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DREDGE MONITORING SYSTEM AND VIBROCORER FOR MEDITERRANEAN OBSERVATION
Created on
30 June 2012 by osiladmin
0 Comments | Categories: Industry News
OSIL have recently installed two dredge monitoring buoys in the Mediterranean for a marine construction company. OSIL also supplied them with a High Power Vibrocorer system for use in dense or compact sediments in water depths of up to 600m.
The buoys were based on the popular and robust 1.2m Shearwater design, and were equipped with two OBS500 Turbidity Probes, and GPRS telemetry systems transmitting real time data to a live web page. The OBS500 combines a backscatter sensor (better at measuring high turbidity) with a second sidescatter sensor (better at measuring lower turbidity), and incorporates the ClearSensor Antifouling Method to ensure the accuracy of its measurements.
OSIL's Shearwater Buoy is a versatile instrumentation platform ideally suited for collection and measurement of oceanographic, meteorological (metocean) and water quality data parameters in inshore coastal areas, harbours and estuaries. Instrumentation can be deployed anywhere from near surface to the seabed, and the Shearwater Buoys can be used as permanent or temporary platform. The buoys can be moored in a fixed position with either a single point, dual point or compliant mooring system (where required).
The High Power Vibrocorer can rapidly retrieve continuous, undisturbed core samples from unconsolidated and semi-consolidated sediments. The core barrel is vibrated into the sediment whilst fixed to the vibrocorer head. Two large electrical motors power two concentric weights, which produce the necessary vibration. The sediment in immediate contact of the core barrel forms a 'liquefied' boundary layer by the vibration mechanics enabling the core barrel to penetrate the sediment strata. This method of core sampling was refined in the late 1970's and early 1980's and has become an invaluable tool for geotechnical, geological and survey projects where rapid, quality and cost effective collection of sediment data is required.
OSIL's High Power Vibrocorer has been designed as an easy to use, easy to transport modular system capable of collecting well defined cores 100mm in diameter, and up to 9m in length in dense or compact sediments. The cutting shoe and core catcher have been specifically designed to minimise the sample disturbance. The unit has been designed for easy horizontal recovery on to the vessel and then easy recovery of the core barrel once back on deck.
OSIL are also able to produce a low power version for less-compact sediments, utilizing only one electric motor to produce the vibration.
For further information please contact: sales@osil.co.uk or visit www.osil.co.uk
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