pitch loading) before high-suction trough drawdowns trigger three discrete rotational slip events (02.55s, 07.75s, 12.65s; cumulative crown settlement DZ -14.2 mm, tilt +0.85° relative to the dashed Epoch-0 datum contour). Hydrophone HYD-04 (-0.85m OD): calcareous barnacle micro-impulses (2.4–9.5 kHz with 2.5–6.8 ms concrete-face early reflections), sub-aquatic basalt-on-concrete shear grinds during each slip lurch, and two distant diaphone foghorn fifths (C#2–G#2, 69.3 / 103.8 Hz) diffusing through sea mist. · Simopia