| Identifier | 2015-001-FA | ||||||||
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| Purpose | map inner shelf bathymetry, surficial sediment type, geologic framework | ||||||||
| Location | Mid-Atlantic Bight, Delaware/Maryland/Virginia, United States, North America, North Atlantic | ||||||||
| Summary | Collected 5,516 km of geophysical tracklines. 125 grab samples | ||||||||
| Info derived | Sea floor map;Bathymetric maps; sub subsurface data | ||||||||
| Comments | Other instrumentation: Edgetech 512i Other Staffing: Jackson Curie from the PCMSC also participated in the field activity. Inner shelf Delmarva peninsula, Cape Henlopen, DE to Fisherman Island, VA | ||||||||
| Projects |
Other (Other) |
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| Itinerary |
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| Bounds |
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| Organization |
384 Woods Hole Road
Quissett Campus
Woods Hole, MA02543-1598
(508) 548-8700
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| Principal investigators | E. Robert ThielerLaura Brothers | ||||||||||||||||||||||
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| Data category: | Imagery, Location-Elevation, Sampling, Seismics, Sonar |
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| Data type: | Photo, Video, Navigation, Geology, Boomer, Multichannel, Sub Bottom Profiler, Interferometric, Sidescan, Sound Velocity |
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GoPro camera
Photo, Video
1
Bottom photographs and sediment samples were acquired to validate the seafloor interpretations made from geophysical data. Often sediment samplers are unable to recover large-diameter particles, so photographs can document the seafloor character in areas where samples may not be obtained. Two GoPro cameras were mounted to a USGS SEABOSS (Mark II configuration) with a modified VanVeen sampler frame. Approximate SEABOSS dimensions are 115 X 115 X 117 cm. The Van Veen sampler is housed at the bottom and center of the frame at approximately 30 X 32 X 16 cm with a 1/10 sq. meter sample capacity. Two red lasers were mounted on the frame above the sampler, 20 cm apart for scale in bottom photographs. A Keldan (Advanced Lighting Technology) light was mounted at the top of the frame and aimed downward to illuminate the seabed for photographs. Two GoPro cameras were mounted on the frame and set to capture photographs at 2 or 5 second intervals. The GoPro Hero 2 was mounted approximately 70 cm from the bottom of the SEABOSS frame and captured photographs at 2-second interval. The GoPro Hero 3+ was mounted approximately 20 cm from the bottom of the SEABOSS frame and captured video and photographs at 5-second interval. Because the frame was stationary on the bottom of the seabed only one photograph for each camera was chosen to represent the seafloor at each station location. Photographs collected in the water column, on the ship's deck, and duplicate photos of the seafloor were deleted. The Hero 2 field of view includes the Hero 3 GoPro (furthest to the right) and 2 instruments that were attached to the SEABOSS for additional data. The instrument to the left is a Suunto SK-7 dive compass, which shows the orientation of the SEABOSS. The digital readout to the right of the dive compass is the Uwatec dive timer, which shows 4 readouts: upper left is depth in meters, lower left is max depth in meters, upper right is dive time in minutes and lower right is temperature in Celsius (during ascent, this changes to ascent rate in meters per minute and shows an arrow when it senses the rate is too fast).
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SEA SWATHplus-M 234 kHz
Interferometric
1
These swath interferometric bathymetry data were collected to identify sea-floor morphology.
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Sensor - MVP30 (Odim)
Sound Velocity
1
These data were deployed to correct sound velocity artifacts in bathymetery data
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GeoEel 16-channel hydrophone
Multichannel
1
These seismic reflection profile data were collected to image the sediment layers beneath the seafloor.
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Other
Unknown, Multichannel, Boomer, Sub Bottom Profiler, Sparker, Bubble Gun, Air Gun / Water Gun, Ocean Bottom Seismometer, Sonobuoy
(no data)
(No data records have been reported for this equipment)
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Edgetech 4200 sidescan
Sidescan
1
Sidescan sonar data were collected with an Edgetech 4200 dual frequency (100/410 kHz) frequency modulated sidescan-sonar towfish on the M/V Scarlet Isablella. The sonar was towed from the stern A-frame of the vessel. A 3PS digital block cable counter was used to measure the amount of tow cable deployed, and cable out values were transmitted via serial connection to the Edgetech Discover (version 34.0.1.106) acquisition software (lines L40F1 to L47F1) and SonarWiz software (version 6.01.0009) (lines L47F3 to L183-20150714_134804) on the sonar acquisition computer for layback calculation. Tracklines are generally spaced 200m apart.
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Real Time Kinematic GPS
Navigation
1
Navigation data were collected to provide spatial navigation for bathymetric data collection and to spatially correlate the bathymetric data with other data in the GIS.
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Van Veen grab sampler
Geology
1
Bottom photographs and sediment samples were acquired to validate the seafloor interpretations made from geophysical data. Often sediment samplers are unable to recover large-diameter particles, so photographs can document the seafloor character in areas where samples may not be obtained. Two GoPro cameras were mounted to a USGS SEABOSS (Mark II configuration) with a modified VanVeen sampler frame. Approximate SEABOSS dimensions are 115 X 115 X 117 cm. The Van Veen sampler is housed at the bottom and center of the frame at approximately 30 X 32 X 16 cm with a 1/10 sq. meter sample capacity. Two red lasers were mounted on the frame above the sampler, 20 cm apart for scale in bottom photographs. A Keldan (Advanced Lighting Technology) light was mounted at the top of the frame and aimed downward to illuminate the seabed for photographs. Two GoPro cameras were mounted on the frame and set to capture photographs at 2 or 5 second intervals. Samples were recovered when the frame was lifted off the seabed and triggered the Van Veen sampler to close.
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S-Boom seismic source
Boomer
(no data)
MCS seismic data were collected using S-Boom source and a 100-m long GeoEel 16-channel streamer. The applied acoustics S-Boom source was towed astern of the M/V Scarlet Isabella at a power level of 400 joules. The Geometrics GeoEel, 16-channel liquid filled digital streamer was towed from the starboard side of the vessel, and the center of the first channel of the active section was 10 to 20 meters aft of the boomer source. The streamer had a group interval of 3.25 meters connected to Geometrics Streamer Power Supply Unit (SPSU). Data were acquired in Geometrics SEG-D format on Windows PC controller system using Geometrics CNT-1 software. The fire rate was 1 s, the record length was 250 ms and the sample interval was 0.25 ms. (No data records were produced using this equipment)
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