Sand, water and a rock in between : scour around gravity anchors astride pipelines

Xu Zhao

Sand, water and a rock in between : scour around gravity anchors astride pipelines

Xu Zhao

Research output: Thesis › Doctoral Thesis

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Abstract

[Truncated abstract] Gravity anchors (hereafter referred to as GAs) are arch-shaped or cable-clip-resembling precast concrete blocks placed at intervals astride subsea pipelines as an innovative and cost-effective secondary stabilisation strategy. Bottom-seated and free-settling on the seabed however, GAs can suffer from the undermining scour process (i.e. sediment erosion caused by the presence of structures themselves) around their base, resulting in their subsidence towards the pipe and thereby imposing integrity risks on pipeline operation. Scour around the specific subsea structure of GAs has been a very little researched area, and this thesis endeavours to make original contribution to knowledge with the following chapters. Note that each main-body chapter (2–5) adopts a paper format, and contains a literature review on the specific topic it deals with.

Original language	English
Qualification	Doctor of Philosophy
Publication status	Unpublished - 2014

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title = "Sand, water and a rock in between : scour around gravity anchors astride pipelines",

abstract = "[Truncated abstract] Gravity anchors (hereafter referred to as GAs) are arch-shaped or cable-clip-resembling precast concrete blocks placed at intervals astride subsea pipelines as an innovative and cost-effective secondary stabilisation strategy. Bottom-seated and free-settling on the seabed however, GAs can suffer from the undermining scour process (i.e. sediment erosion caused by the presence of structures themselves) around their base, resulting in their subsidence towards the pipe and thereby imposing integrity risks on pipeline operation. Scour around the specific subsea structure of GAs has been a very little researched area, and this thesis endeavours to make original contribution to knowledge with the following chapters. Note that each main-body chapter (2–5) adopts a paper format, and contains a literature review on the specific topic it deals with. ",

keywords = "Scour, Sediment transport, Gravity anchors, Pipelines, Bottom-seated subsea structures, Steady currents, Waves, Fluid-soil-structure interaction",

author = "Xu Zhao",

year = "2014",

language = "English",

}

TY - BOOK

T1 - Sand, water and a rock in between : scour around gravity anchors astride pipelines

AU - Zhao, Xu

PY - 2014

Y1 - 2014

N2 - [Truncated abstract] Gravity anchors (hereafter referred to as GAs) are arch-shaped or cable-clip-resembling precast concrete blocks placed at intervals astride subsea pipelines as an innovative and cost-effective secondary stabilisation strategy. Bottom-seated and free-settling on the seabed however, GAs can suffer from the undermining scour process (i.e. sediment erosion caused by the presence of structures themselves) around their base, resulting in their subsidence towards the pipe and thereby imposing integrity risks on pipeline operation. Scour around the specific subsea structure of GAs has been a very little researched area, and this thesis endeavours to make original contribution to knowledge with the following chapters. Note that each main-body chapter (2–5) adopts a paper format, and contains a literature review on the specific topic it deals with.

AB - [Truncated abstract] Gravity anchors (hereafter referred to as GAs) are arch-shaped or cable-clip-resembling precast concrete blocks placed at intervals astride subsea pipelines as an innovative and cost-effective secondary stabilisation strategy. Bottom-seated and free-settling on the seabed however, GAs can suffer from the undermining scour process (i.e. sediment erosion caused by the presence of structures themselves) around their base, resulting in their subsidence towards the pipe and thereby imposing integrity risks on pipeline operation. Scour around the specific subsea structure of GAs has been a very little researched area, and this thesis endeavours to make original contribution to knowledge with the following chapters. Note that each main-body chapter (2–5) adopts a paper format, and contains a literature review on the specific topic it deals with.

KW - Scour

KW - Sediment transport

KW - Gravity anchors

KW - Pipelines

KW - Bottom-seated subsea structures

KW - Steady currents

KW - Waves

KW - Fluid-soil-structure interaction

M3 - Doctoral Thesis

ER -

Sand, water and a rock in between : scour around gravity anchors astride pipelines

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