The Experts below are selected from a list of 4269 Experts worldwide ranked by ideXlab platform
W Magda - One of the best experts on this subject based on the ideXlab platform.
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wave induced cyclic pore pressure perturbation effects in hydrodynamic uplift force acting on Submarine Pipeline buried in seabed sediments
Coastal Engineering, 2000Co-Authors: W MagdaAbstract:Among all environmental loads usually considered in the design procedure, the most critical problem in determining a vertical stability of a Submarine Pipeline buried in permeable soils under progressive surface-water-wave loading is the prediction of the wave-induced cyclic pore-pressure response of a seabed in the vicinity of a Submarine Pipeline. A study of the hydrodynamic (i.e., wave-induced) uplift force acting on a Submarine Pipeline buried in sandy seabed sediments is presented, under the assumption of different compressibility models of the two-phase seabed/pore-fluid medium. Introducing an uplift-force perturbation ratio, the question of perturbation effects affecting the wave-induced pore-pressure field by the presence of a stiff and impermeable body of the Submarine Pipeline is analysed thoroughly.
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wave induced uplift force on a Submarine Pipeline buried in a compressible seabed
Ocean Engineering, 1997Co-Authors: W MagdaAbstract:Abstract A two-dimensional finite-element simulation of the wave-induced hydrodynamic uplift force acting on a Submarine Pipeline buried in sandy seabed sediments subject to continuous loading of sinusoidal surface waves is presented. Neglecting inertia forces, a linear-elastic stress-strain relationship for the soil and Darcy's law for the flow of pore fluid are assumed. The model takes into account the compressibility of both components (i.e., pore fluid and soil skeleton) of the two-phase medium. The results of numerical analysis are presented and discussed with respect to soil and pore fluid parameters where special attention is paid to the question of soil saturation conditions. The meaning of the results is also related to surface wave conditions. As a general conclusion, the practical, engineering recommendation is given in order to make a realistic, safe and economic estimation of the wave-induced uplift force acting on a buried Submarine Pipeline.
Xu Wen-bin - One of the best experts on this subject based on the ideXlab platform.
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Applications of DGPS Sounding Technique in Submarine Pipeline Engineering
Coastal Engineering, 2012Co-Authors: Xu Wen-binAbstract:The basic positioning principle of Differential Global Position System(DGPS) and the hardware components of DGPS sounding system are presented.This sounding technique has been applied in the Submarine Pipeline project in the Meizhou Bay of Fujian,leading to a great improvement in measuring accuracy and working efficiency.This practice has indicated that the DGPS sounding technique will be gradually adopted in the Submarine Pipeline engineering.However,it is a process of progressive and continuous completion and improvement.It is believed that in the future this technique must play a role for the Submarine Pipeline engineering in the coastal areas of China.
Zhou Qi-kun - One of the best experts on this subject based on the ideXlab platform.
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Correction and Inspection of Submarine Pipeline Span in the Chengdao Oil Field
Coastal Engineering, 2012Co-Authors: Zhou Qi-kunAbstract:The Pipeline span is a serious phenomenon in the Chengdao Oil Field.The correcting and inspecting techniques for the Submarine Pipeline span are introduced and three proposals have been suggested for checking the effects of correcting the Pipeline span.By taking a case in the Chengdao Oil Field,the anti-scouring bionic seaweed protection technology which has a certain effect for Submarine Pipeline span is presented.
Dong-sheng Jeng - One of the best experts on this subject based on the ideXlab platform.
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Numerical Modeling of Seismic-induced Soil Response Around Submarine Pipeline
The Open Civil Engineering Journal, 2012Co-Authors: X.-l. Zhang, Dong-sheng JengAbstract:Seismic-induced pore pressure and effective stresses in the saturated porous seabed under seismic loading are the main factors that govern the overall stability of Submarine Pipelines. In most of the previous investigations for the seismic-induced dynamic response around a Submarine Pipeline have been limited to two-dimension cases. In this paper, a three-dimensional finite element model including buried Pipeline is established by extending DYNE3WAC. Based on the numerical model presented, the effects of Pipeline geometry and soil characteristics on the seismic-induced pore pressure of the seabed and internal stresses of Submarine Pipeline will be discussed in detail.
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Numerical Modeling of Seismic-induced Soil Response Around Submarine Pipeline
The Open Civil Engineering Journal, 2012Co-Authors: X.-l. Zhang, Dong-sheng JengAbstract:Seismic-induced pore pressure and effective stresses in the saturated porous seabed under seismic loading are the main factors that govern the overall stability of Submarine Pipelines. In most of the previous investigations for the seismic-induced dynamic response around a Submarine Pipeline have been limited to two-dimension cases. In this paper, a three-dimensional finite element model including buried Pipeline is established by extending DYNE3WAC. Based on the numerical model presented, the effects of Pipeline geometry and soil characteristics on the seismic-induced pore pressure of the seabed and internal stresses of Submarine Pipeline will be discussed in detail.
M. R.m. Kushairi - One of the best experts on this subject based on the ideXlab platform.
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Some effects of Submarine Pipeline construction on the sessile zoobenthic community of Redang Island
Hydrobiologia, 1999Co-Authors: Hamid Rezai, H. M. Ibrahim, B. A.g. Idris, M. R.m. KushairiAbstract:A Submarine Pipeline, constructed in 1997–1998 to provide water to Redang Island, Malaysia traverses an area covered with corals. Biological studies were conducted before and following Pipeline construction to monitor the changes in the biota at selected sites. Benthic invertebrates (including corals) were used as monitoring tools. Student's t-test and one-way ANOVA macroinvertebrates in pre- and post-construction analyses revealed that there was no significant difference in total abundance of sessile periods. Student's t-test revealed that there was a significant difference in mean of live coral coverage during pre and post-construction periods. There was no apparent change in total numbers of macroinvertebrates. Our results suggest only short-term impacts and recovery of the benthic community.
