Offshore and inshore surveys

Project - IJmuiden seaport

T&A Survey performed a large-scale UXO waterbottom survey for the construction of a new sealock in IJmuiden, The Netherlands.

Detection in shallow water is often done using a survey boat equipped with several probes on a rack. In deeper waters a so called Fish is used, pulled by a survey boat.The disadvantage of this technology is it’s imprecise positioning and depth measurement. In the seaport of IJmuiden

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Archaeology and UXO in the North Sea

For this project T&A Survey  has mapped the bottom of the North Sea in order to detect possible obstacles for sand mining. These obtacles could be either of archaeological value, like old shipwrecks which by law are required to be handled wih care, or explosives from World War II. T&A has used three different geophysical techniques, which together created a detailed map of the bottom of the ocean: multibeam echo sounder, sidescan sonar and magnetometer.

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Mapping the sludge layer of a sand mining pit with subbottom profiler

T&A Survey to conduct a geophysical water bottom survey for the RuwBouw Group to gain insight into the soil structure and thicknesses of the sludge layer for a sand mining project in Hoogersmilde (Drente). On the project location sand extraction had already taken place in the past. The aim of this field study was to determine the thickness of the sludge layer present in the research area.
T&A chose to use a subbottom profiler for this survey, an acoustic survey technique that, mounted on a survey boat, maps the sediment by dragging a probe over the water surface or water bottom. Depending on the desired accuracy, water bottoms can be mapped from a few meters to many tens of meters in depth and obstacles can be detected on or under the water bottom.

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Reference list offshore and water bottom surveys

Client	Project goal
Rijkswaterstaat	Combineerd offshore sediment survey, North Sea
OpenIJ	Waterbottom UXO detection sealock IJmuiden
Klerk Waterbouw	UXO detection and approach IJmuiden and Schellingwoude
Rijkswaterstaat	UXO detecion and approach Ruimte voor de Lek
Hoogheemraadschap Hollands Noorderkwartier	UXO detection North Sea
Bouwcombinatie Stadsbrug Nijmegen	UXO detection and approach construcion new bridge over Waal river
OceAnco - Alblasserdam Yachtbuilding B.V.	UXO detection and approach
Provincie Noord-Holland	UXO detection and approach Ringvaart and Haarlemmermeerpolder
Dosco Baggerwerken	UXO detectie and approach Aarkanaal, Gouwe and Oude Rijn waterways
Ballast Nedam - De Klerk	UXO detection and approach Amsterdam-Rijnkanaal

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