Table 1 Summary of plume measurements.
From: Measurement and modelling of deep sea sediment plumes and implications for deep sea mining
Nominal range to lander | Average currents during ROV plume generation | Approx. Time taken for plume to reach lander (seconds) | Average SPM Concentration During Plume event (mg/l)* | |||
|---|---|---|---|---|---|---|
Speed (m/s) | Direction (Deg N) | Bottom OBS (0.5 m above bed) | Mid OBS (1.0 m above bed) | Top OBS (1.5 m above bed) | ||
Location 1 | ||||||
25 m | 0.07 | 198 | 332 | 4.4 | 3.5 | 3.1 |
25 m | 0.09 | 194 | 243 | 9.7 | 6.4 | 5.1 |
50 m | 0.11 | 200 | 432 | 2.6 | 1.8 | 1.4 |
100 m transect | 0.13 | 227 | 757 | 1.0 | 0.8 | 0.8 |
Location 2 | ||||||
25 m transect | 0.11 | 135 | 200 | 1.4 | 1.4 | 1.8 |
25 m | 0.05 | 145 | 467 | 1.3 | 1.5 | 1.6 |
25 m | 0.03 | 156 | 680 | 0.4 | 0.5 | 0.6 |
50 m transect | 0.14 | 177 | 360 | 6.0 | 5.3 | 5.6 |
50 m | 0.11 | 179 | 445 | 1.7 | 1.3 | 1.8 |
50 m | 0.18 | 184 | 267 | 6.3 | 4.3 | 3.8 |
50 m | 0.15 | 182 | 300 | 5.0 | 4.2 | 4.2 |
100 m transect | 0.12 | 206 | 840 | 3.9 | 3.3 | 3.4 |
100 m | 0.13 | 194 | 730 | 2.7 | 1.9 | 1.8 |
Location 3 | ||||||
25 m | 0.09 | 176 | 307 | 0.3 | 0.4 | 0.5 |
25 m | 0.11 | 162 | 271 | 1.0 | 1.1 | 1.5 |
50 m transect | 0.10 | 163 | 497 | 4.2 | 3.4 | 3.2 |
50 m | 0.11 | 162 | 458 | 0.6 | 0.5 | 0.5 |
50 m | 0.08 | 161 | 561 | 1.0 | 0.8 | 0.7 |
100 m transect | 0.09 | 189 | 1023 | 1.1 | 1.2 | 1.3 |
