Table 1 Calculations of seabed area and volume disturbed by anchors based on observations from Picton and Wellington anchorages. See methods and Supplementary Table 1 for detailed calucations.
Area (m2) | Maximum volume (m3) | |
|---|---|---|
Estimated footprint for one ship on anchor | 3416 | 2733 |
Documented footprint over 4 years (2017–21) at Picton | 123,000 | 98,400 |
Total footprint observed at Picton, NZ | 1.8 × 106 | 1,440,000 |
Total footprint observed at Wellington, NZ | 6.2 × 106 | 4,960,000 |
Estimated global footprint (in < 80 m water depth) | 5971–20,565 × 106 | 5–16 × 109 |
