Influence of Suspension Height on Pipeline Movement due to Submarine Debris Flow
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 10, Issue 4
Abstract
Deepwater pipelines are commonly found to be suspended above, freely laid on, and buried underneath the seafloor due to complex seabed geomorphology and surrounding hydrodynamic conditions. Under different suspension height, the pipeline may undergo distinct impact forces arising from the vertical velocity profile of submarine debris flow. As such, suspension height becomes one of the most critical parameters when estimating pipeline movement subject to debris flow impact. In this paper, the coupling model of submarine debris flow with pipeline interaction was further improved. The formula incorporating the effect of suspension height was used to estimate debris flow impact force on pipeline. The improved model was then applied to two schematized cases representing continental shelves with a uniform slope and a sinuous canyon. In each case, the flow structures of submarine debris flow were investigated, including total thickness, thickness of shear layer, depth-averaged velocity, and vertical velocity profile of debris flow. The influence of suspension height on pipeline movement due to debris flow impact was also analyzed. Moreover, sensitivity analyses were performed to study the effects of yield stress and initial failure height of debris flow on pipeline movement under different suspension heights.
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Acknowledgments
This research study was primarily supported by the US Army Research Office (Grant No. W911NF1310128) and Fugro Inc. (Grant No. 636567). Partial support was also provided by the Coastal Hazards Center of Excellence, and the Institute for Multimodal Transportation at Jackson State University, and is greatly appreciated.
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 10 • Issue 4 • November 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Dec 18, 2018
Accepted: Apr 10, 2019
Published online: Sep 12, 2019
Published in print: Nov 1, 2019
Discussion open until: Feb 12, 2020
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