90-day Monitoring Report - National Marine Fisheries Service - NOAA
90-day Monitoring Report - National Marine Fisheries Service - NOAA
90-day Monitoring Report - National Marine Fisheries Service - NOAA
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Survey Line<br />
UME04085<br />
R.V Marcus G. Langseth<br />
L-DEO/NMFS<br />
05 January 2012<br />
Date<br />
Acquisition<br />
Commenced<br />
Time<br />
Acquisition<br />
Commenced<br />
13<br />
Date Acquisition<br />
Completed<br />
Time<br />
Acquisition<br />
Completed<br />
MGL1112MCS11B4 Seq65 02-Oct-2011 10:12 02-Oct-2011 10:27<br />
MGL1112MCS11B5 Seq66 02-Oct-2011 10:29 02-Oct-2011 14:58<br />
MGL1112MCS11B6 Seq67 02-Oct-2011 15:02 03-Oct-2011 05:58<br />
MGL1112MCS11C Seq68 03-Oct-2011 05:59 03-Oct-2011 07:52<br />
MGL1112MCS11C1 Seq69 03-Oct-2011 07:54 03-Oct-2011 09:50<br />
MGL1112MCS11D Seq70 03-Oct-2011 10:03 03-Oct-2011 21:52<br />
MGL1112MCS12 Seq71 03-Oct-2011 22:29 04-Oct-2011 02:51<br />
MGL1112MCS13 Seq72 04-Oct-2011 03:06 04-Oct-2011 07:13<br />
MGLL1112MCS14 Seq73 04-Oct-2011 07:22 04-Oct-2011 10:36<br />
MGL1112MCS15 Seq74 04-Oct-2011 10:58 04-Oct-2011 17:15<br />
MGL1112MCS16 Seq75 04-Oct-2011 17:41 05-Oct-2011 01:10<br />
MGL1112MCS17 Seq76 05-Oct-2011 01:27 05-Oct-2011 04:41<br />
The acoustic source was active throughout the survey, with a few periods of source silence, for<br />
a total of 531 hours 50 minutes of source activity. This total includes ramping-up of the airguns,<br />
full power and partial power firing both online and during line changes, and operation of a single<br />
40 in³ mitigation airgun (Figure 4). The mitigation source was active during mitigation powerdowns<br />
initiated for protected species inside the safety radius as well as for mechanical/technical<br />
reasons for a total of 1 hour 18 minutes during the survey. Full power source operations<br />
accounted for 94% (500 hours 44 minutes) of airgun activity during the project. Line changes<br />
were often shot at full or partial power, totalling 28 hours 31 minutes of array activity. The full<br />
volume of the acoustic source (9-10 airguns firing) ranged from 1470 in³ to 1830 in³, caused by<br />
the failure of one gun or compressor problems.<br />
00:07<br />
01:10<br />
01:18<br />
28:31<br />
Breakdown of Source Activity<br />
187:59<br />
500:44<br />
Full Volume On Line<br />
Full/Partiall Volume<br />
during Line Change<br />
Single Gun/Mitigation<br />
Ramp-up<br />
Gun Testing<br />
Guns Silent<br />
Figure 4. Breakdown of acoustic source operations.
Change language