Balaenoptera musculus brevicauda

Pygmy Blue Whale — Observability Map

Pekeris waveguide transmission loss at the pygmy blue whale fundamental frequency. Heatmap shows detection range from your position.

Observer position

Bass Strait (default)

39.5°S, 146.0°E — offshore Bass Strait

Pygmy blue whale call parameters

Fundamental frequency 100 Hz

Source level (SL) 188 dB

Southeast Indian Ocean call type · unit B song component · fundamental ~100 Hz with harmonics at 200 & 300 Hz. SL ~188 dB re 1μPa·m (Stafford et al. 2011).

Call frequency (Hz) 100 Hz

Source level (dB re 1μPa·m) 188 dB

Pekeris waveguide parameters

Water depth (m)60 m

Sound speed — water (m/s)1500

Sound speed — seabed (m/s)1700

Seabed density ratio ρ1.80

Seabed attenuation (dB/λ)0.30

Noise floor (dB re 1μPa)85 dB

Sea-state noise (Knudsen/Wenz)

Detection summary

TL at 10 km
— dB

TL at 50 km
— dB

Cutoff freq fc₁

— Hz

Modes at call freq

—

Detection range (SNR = 0 dB boundary)
—

SNR at 50 km— dB

—

Heatmap legend — transmission loss

Low TL

High TL

78 dB← better · worse →120 dB

White rings = distance contours at 10, 50, 100 km.
Cyan contour = detection boundary (SNR = 0 dB).

Impact Pile Driving

Piling Noise — Exclusion Zone Monitor

Real-time Pekeris propagation from pile source. Synthesized strikes drive live SEL accumulation and traffic-light zone status.

Zone status

CLEAR

No animals detected within exclusion zone

Pile position

Bass Strait (default)

39.5°S, 146.0°E — click map to reposition

Click anywhere on the map to move the pile source position.

Strike synthesizer

FUNDAMENTAL BAND

Strike rate (strikes/min) 30/min

Pile SL (dB re 1μPa·m) 210 dB

Fundamental frequency 100 Hz

Waveguide parameters

Water depth (m)40 m

Sound speed — water1500

Sound speed — seabed1650

Seabed density ratio1.90

Seabed attenuation0.50

Ambient noise floor90 dB

Regulatory thresholds

PTS injury (SEL cum) 183 dB

TTS onset (SEL cum) 168 dB

Behavioural disturbance 140 dB

NMFS 2018 / interim cetacean thresholds. Adjust for species hearing group.

Cumulative SEL accumulator

Strikes

—

Rate /min

—

Injury zone

Cumulative SEL (at 1m)— dB

150 dBTTSPTS200 dB

Exclusion zones (Pekeris)

PTS injury radius

— m

TTS onset radius

— m

Behavioural disturbance radius

— m

■ Red = PTS injury ■ Amber = TTS onset ■ Green = behavioural

Pygmy blue whale · 100 Hz · Pekeris TL heatmap

Computing…

Detection rings

10 km

50 km

100 km

SNR=0 dB