Author
A. Vijaya kumar
Other affiliations: Indian Institute of Technology Madras
Bio: A. Vijaya kumar is an academic researcher from National University of Singapore. The author has contributed to research in topics: Pore water pressure & Submarine pipeline. The author has an hindex of 2, co-authored 2 publications receiving 36 citations. Previous affiliations of A. Vijaya kumar include Indian Institute of Technology Madras.
Topics: Pore water pressure, Submarine pipeline, Wave height
Papers
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TL;DR: In this article, the authors investigated wave-induced pressures and uplift forces on a submarine pipeline (exposed, half buried and fully buried) in clayey soil of different consistency index both in regular and random waves.
25 citations
TL;DR: In this article, the wave pressure and uplift force due to random waves on a submarine pipeline (resting on bed, partially buried and fully buried) in clayey soil are measured.
21 citations
Cited by
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TL;DR: The morphology of resultant scour signatures are controlled by the orientation of the wreck structure in relation to the prevailing hydrodynamic regime, the morphology and size of the ship and individual site components, the hydrodynamical regime (currents, waves or combined waves and currents), bathymetry and the geology of the site (seafloor and sub-surface conditions) as mentioned in this paper.
76 citations
TL;DR: A review of the existing research on the interaction between a pipeline and an erodible bed exposed to waves and/or currents is presented in this paper, where the basic mechanism that leads to scour in two-dimensional and three-dimensional (3D) cases is first described, as deduced from small-scale laboratory experiments.
Abstract: A review of the existing research on the interaction between a pipeline and an erodible bed exposed to waves and/or currents is presented. The review covers three topics: scour, liquefaction, and lateral stability of pipelines. The basic mechanism that leads to scour in two-dimensional (2D) and three-dimensional (3D) cases is first described, as deduced from small-scale laboratory experiments. The onset of scour from piping and the developing tunnel erosion are among the processes described. The lateral expansion of the scour hole along the pipe is described, also based primarily on small-scale laboratory experiments. The state of the art of the mathematical/numerical modeling of the scour processes is presented. The associated self-burial of the pipe is described and compared to field observations. In addition to scour, liquefaction may also constitute a risk for pipeline stability. The cause of liquefaction and the resulting consequence for pipeline stability in a natural environment are discuss...
72 citations
TL;DR: In this article, a flexible rubber plate was placed between the submarine pipeline and bed, while the rigid spoiler was attached to the top of the pipe to enhance the scour depth and extent.
Abstract: This paper presents results from laboratory experimental model studies investigating scour by waves around a pipeline attached to a flexible rubber plate or rigid spoiler. The rubber plate was placed between the submarine pipeline and bed, while the rigid spoiler is attached to the top of the pipe. The scour around pipelines with and without a rubber plate or a rigid spoiler under regular and irregular waves was observed and measured for a range of pipe sizes, wave amplitudes and frequencies, and the length of the plate/height of the spoiler. The experiments reveal that although the rigid spoilers can enhance the scour depth and extent (thus accelerating the self-burial of the pipe), they also have significant influence on both the upstream and downstream bed topography as sand ripples and dunes are formed. On the other hand, the rubber plates cannot only significantly increase the scour depth but also have little effect on the upstream and downstream bed. The experiments show that when the length of the plate is about 1.5 times the pipe size, it provides the optimum performance in terms of the largest scour depth while restricting the impact on nearby beds for the parameters investigated in this study.
31 citations
TL;DR: In this paper, the joint effect of solitary waves and background currents on the pipelines is numerically studied by using a numerical wave tank developed with a free surface tracking approach and the immersed boundary method.
30 citations
TL;DR: In this article, an experimental investigation of seabed evolution behavior around a submarine pipeline and the hydrodynamic forces on the pipeline under regular waves was presented. And the influence of bedform evolution on wave forces was found to vary significantly in different regimes.
28 citations