...). In contrast, oscillatory liquefaction is associated with "phase lag" effects (Jeng, 2012), which refer to the phase and magnitude differences between the transient pore pressure within the seabed and the wave pressure acting on the seabed surface. geology geological subdiscipline scour hole...

... by the interaction between large-scale and small-scale eddies on the scour hole surface, which is the Reynolds stress with an expression of u w (4) where u and w represent the velocity fluctuations parallel and perpendicular to the flow direction, respectively, and the overbar denotes time-averaging...

... that both the depth and the width of the local scour hole around a winged monopile can be larger than those of a conventional monopile. Therefore, the wings need to be mounted below the scour hole to avoid the intensified scour effect that impedes the effectiveness of the wings. A series of numerical...

... natural language wind energy drill pipe selection platform design reservoir simulation scoured bed cfd model renewable energy scour morphology scour hole critical state friction angle criterion subsea system artificial intelligence upstream oil & gas calculation offshore wind turbine...

... be fully exposed after the sediment silting. The depth of the scour hole cannot reach the top of caisson when the buried depth is 4m or more. Introduction In the navigation area of shallow water depth, the protective facilities and subsea production system can be set below the seabed surface...

..., 2016). Zhao, Shi, Qu, Dong and Zhang (2018) investigate the local scour around submarine piggyback pipeline in the steady flow experimentally and numerically. It is found that as the inflow Re number increases, both maximum scour depth and the length of the scour hole increase at the same time. After...

... ABSTRACT The subsea structure layed on the seabed has effect on the current flow in the ocean engineering. The complex current flow disturbs sediment around the subsea structure and scour the structure foundation. If the depth of scour hole is too deep and makes the foundation have uneven...

... the energy dissipation effect of scour holes. In the experiments, overflow water rebounded upward by geogrids and a scour hole developed away from a coastal dike model. In the analyses, the scour hole behind the coastal model reduced the maximum horizontal flow velocity. INTRODUCTION The Great East Japan...

... inclined-pile group foundation wind turbine foundation scour depth subsea system scour renewable energy offshore wind turbine shear stress boundary flow pattern scour hole offshore projects planning and execution group foundation equation platform design local scour sediment seabed scour...

.... In the present study, flume experiments were conducted. The effective stress was controlled by upward seepage to reproduce liquefied ground. As a result, it is found that scour profile is influenced by the effective stress, and backfilling of the scour hole due to slope failure is observed at low effective...

... profiles were scanned through a three-dimensional scanner. The slope angle of the scour hole was extracted from the three-dimensional scan. equilibrium scour depth upstream oil & gas scour engineering vortex system finial scour profile oscillatory flow truncated pile scour profile...

... assessment scour mechanism scour depth scour hole span pipeline free-span observation scour-induced freespan close proximity touchdown length scour process pipeline freespan freespan span length offshore pipeline survey data theoretical touchdown length integrity pipeline...

... scour scour hole drilling fluid selection and formulation drilling fluid property experiment melville scour depth drilling fluids and materials bingham model upstream oil & gas scour problem three-dimensional simulation drilling fluid formulation traditional bingham model concentration...

... transport calculation friction velocity hydraulic experiment approx scour hole upstream oil & gas evolution turbulence equation nakamura Sediment Transport Calculation Considering Unresolved Scales of Turbulence and Its Application to Local Scouring due to Tsunami Run-Up Tomoaki Nakamura...

... and current. Hereby, local scour holes can be formed around monopiles. DNV (2010) and Sumer et al. (1992b) postulate that the depth of local scour holes can get up to 1.3 times the pile diameter. A scour hole with a depth of 1.3 times the pile diameter is in the following denoted a fully developed scour hole...

... on an erodible seabed are often suffering local scour. The local scour create scour hole underneath the pipeline, which make the pipeline suspended and facing the risk of fatigue damage due to vortex induced vibration. Understanding the scour processes is necessary for taking proper anti-scour measures. Many...

... monotonic design loads as well as large permanent deformations under cyclic lateral loads. reduction monopile diameter scour hole accumulation rate lateral deformation cyclic loading loading investigation scour effect scour depth lateral resistance rotation deformation response secant...

... to the bed, resulting in much larger dynamic and static scour holes than in previous laboratory experiments. Dynamic scour hole depth is found to be determined primarily by jet momentum flux with a very weak dependence on sediment size while scour hole diameter is determined both by jet momentum flux...

... sinks into the scour hole due to it's own weight. As the pipeline sinks into the scour hole, the flow field and the seabed shear stress around the pipe adjusts themselves accordingly. Up to a certain point, the scouring ceases and is replaced by the natural backfillinf of the trench. This completes...

... ABSTRACT A morphological model for the local scour around pipelines is developed. Based on the Navier-Stokes equation and an erodible boundary adjustment technique the model predicts the equilibrium scour hole without using any sediment transport formula. The calculation results clearly reveal...