DOI QR코드

DOI QR Code

A Case Study of Sediment Transport on the Seabed due to Wave and Current Velocities

  • Received : 2016.06.30
  • Accepted : 2016.08.27
  • Published : 2016.09.30

Abstract

Seabed affected by scouring, sedimentation, and siltation occurrences often cause exposure, which induces risks to existing structures or crude oil or gas pipeline buried subsea. In order to prevent possible risks, more economical structure installation methodology is proposed in this study by predicting and managing the risk. Also, the seabed does not only consist of sandy material, but clayey soil is also widespread, and the effect of undrained shear strength should be considered, and by cyclic environmental load, pore water pressure will occur in the seabed, which reduces shear strength and allows particles to move easily. Based on previous research regarding sedimentation or erosion, the average value of external environmental loads should be applied; for scouring, a 100-year period of environmental conditions should be applied. Also, sedimentation and erosion are mainly categorized by the bed load and suspended load; also, they are calculated as the sum of bed load and suspended load, which can be obtained from the movement of particles caused by sedimentation or erosion.

Keywords

References

  1. Abbas Moustafa,2012, "Advanced in Geotechnical Earthquake Engineering- Soil Liquefaction and Seismic Safety of Dan and Monuments",ISBN 978-953-0025-6, pp.65-80
  2. Acker, P. and White, W.R., 1973, "Sediment Transport : new approach and analysis", Journal of the Hydraulics Division, ASCE, 99(11), pp. 2041-2060.
  3. Acker, P.,1972, "Sediment Transport in Channels: An Alternative Approach", Report INT 102, Hydraulic Research Station, Wallingford, England.
  4. Bagnold, R.A., 1966, "An Approach to the sediment transport problem from general physics", U.S. Geological Survey Prof. Paper, pp. 422-I
  5. Bailard, J.A., 1981, "An Energetics total load sediment transport model for a plane sloping beach", Journal of Geophysical Research, Vol, pp.10938-10954
  6. Chih-Hsin Vhang, Leen-Kwei Chien and et al, 2004, "3-D Liquefaction Potential analysis of Seabed at nearshore Area", Journal of Marine Science and Technology, Vol.,12, No.3 pp.141-151.
  7. Daniel B. Chu, Jonathan P. Stewari, et al, 2008, "Cyclic Softening of Low-Plasticity Clay and Its Effect on Seismic Foundation Performance", Journal of Geotechnical and Environmental Engineering, pp.1595-1608
  8. EM 1110-2-1100(Part III), 2002, Sediment Transport outside the surf zone
  9. EM 1110-2-1100(PartIII), 2002, Longshore Sediment Transport
  10. FHWA NHI-05-042, 2006, "Design and Construction of Driven Pile Foundations" pp. 9-179
  11. Ken Been, Abdelfettah Fredj and George Comfort, 2011, "Pipeline strains in soft clay backfill subject to ice gouging" Journal of pipeline engineering, Vol.10, No.2, pp.91
  12. Lien-kwei Chien, C.H.Chang and et all,2003,"The Mechanism Analysis of Wave-induced Seabed Liquefaction", Proceeding of the thirteen International offshore and polar engineering conference, pp.445-452
  13. Madsen, O.S., 1994, "Spectral Wave-current bottom boundary layer flows", 24th International Conference Coastal Engineering Research Council/ASCE
  14. Recommended Practice DNV-RP-E303,2005, "Geotechnical design and installation of suction anchors in clay" pp.12-13
  15. Recommended Practice DNV-RP-F110,2007, "Global Buckling of Submarine Pipeline" pp.49.
  16. Scheffner, N.W., 1996, "Systematic analysis of long-term fate of disposed dredged material", Journal of waterway, port, coastal and Ocean Engineering, pp.127-133
  17. T.L.Youd and I.M. Idriss,2001,"Liquefaction Resistance of Soils: Summary Report from the 1996 NCEER and 1998 NCEER/NSF Workshop on Evaluation of Liquefaction Resistance of Soils", Journal of Geotechnical and Geo-environmental Engineering, pp297-313