Offshore geohazards and seabed mobility
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چکیده
This research stream is focussed on offshore hazards, with particular attention to the mobility of the seabed – whether through large scale geological events, or local scale sediment transport processes. This report is divided into two broad areas. We have extensive activity to report on the subject of seabed mobility, through studies around the O-Tube program (see also the separate report on the O-Tube), and we have continuing studies by Jim Hengesh and Beau Whitney into the geological hazards arising from seismicity onshore and offshore Western Australia.
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Risk Assessment and Management for Offshore Geohazards
The state-of-the-art in understanding offshore geohazards has advanced significantly in the past decade. The advances have been mostly driven by the needs of the offshore petroleum industry. The pace of exploration and field development on the continental slopes and in ultra-deep waters worldwide has increased rapidly during the past decade. Activities are concentrated in areas where the sedime...
متن کاملAn Influence of Trench Formation on Steel Catenary Risers Based on a Hysteretic Nonlinear Seabed Model
A steel catenary riser (SCR) attached to a floating platform at its upper end encounters fluctuations in and near its touchdown zone (TDZ), which causes the interaction with the seabed. Subsea surveys and the analysis of SCR’s indicated that the greatest stress and highest damage occurred near the touchdown point (TDP), where the SCR first touches the seabed. Nowadays, the linear seabed spring ...
متن کاملDetermining Natural Frequency of Free Spanning Offshore Pipelines by Considering the Seabed Soil Characteristics
Free spans or suspended spans normally occur in subsea pipelines due to the irregularity of seabed and byscouring phenomena around the installed non-buried pipeline. The hydrodynamic around the pipeline canlead to a vibration of the pipeline.This kind of vibration may cause fatigue damage to the pipeline. In orderto study the hydrodynamic around the pipeline, calculating the natural frequency o...
متن کاملSteel Catenary Riser-Seabed Interaction Due to Caspian Sea Environmental Conditions
This paper investigates the integrated riser/vessel system which is subjected to random waves. Riser pipelines are the main components of the oil and gas offshore platforms. Whereas Iran country has been located on the fringes of Caspian Sea deep water, therefore study and research in this area is increasingly essential. The fluctuation of floating production causes the severe response and grea...
متن کاملDynamic Response of an Offshore Pile, a Poro-Elastic Seabed and Seawater due to Water Waves
In this study, a coupled model is developed to address the dynamic response of an offshore pile to linear water waves. In the coupled model, the pile and the seabed are treated as a saturated poro-elastic medium described by Biot’s dynamic theory, while the seawater is considered as a conventional acoustic medium. To establish the coupled model, boundary element formulations for saturated porou...
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تاریخ انتشار 2013