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On day 2008-10-19 the VAM1 OGS-ISMAR VECTOR mooring was recovered. Figure 12 shows the mapping data of the operation. Two sediment traps were removed and the sampled stored at -10°. On day 2008-10-25 the mooring was reconfigured (see Fig.11) and redeployed.
Figure 13 shows the work done, including instrument positioning by trilateration (see Table 8) with the following procedure:
- setting of water depth at deployment area, by CTD pressure data (1210.284dB, 1197.325m, 7.448m above sea bottom, e.g. 1204.7m) and map comparison.
- setting of average sound velocity at deployment area (1520m/s) by CTD data analysis and DESO25 data comparison
- setting of navigation offsets relative to POS0 on point A-FRAME for the three measurement sites, according to ship's position and heading
- Sound Velocity correction of measured ranges by the ratio of 1497 m/s of the OCEANO's TT300 Acoustic Telecommand against the actual 1520 m/s
- plotting and graphical solution
figure
Figure 11:
Mooring VAM1.
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figure
Figure 12:
Mooring VAM-1 Recovery 2008-10-18. Work done. Bathymetry by multibeam, this survey
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figure
Figure 13:
Mooring redeployment 2008-10-25. Work done. Points F1,F2 show the ship positions during transit to deployment (F2 is the dead-weight drop point). Other red points are site of range measurement for trilateration. Bathymetry by multibeam, this survey
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Table 8:
Deployment navigation data 2008-10-25. Range measurements and angle reduced to 1176m (14m Acoustic Release above sea bottom at 1204m, 14m draught of transducer, positioned on point A-Frame ,see 3). Lat/lon data expressed as DDMM.xxxx. Time is UTC.
| LON LAT |
PLANAR ANGLE |
EAST NORTH |
MEASURED |
TIME |
FIX |
| DDMM.xxx |
S.V.CORRECTED |
UTM33 |
OFFSET |
UTC |
FIX |
| 1745.552 4150.263 |
0.0 0.0 0.0 |
729100.5 4635438.6 |
0 0 |
15:10:43 |
F1_PLAN_085N |
| 1745.697 4150.270 |
0.0 0.0 0.0 |
729300.7 4635459.6 |
0 0 |
15:14:37 |
F2_DROP_090N |
| 1745.471 4150.316 |
297.1 14.2 1213.0 |
728984.5 4635534.7 |
1192 5 |
15:28:20 |
R1a_1192_013N |
| 1745.591 4149.531 |
1390.3 49.8 1821.0 |
729197.3 4634086.6 |
1794 3 |
15:48:12 |
R2a_1794_295N |
| 1745.585 4149.541 |
1373.0 49.4 1807.8 |
729189.2 4634104.0 |
1780 4 |
15:50:02 |
R2b_1780_324N |
| 1745.590 4149.549 |
1363.6 49.2 1800.7 |
729194.7 4634119.6 |
1772 5 |
15:51:27 |
R2c_1772_354N |
| 1746.512 4150.438 |
1208.4 45.8 1686.2 |
730418.5 4635805.6 |
1659 5 |
16:05:50 |
R3a_1659_198N |
| 1746.287 4149.926 |
1076.0 42.5 1594.0 |
730137.8 4634849.2 |
1570 3 |
16:17:03 |
R4a_1570_252N |
|
Next: SWATH BATHYMETRY, CHIRP PROFILING
Up: INITIAL RESULTS
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2009-01-11