90-day Monitoring Report - National Marine Fisheries Service - NOAA

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UME04085 R.V Marcus G. Langseth L-DEO/NMFS 05 January 2012 Visual Observation Locations 3:12 49:29 354:14 Figure 6. Total visual effort from observation locations on board the R/V Langseth. 4.3. ACOUSTIC MONITORING SURVEY SUMMARY 16 Tower Bridge BR/TO The hydrophone cable was deployed for the first time on 13 September 2011 after the vessel had completed deployment of the seismic equipment. Acoustic monitoring began immediately at 00:50 UTC and continued throughout the project with PSOs monitoring the hydrophones aurally and monitoring the Pamguard detection software visually both day and night. Acoustic monitoring for the project ended at 04:31 UTC on 05 October 2011 when acquisition of the final survey line was completed and the hydrophone cable was retrieved in preparation for the retrieval of the seismic equipment. Over the course of the project, PSOs conducted 526 hours and 20 minutes of acoustic monitoring, all but 46 minutes occurred while the acoustic source was active (Table 5). There was one period on of acoustic monitoring downtime (6 hours and 15 minutes) on October 2011, when the PAM system could not be utilized because the hydrophone cable was not deployed due to rough seas. Table 5. Total passive acoustic monitoring (PAM) effort. Passive Acoustic Monitoring Effort Duration (hh:mm) Total monitoring while acoustic source active Total monitoring while acoustic source silent Total acoustic monitoring 4.4. SIMULTANEOUS VISUAL AND ACOUSTIC MONITORING SUMMARY 525:34 00:46 526:20 While visual observations began on 8 September 2011 acoustic observations began on 13 September 2011, due to the hydrophone cable needing to be deployed after the airgun arrays to avoid entanglement. Of the total observation effort performed by PSOs during this survey, visual monitoring accounted for 44% (406 hours 55 minutes) while acoustic monitoring accounted for 56% (526 hours 20 minutes). As displayed in Figure 7 there were 294 hours 38
minutes of simultaneous visual and acoustic observations conducted during this survey. Simultaneous visual and acoustic monitoring accounted for 56% of total acoustic monitoring and 72 % of visual monitoring. UME04085 R.V Marcus G. Langseth L-DEO/NMFS 05 January 2012 Hours:Minutes 600:00 480:00 360:00 240:00 120:00 00:00 406:55 4.5. ENVIRONMENTAL CONDITIONS Observation Effort 17 526:20 294:38 Visual Observation Acoustic Observation Simultaneous Visual and Acoustic Observation Figure 7. Total PAM and visual monitoring effort. A majority of visual monitoring effort was conducted during average observations conditions with regular periods of high winds (greater than 20 knots) which could last hours or days at a time. There were brief periods where visibility was obscured or hindered by fog or snow but the safety radii remained visible. Visibility was clear, 5 kilometers or more, for the majority of the cruise (Figure 8). Percentage of Visibility Ranges 66% 4% 30%
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90-day Monitoring Report - National Marine Fisheries Service - NOAA

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