1. USS Hawkbill, Pearl Harbor, Hawaii
USS Hawkbill in her former home port of Honolulu, Hawaii. The Pearl Harbor Memorial is visible in the background.
Photograph provided by the CDR R. Perry, officers and crew, USS Hawkbill.
USS Hawkbill, Pearl Harbor, Hawaii

2. 12 kHz Sidescan Swath Bathymetry Sonar
Logo for the Seafloor Characterization and Mapping Pods (SCAMP). The logo was designed at Lamont-Doherty Earth Observatory. The names of the organizations printed on the black background underneath the schematic of the USS Hawkbill contributed to the fabrication of SCAMP. SCAMP development was funded by the National Science Foundation, Lamont-Doherty Earth Observatory of Columbia University, the Palisades Geophysical Institute and the governments of Canada, Norway and Sweden.
12 kHz Sidescan Swath Bathymetry Sonar
kHz Swept Frequency Subbottom Profiler
Gravimeter

3. Unanticipated Findings - Mapping the Ice Canopy
SCAMP was designed to send sound downwards,
but we observed coherent patterns in “outgoing”
portion of the data
Title slide –Technical results section
Examples of SCAMP data:
Left: Sidescan and bathymetry data for three potential drilling sites on the Lomonosov Ridge.
Right: Comparison of bathymetry data for the Lomonosov Ridge. Upper image shoes ETOPO-5 data (used in the GEBCO charts). Lower image shows SCAMP bathymetry data.

4. PORT
SCAMP LOOKS UPWARD
STBD

5. SHADOW ZONE

6. Conditions Controlling Ice Canopy Maps
Water Depth ( m)
Submarine Depth Below Surface (220 ft, 440 ft and 750 ft)
Title slide –Technical results section
Examples of SCAMP data:
Left: Sidescan and bathymetry data for three potential drilling sites on the Lomonosov Ridge.
Right: Comparison of bathymetry data for the Lomonosov Ridge. Upper image shoes ETOPO-5 data (used in the GEBCO charts). Lower image shows SCAMP bathymetry data.

7. Water Depth:
300 – 1000 meters
Submarine Depth:
220 ft below surface

8. In shallowest
areas, swath
width is too
narrow due
to return from
bottom

9. Water Depth:
1000 – 4000 m
Submarine Depth:
750 ft below surface

10. When submarine
is 750 ft deep, the S:N
isn’t sufficient to depict
structure of the ice canopy

11. Water Depth:
300 – 1000 meters
(tend to be deeper)
Submarine Depth:
440 ft below surface
(220 ft on margin)

12. 4-5 km wide swath
shows lineations we
think are keel locations
Parallel orientations
regardless of sub
heading

13. We Find the Optimal Conditions for a 12kHz sonar
Water Depth (>1000 m)
Submarine Depth Below Surface ft
Produces and Ice Canopy Swath of 4-6 km!
Title slide –Technical results section
Examples of SCAMP data:
Left: Sidescan and bathymetry data for three potential drilling sites on the Lomonosov Ridge.
Right: Comparison of bathymetry data for the Lomonosov Ridge. Upper image shoes ETOPO-5 data (used in the GEBCO charts). Lower image shows SCAMP bathymetry data.

14. SCAMP
Magnitude
Phase
Coherent Phase