GeoAcoustics Ltd (Great Yarmouth, UK), a Kongsberg Maritime company, reports that
four GeoSwath systems have been delivered to Rijkswaterstaat (RWS) in the Netherlands.
The S/V Speurder used in the south east corner of Holland to monitor the Maas river and local canals.
Rijkswaterstaat is the arm of the Dutch Ministry of Transportation and Water
Management with responsibilities including the construction and maintenance of
waterways and flood prevention. RWS chose the GeoSwath Plus interferometric multibeam
due to its ability to provide very wide swath bathymetry and side scan from small
survey vessels. It is particularly suitable for the shallow rivers, canals and seas
Accurate survey results
All the GeoSwath Plus installations on RWS vessels are configured with the QINSy
real time interface (from QPS BV, Zeist, The Netherlands) and are set up to provide
highly accurate bathymetric mapping data along with co-registered side scan images.
A requirement during system tests was that the survey results accurately matched
previously acquired survey data, to within 7cm. The trials demonstrated the GeoSwath Plus
data accuracy and repeatability.
As of end February 2009 three RWS vessels were operational with GeoSwath Plus sonars:
The S/V Speurder is being used in the south east corner of Holland to monitor the Maas river
and local canals; The S/V Siege is deployed mainly in the Waddenzee (the shallow
sea in the North of Holland) - its prime purpose is to survey and monitor the ferry
shipping channel from the mainland to the islands, with an additional task of carrying
out hydrographic surveys for various ports in the region; The S/V Markermeer is
located in the Ijsselmeer and is tasked with monitoring the channels that provide
access from the Rhine, Waal and Maas rivers. A fourth vessel will join the Seige
in the Waddenzee this summer.
The GeoSwath Plus can rapidly be moved to a vessel of opportunity if required; for
January 2009 the Spreuder's GeoSwath was deployed on a small shallow draft vessel
to survey the Maas river when water levels were high due to melt water from the
About the GeoSwath Plus Sonar
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 Plus provides high accuracy, high resolution
bathymetry (depth measurement accuracy exceeding the latest IHO specifications),
and co-registered side-scan data. GeoSwath Plus versions are now also available for mounting
on small ROVs and AUVs.