Seafloor Characterization And Mapping Pods (SCAMP)Underway Geophysical Survey From Submarines in the Arctic

Dale Chayes, L-DEO/CU

Outline of This Presentation

• What is SCAMP

• History of SCAMP

• Results from SCAMP

• Future opportunities– Underway survey in the Arctic– SCAMP– Ice canopy mapping

SCAMP Concept

“Velcro” modern mapping sonars onto a nuclear submarine:Swath Bathymetry, Subbottom Profiler, Gravity Meter

SCAMP Collaborators

• Lamont-Doherty Earth Observatory of Columbia University– system integration– data system– major procurements– Operation

• Arctic Submarine Laboratory– SCICEX liaison– TEMPALTs

• Hawaii Mapping Research Group, University of Hawaii– SSBS software– Installation assistance– operation support– SSBS data processing

• Tulane (now UAF)– HRSP processing

SCAMP Major Contractors

• Johns Hopkins Applied Physics Lab– Installation and

TEMPALT support– Design and fabrication

• General Dynamics Electric Boat Div.– Installation and

TEMPALT support– Design and fabrication

• Raytheon Systems – SSBS electronics &

arrays

• Ocean Data Equipment Corp– HRSP system

• Norfolk Naval Shipyard– Design assistance– Diving services

SCAMP Operations• Proposals and

briefings (a lot)• Installation ‘97• Testing• SCICEX ‘98• Remedial effort• SCICEX ‘99• Removal

SCICEX 1999SCICEX 1999 SCICEX 1998SCICEX 1998March - MayMarch - May Aug. - Sept.Aug. - Sept.

Installation

SCAMPResults

• Active volcanism in the Gakkel Ridge

• Deep ice contact features

• New bathymetryFigures courtesy of:Margo EdwardsGreg KurrasJim CochranMaya TolstoyLenonid PolyakBernard Coakley

Operations:Jay ArdaiDale ChayesMark Rognstad

Moraines

ScoursHawkbill Nadir

Deep ice contact features

Deeper ice contact features

Submarines are ideal underway survey platforms in

the Arctic

• Independent of the ice canopy • Stable, quiet, and maneuverable• More miles per day (> 4x) than surface

ships• Reconnaissance sonar survey more

efficient (> 7X ) than surface ships

Phase Coherent Returns in the Blanking Interval?

PORTPORT

STBDSTBD

SCAMP Looks Upward

Ice Draft Measurements (1)

• Historical archive of 637 DIPS data– New submarines have different sonars– Cross calibration is required

• Improved (Swath) Options: – Mature (seafloor technology)– Significantly improved spatial coverage– Adds spatial distribution and texture

Ice Draft Measurements (2)

• The trans-arctic track is parallel to the slope of the thickness gradient

• Small errors in navigation, season or ice draft confound the observations– Add a cross track line to submarine cruises

References

• SCICEX Web Page:www.ldeo.columbia.edu/SCICEX

• SCAMP:www.ldeo.columbia.edu/SCICEX/SCAMP

• SCAMP Swath Bathy Processing:www.soest.hawaii.edu/HMRG/