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Surveys in Extremely Shallow Water

Innomar's parametric sub-bottom profilers offer advantages at all water depths, but a unique feature is the possibility to work in extremely shallow waters as shown below. Sub-bottom profiling in very shallow water using a pinger, boomer, chirp or seismics is difficult due to reverberation and beam pattern issues (e.g. beam width and sidelobes). On the other hand working in areas with very shallow water is required for a wide variaty of applications like

  • surveys in rivers and harbours
  • surveys in coastal areas
  • sediment investigation vor dredging projects
  • pipeline and cable route surveys
  • location and monitoring of buried pipelines and cables
  • underwater archaeology


By using Innomar's shallow water SBP models ("Innomar SES-2000 smart", "Innomar SES-2000 compact", "Innomar SES-2000 light", "Innomar SES-2000 standard") it is possible to achieve excellent sub-bottom data at water depths down to less than 0.5 metres.

 

Extremely Shallow Water Data Examples

The following echo plots show some data examples obtained in extremely shallow waters with water depths less than 5 metres.

Innomar SES-2000 SBP echoprint data example in extremely shallow water (water depth 1-2m)
"Innomar SES-2000 compact"  parametric SBP echoprint data example from an extremely shallow river in Gambia
(water depth 1–2m; range 1–15m below sea level; sediment penetration more than 10m; frequency 10kHz; pulse width 0.2ms).

Innomar SES-2000 SBP echoprint data example in extremely shallow water  (water depth about 0.7m)
"Innomar SES-2000 compact"  parametric SBP echoprint data example obtained in Venice Lagoon
(water depth about 0.7m; range 0–5m below sea level; sediment penetration up to 3m).

Innomar SES-2000 SBP echoprint data example in extremely shallow water (water depth about 1m)
"Innomar SES-2000 compact"  parametric sub-bottom profiler echoprint data example in extremely shallow water
(water depth about 1m; range 1–7m below sea level; frequency 15kHz pulse width 0.13ms).

Innomar SES-2000 SBP echoprint data example in extremely shallow water (water depth about 2m)
"Innomar SES-2000 compact"  parametric sub-bottom profiler echoprint data example in extremely shallow water
(water depth about 2m; range 1–7m below sea level; frequency 8kHz pulse width 0.13ms).

Innomar SES-2000 SBP echoprint data example in extremely shallow water (water depth about 5m)
"Innomar SES-2000 standard"  parametric sub-bottom profiler echoprint data example from a river cable route survey
(water depth 3–7m; range 2–14m below sea level; frequency 8kHz pulse width 0.13ms).

 

Installation Examples

The following pictures show some Innomar SES-2000 SBP installation examples for surveys in extremely shallow-water.

Innomar SES-2000 SBP survey example in extremely shallow water using a small open boat
"Innomar SES-2000 standard"  parametric sub-bottom profiler used on an open boat in very shallow water.
The transducer is mounted at the bow using a pole with GPS antenna on top.

Innomar SES-2000 SBP transducer installation example in extremely shallow water using a small survey boat Innomar SES-2000 sidescan transducer installation example in extremely shallow water using a small survey boat
Transducer installation examples on small boats (left: Innomar SES-2000 SBP transducer, right: Innomar SES-2000 sidescan extension). The transducers are mounted at the bow using a pole with GPS antenna on top. A heave sensor is installed very close to the pole.

 

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