Sub-Bottom profiling:
Geophysical
survey instruments are typically used to establish the presence of rock
on a pipeline or cable route and as a precursor to coring to identify
unusual seabed features which require investigation. For most
engineering works devices which operate at about 3.5-10khz (pingers,
chirp) or 100-2000hz (boomers) are employed.
Sub-bottom features
can normally be resolved to an accuracy of <0.3m with penetration
depths in excess of 5m. Good data is normally obtained in silts
and sands though in gravels and boulder clays it becomes more difficult
to obtain clear records due to the scattering and spurious reflection of
the acoustic waves. |
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| Comparison of Boomer and Chirp Record |
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| Boomer Sled and Power Source |
Chirp towfish |
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Our Services include: Hydrographic surveys, Bathymetric surveys, Sidescan surveys, Lunar Clocks, Magnetometer surveys, Geophysical surveys, Sub-bottom surveys, Dye surveys, Drogue surveys, Current surveys, Wave surveys, Tide surveys, Echosounding surveys, Marine Outfall Studies, Tide Tables, River Studies, Dredging & Disposal, River Studies, Facilities Planning, Shoreline & Inter-tidal Topographic Survey, Flood Level Studies, Contamination Dispersion. |
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