hydrographic survey 11
Sydney Catchment Authority required a bathymetric
survey to measure the volume of sedimentation
post-construction and to form a baseline for future
surveys. The ‘Felix’ performed the GeoSwath survey
in a single field operation providing total bottom
coverage of the lakebed to the existing water level.
The GeoSwath Plus sonar allows wide swath
bathymetry and side scan data to be collected from
small vessels of opportunity in water depths up to
200m beneath the transducers. The system was
designed to meet the need for a wide swath system
capable of high productivity surveys in very shallow
waters, and can achieve swath widths over 12 times
water depth. The GeoSwath provides high accuracy,
high resolution bathymetry (depth measurement
accuracy exceeding the latest IHO specifications),
and co-registered side-scan data. GeoSwath versions
are now also available for mounting on small ROVs
and AUVs. l
Tom Hiller is with Advanced Products Manager,
GeoAcoustics Ltd, Great Yarmouth, UK. www. Fig. 2. The GeoSwath transducer head stowed for transit on the Felix.
GeoAcoustics.com and www.HydroSurvey.com.au Image: Peter Woolfall, HydroSurvey Australia
GeoAcoustics Ltd. (Great Yarmouth, UK) has been manufacturing marine survey equipment for more than 25 years, and is a
world-leading manufacturer of sonar survey equipment for engineering geophysics and Naval survey applications. Principle product lines
are swath bathymetry systems for shallow waters, side scan sonars and sub-bottom profilers.
Kongsberg Maritime acquired GeoAcoustics Ltd in September 2008.
circle 11 or ✔ at www.engineerlive.com/ihss
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