• Session: 07. Underwater Unexploded Ordnance (UXO) Detection and Remediation
    Organiser(s): Jans Wolfgang, Richardson Mike
    Paper ID: 1002
    Author(s): Menzel Peter, Drews Anja, Otto Christoph, Schütt Clemens
    Presenter: Schütt Clemens
    Presentation type: oral
    Abstract: Offshore construction works are increasing permanently. Especially since offshore wind energy is developing very rapidly, the presence of UXO on the seafloor is an issue for any type of construction works offshore. Expensive and time-consuming UXO campaigns are done to locate, identify, and remove these objects. The release of a site for construction documented in a sign-off certificate is then often given for a limited time assuming potential UXO migration on the seafloor caused by hydrodynamic loads. As a consequence, UXO measures have to be repeated after the expiring of the sign-off certificate. This problem affects subsea cable installation, the installation of offshore pipelines, offshore mining activities, offshore construction works and activities of authorities and navies.\nTo examine the mobilisation of UXO on the seafloor, scour in their vicinity and their burial on a sandy seafloor are of importance. To describe the scour and burial of these objects, experiments in the water-channel of the University of Rostock and at HR Wallingford have been performed. Wind-tunnel experiments have be performed to analyse the mean and turbulent flow structure around the objects at realistic Reynolds numbers. Numerical simulations with different simulation models and codes have been performed to predict scour and burial of such objects. Basing on these studies, models for current- and wave-induced mobilisation of objects on a sandy sea floor have been developed and will be presented. An approach for the practical application in spatial context will be shown.\n
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  • Corresponding author: Dr Menzel Peter
    Affiliation: University of Rostock
    Country: Germany