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Estimation of Retained Rate in Open-water Sediment Disposal

개방수역 퇴적물 처리에서 유보율의 평가

  • Received : 2015.11.03
  • Accepted : 2015.11.23
  • Published : 2015.11.30

Abstract

Open-water sediment disposal has many applications in costal construction. Dumping of sediment in open water can be divided into descending stage under water and sedimentation stage on the seabed, and retained rate is evaluated from analyzed results of these two successive stages. Descending particle cloud have two distinct thermal and swam phase, and trajectory equations for each phase are derived to describe settling velocity and radius of particle cloud. For sedimentation stage, a numerical simulator is used to calculate growth factors for particle fiction angle and current velocity. Retained rate is defined as a mass rate of remained sediment inside the circle which has a center at dumping point on the sea level and user-defined effective radius. Retained rate map for Singapore coast is presented with water depth of 20 m, current velocity of 0.0~1.5 m/s, and effective radius of 5 m. It will decrease sediment mass loss during disposal operation and minimize surrounding environmental pollution.

Keywords

Open-water sediment disposal;Particle cloud;Sedimentation;Retained rate

References

  1. Bhuiyan, F., Rajaratnam, N., and Zhu, D.Z. (2010), "An Experimental Study of Mounds Formed by Dumping Coarse Sediment in Channel Flow", Journal of Hydraulic Research, Vol.48, No.3, pp.283-291. https://doi.org/10.1080/00221681003726205
  2. Buhler, J. and Papantoniou, D.A. (1991), "Swarms of Coarse Particles Falling through a Fluid", In: Lee, J.H.W., Cheung, H.Y. (Eds.), Environmental Hydraulics. Balkema, Rotterdam, pp.135-140.
  3. Bush, J.W.M., Thurber, B.A., and Blanchette, F. (2003), "Particle Clouds in Homogeneous and Stratified Environments", J. Fluid Mech., Vol.489, pp.29-54. https://doi.org/10.1017/S0022112003005160
  4. Gensheimer, R.J. (2008), Dynamics of Particle Clouds in Ambient Currents with Application to Open-water Sediment Disposal, Massachusetts Institute of Technology, Cambridge, MA, p.259.
  5. Gensheimer, R.J., Adams, E.E., and Law, A.W.K. (2013), "Dynamics of Particle Clouds in Ambient Currents with Application to Open Water Sediment Disposal", J. Hydraul Eng., ASCE, Vol.139, No.2, pp.114-123. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000659
  6. Gu, J., Huang, J., and Li, C.W. (2008), "Experimental Study on Instantaneous Discharge of Unsorted Particle Cloud in Cross-flow", Journal of Hydrodynamics, Vol.20, No.1, pp.10-16. https://doi.org/10.1016/S1001-6058(08)60021-9
  7. Hallworth, M.A., Hogg, A.J., and Huppert, H.E. (1998), "Effects of External Flow on Compositional and Particle Gravity Currents", J. Fluid Mech., Vol.359, pp.109-142. https://doi.org/10.1017/S0022112097008409
  8. Montgomery, R.L. and Engler, R.M. (1986), "Fate of Dredged Material during Openwater Disposal", Environmental Effects of Dredging Technical Notes, Technical Report EEDP-01-2, U.S. Army Engineer Waterways Experiment Station, Vicksburg.
  9. Noh, Y. (2000), "Sedimentation of a Particle Cloud Across a Density Interface", Fluid Dyn. Res., Vol.27, pp.129-142. https://doi.org/10.1016/S0169-5983(99)00046-5
  10. Noh, Y. and Fernando, H.J.S. (1993), "The Transition in the Sedimentation Pattern of a Particle Cloud", Phys. Fluids A, Vol.5, pp.3049-3055. https://doi.org/10.1063/1.858715
  11. Rahimipour, H. and Wilkinson, D. (1992), "Dynamic Behavior of Particle Clouds", Proc. 11th Australasian Fluid Mechanics Conf. University of Tasmania, Hobart, Australia, pp.743-746.
  12. Ruggaber, G.J. (2000), The dynamics of particle clouds related to open-water sediment disposal, PhD thesis, Massachusetts Institute of Technology, Cambridge, MA, p.241.
  13. Shin, H. (2014), "FEM Numerical Formulation for Debris Flow", Journal of the Korean Geotechnical Society, Vol.30, No.10, pp.55-65.
  14. Soo, S.L. (1990), Multiphase Fluid Dynamics, Butterworth-Heinemann, p.696.
  15. Tropea, C., Yarin, A.L., and Foss, J.F. (2007), Handbook of Experimental Fluid Mechanics, p.557.
  16. Zhao, B., Law, A.W.K., Adams, E.E., and Er. J.W. (2014), "Formation of Particle Clouds", Journal of Fluid Mechanics, Vol.746, pp. 193-213. https://doi.org/10.1017/jfm.2014.121

Acknowledgement

Supported by : 삼성물산(주)