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Field Observations of Seabed Scours around a Submarine Pipeline on Cohesive Bed

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Advances in Computational Environment Science

Part of the book series: Advances in Intelligent and Soft Computing ((AINSC,volume 142))

Abstract

The seabed scours around a submarine pipeline on cohesive seabed were studied by analyzing the field investigation data of DF1-1 submarine pipeline off the west coast of Dongfang, Hainan Island. The results show that, the tidal current in the study area can cause the seabed scours on both sides of the pipeline (side scours). The maximum scour depths agree well with that calculated according to the formulae proposed by various researches based on experimental studies with sand or silt beds. It is found that the finer sediments were transported mainly in the form of suspended load in the scour process, while the coarser sediments were mainly as bedload. This process caused a noticeable coarsening process of the local sediments. There exists a large number of scour pits under the pipeline (down scours), which are believed to be caused by hurricanes, but the onset of the scour (piping) is a progressive process, and piping occurs only when the critical piping conditions are exceeded.

This work was supported by Natural Science Foundation of China (NSFC) Grant #41006024 to Jishang Xu and Grant #41030856 to Guangxue Li.

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Authors and Affiliations

  1. College of Marine Geo-Sciences, Ocean University of China, No. 238 Songling Rd., Qingdao, China

    Jishang Xu, Jinjing Pu & Guangxue Li

  2. Key Lab of Submarine Sciences and Exploration Technology, Education Ministry of China, No. 238 Songling Rd., Qingdao, China

    Jishang Xu & Guangxue Li

Authors
  1. Jishang Xu
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  2. Jinjing Pu
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  3. Guangxue Li
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Corresponding author

Correspondence to Jishang Xu .

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Editors and Affiliations

  1. Information Engineering Research Institu, Continental Dr 100, Newark, 19713, USA

    Gary Lee

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Xu, J., Pu, J., Li, G. (2012). Field Observations of Seabed Scours around a Submarine Pipeline on Cohesive Bed. In: Lee, G. (eds) Advances in Computational Environment Science. Advances in Intelligent and Soft Computing, vol 142. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27957-7_4

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  • DOI: https://doi.org/10.1007/978-3-642-27957-7_4

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-27956-0

  • Online ISBN: 978-3-642-27957-7

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