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Available and Critical Shear Stress for Sediment Entrainment

  • Swapan Kumar MaityEmail author
  • Ramkrishna Maiti
Chapter
  • 167 Downloads
Part of the SpringerBriefs in Earth Sciences book series (BRIEFSEARTH)

Abstract

Causes and mechanisms of sedimentation are explained in connection to the seasonal fluctuation of shear stress. Available and Critical shear stress have been calculated following DuBoys and Shield formula. Critical shear stress of sediment entrainment varies from 0.031 to 0.147 N/m2 in pre-monsoon, 0.041 to 0.169 N/m2 in monsoon and 0.034 to 0.148 N/m2 in post-monsoon season. Available shear stress varies from 0.271 to 0.923 N/m2 in high tide and 0.014 to 0.683 N/m2 in low tide during pre-monsoon season. In monsoon, it varies from 0.275 to 0.965 N/m2 and 0.237 to 0.907 N/m2 during high tide and low tide respectively. It varies from 0.259 to 0.889 N/m2 and 0.022 to 0.521 N/m2 during high tide and low tide in post-monsoon. Lack of available energy to transport the sediment during low tide (in dry season) is the main reason behind the rapid sedimentation in this area. Most of the places (>75%) having deficiency of energy (available shear stress is lower than critical shear stress), during low tide are characterized by deposition of sediments. Presence of mud above the critical limit (30%) in some of the sediment samples generates the cohesive property, restricts sediment entrainment and invites sedimentation. Sheltering of fine grains by coarse grains, biological activity and organic content increase the critical shear stress of sediment entrainment and causes sedimentation.

Keywords

Sediment texture Available and critical shear stress Cohesive property Sedimentation 

References

  1. Ahmad MF, Dong P, Mamat M, Wan Nik WB, Mohd MH (2011) The critical shear stresses for sand and mud mixture. Appl Math Sci 5(2):53–71Google Scholar
  2. Bettes R (2008) Sediment transport and alluvial resistance in rivers. R&D Technical Report W5i 609, Environment Agency, Rio House, Waterside DriveGoogle Scholar
  3. Charlton R (2007) Fundamentals of fluvial geomorphology. Routledge, New York, NY, p 234Google Scholar
  4. Clayton J (2010) Local sorting, bend curvature, and particle mobility in meandering gravel bed rivers. Water Resour Res. 46.  https://doi.org/10.1029/2008WR007669
  5. Dey S (1999) Sediment threshold. Appl Math Model 23:399–417CrossRefGoogle Scholar
  6. Du Boys P (1879) Let Rhone et les Rivieres a Lit Affouillable. Annales des Ponts et Chaussees, Series 5(18):141–195Google Scholar
  7. Folk RL, Ward MC (1957) Brazos River bar (Texas): a study in the significance of grain size parameters. J Sediment Petrol 27(1):3–27CrossRefGoogle Scholar
  8. Friedman GM (1961) Distinction between dune, beach and river sands from their textural characteristics. J Sediment Petrol 31(4):514–529Google Scholar
  9. Hickin EJ (1995) River geomorphology. Wiley, New YorkGoogle Scholar
  10. Hjulstrom F (1935) Studies of the morphological activity of rivers as illustrated by the Rivers Fyris. Bull Geol Inst 25:221–527 University of UppsalaGoogle Scholar
  11. Knighton D (1998) Fluvial forms and processes: a new perspective. Arnold, London, p 383Google Scholar
  12. Maity SK (2015) Cognition of interworking of processes leading to sedimentation at lower reach of the Rupnarayan River, West Bengal, India. Dissertation, Vidyasagar University, West Bengal, IndiaGoogle Scholar
  13. Maity SK, Maiti RK (2017) Sedimentation under variable shear stress at lower reach of the Rupnarayan River, West Bengal, India. Water Sci 31:67–92Google Scholar
  14. Maity SK, Maiti RK (2018) Sedimentation in the Rupnarayan River: hydrodynamic processes under a tidal system. Springer Briefs in Earth Sciences. Springer, BerlinGoogle Scholar
  15. Mayoral H (2011) Particle Size, critical shear stress, and benthic invertebrate distribution and abundance in a Gravel-bed River of the Southern Appalachians. Geosciences Theses. Paper 31Google Scholar
  16. Mitchener H, Torfs H (1996) Erosion of mud/sand mixtures. J Coast Eng 29:1–25CrossRefGoogle Scholar
  17. Morisawa M (1985) Rivers: forms and process. Longman Inc, New YorkGoogle Scholar
  18. Paterson DM, Crawford RM, Little et al (1990) Sub-aerial exposure and changes in the stability of intertidal estuarine sediments. J Estuar Coast Shelf Sci. 30:541–546Google Scholar
  19. Shield ND (1936) Anwendung der ahnlickeit Mechanik under Turbulenzforschung auf die Geschiebelerwegung. Mitt. Preoss Versuchanstalt fur Wasserbau und Schiffbau, p 26Google Scholar
  20. Torfs H (1995) Erosion of sand/sand mixtures. Dissertation, Catholic University of Leuven, Leuven, BelgiumGoogle Scholar
  21. Van Ledden M (2003) Sand and mud segregation. Dissertation, Delft University of Technology, DelftGoogle Scholar
  22. Van Rijn LC (1993) Principles of sediment transport in rivers, estuaries and coastal areas. Aqua Publications, The NetherlandsGoogle Scholar
  23. Wiberg PL, Smith JD (1987) Calculations of the critical shear stress for motion of uniform and heterogeneous sediments. Water Resour Res 23(8):1471–1480.  https://doi.org/10.1029/WR023i008p01471 CrossRefGoogle Scholar
  24. Williamson HJ, Ockenden MC (1992) Tidal transport of mud/sand mixtures. Laboratory Tests HR Wallingford, Report SR, p 257Google Scholar

Copyright information

© The Author(s) 2018

Authors and Affiliations

  1. 1.Department of GeographyNayagram P.R.M. Government CollegeJhargramIndia
  2. 2.Department of Geography and Environment ManagementVidyasagar UniversityPaschim MedinipurIndia

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