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Table 3
Benthic currents in the CCFZ.
Location
Water
depth
(m)
Above
seabed
(m)
Measured
duration
(days)
Average
direction
Average
speed
(cm/s)
N lat. W lon.
14° 0.5' 131°00' 4,950 35 13 183 1.5 9
25 13 163 2.3 10
13° 6.5' 131° 01' 4,980 35 13 200 1.1 9
25 13 183 2.8 7
13° 31' 132° 57' 4,920 6 13 155 4.3 13.5
8° 27' 150° 49' 5,200 50 143 50 0.35 12
30 143 59 0.57 10
9° 27' 151° 17' 5,200 4 40 63 3 15
9° 26' 151° 17' 5,190 8 40 46 3.3 15
4 40 9 2.9
9° 21' 151° 17' 5,093 4 40 333 1.1
11° 42' 138° 24' 30 197 14.5
14° 38' 125° 29' 4,508 30 156 331 15
6 156 324 13
11° 02' 140° 06' 4,906 4.7 123 5.25 12.5
11° 03' 139° 59' 4,873 4.7 200 4.45 11.2
4° 00' 136° 01' 4,469 4.7 195 10.1
15° 13' 125° 58' 4,655 10 11 273 7
7° 40' 134° 00' 4,705 25 4 56 4.8 8.3
4,590 19 4 99 5.4 9.6
4,700 5 4 63 4.5 8.1
1° 02' 149° 50.7' 4,647 1,500 152 87
Maximum
speed
(cm/s)
Three dynamic regimes are in evidence in the CCFZ:
1. Calm periods, characterised by minimal current speed (0-3
cm/sec), moderate to low variance and low tidal activity. In one
experiment 20 , this time interval lasted about 11 days, 11-21
February 1988.
2. Intermediate, mostly tidal periods, characterised by the alteration
of current speed (0 to 5-6 cm/sec) and velocity, with a
corresponding increase in the variance of the data but with the
117 INTERNATIONAL SEABED AUTHORITY