Unexploded Ordnance (UXO) Survey in the Thames Estuary
Arcadis - MV Watch Dog
In January 2016 Seastar Survey Ltd. were contracted to undertake a UXO survey in a predefined area of the Thames estuary. Ferrous objects to 3.3m depth were identified in the area using a transverse gradiometer (TVG) and non-ferrous surface debris was identified using a 900 kHz sidescan sonar. Horizontal positioning was provided using a Leica real time kinematic GPS system.
In June 2015 Seastar Survey Ltd. personnel were sourced at short notice to map the currents at a pipe line landing location to inform on the forces that would be exerted on equipment during operations. Seastar Survey sourced, calibrated and deployed a seabed mounted ADCP (Sentinel V, Teledyne RD Instruments) at the limit of the intertidal region to map currents over a tidal cycle. The data were processed and delivered to the client two days after data collection.
Sustainable Marine Ltd. – MV Willchallenge
In August 2014 Seastar Survey provided, calibrated and undertook the underwater positioning of a drill rig for a prototype tidal turbine using a USBL system. The equipment used was a Sonardyne SCOUT Plus USBL system with 2 x WSM transponders with TSS Gyrocompass, MRU and Leica RTK GPS. Accuracy of < 1m was achieved in very shallow depths (<20m).
In August 2012 Seastar Survey Ltd. was contracted to locate the lost keel of an ocean going racing yacht off Fastnet Rock, Ireland. To locate the keel we used side scan sonar imagery coupled with accurate hydrographic positioning.
Seatech Diving / Titan Salvage – MV Andre B
During March 2013 Seastar Survey Ltd. undertook a survey to locate four 30 m long jack-up rig leg sections in 60m depth off St. Nazaire in the Bay of Biscay, France. The missing legs were located using the C-Max CM2 sidescan sonar system, an exact position of each of the legs was ascertained on the first line run.
Archaeological Survey in Falmouth harbour
Cornwall County Council – SV Mariner
During September 2007 we undertook a seabed mapping survey of Falmouth harbour using a single beam echosounder; GeoChirp sub-bottom profiler; high resolution side scan sonar; and magnetometer. The purpose of the survey was to locate any areas of archaeological interest as part of the Falmouth Harbour redevelopment environmental impact assessment.