The characterisation of surface topography is a complicated branch of metrology, with a huge range of parameters available. The procedure recommended by DNV considers the build-up of initial penetration before the storm and it could be applied in the analysis when the penetration is stabilized after the start -up time (20% of 3-hour).The initial stability after implantology is paramount to the survival of the dental implant and the surface roughness of the implant plays a vital role in this regard. The comparison of these procedures shows that the procedure recommended by PONDUS is the most appropriate for the storm conditions. Three analyzing procedures, namely standard 3-hour procedure, the procedure recommended by PONDUS and the procedure recommended by DNV, could be used for on-bottom stability analysis under storm conditions. The soil property at middle of the pipeline is found to be important when the boundary conditions at both ends are fixed. Hence, different combinations of soil types along the route are applied in the analysis. The pipeline usually crosses different types of soil along the route. The total effect of the increasing friction coefficient depends on the competition between the increased friction force and the reduced passive soil resistance force. The accumulated displacement reduces for large friction coefficient and it results in less penetration.
The friction coefficient affects the soil resistance force and further changes the initial time when the pipeline starts to move in the lateral direction. The development of lateral displacement and penetration for three different friction coefficients are compared for sandy and clayey seabed respectively when applied wave and current conditions are kept same for all the cases. The effect of friction coefficient is first investigated. The objective of the paper is to study the effect of different parameters regarding on-bottom stability of subsea pipelines under combined irregular waves and currents. Journal of Verification, Validation and Uncertainty Quantification.Journal of Thermal Science and Engineering Applications.Journal of Offshore Mechanics and Arctic Engineering.Journal of Nuclear Engineering and Radiation Science.Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems.Journal of Nanotechnology in Engineering and Medicine.Journal of Micro and Nano-Manufacturing.Journal of Manufacturing Science and Engineering.Journal of Engineering Materials and Technology.Journal of Engineering for Sustainable Buildings and Cities.Journal of Engineering for Gas Turbines and Power.Journal of Engineering and Science in Medical Diagnostics and Therapy.Journal of Electrochemical Energy Conversion and Storage.Journal of Dynamic Systems, Measurement, and Control.Journal of Computing and Information Science in Engineering.Journal of Computational and Nonlinear Dynamics.Journal of Autonomous Vehicles and Systems.ASME Letters in Dynamic Systems and Control.ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part B: Mechanical Engineering.Mechanical Engineering Magazine Select Articles.