Study on Diffusion of Silt and Sand Contaminants in Shallow Coastal Area : On the Diffusivities of Settling Particles

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  • Momii Kazuro
    Laboratory of Civil Engineering, Faculty of Engineering
  • Tanaka Kohei
    Laboratory of Land-Drainage and Reclamation, Faculty of Agriculture, Kyushu University
  • Shikasho Shiomi
    Laboratory of Land-Drainage and Reclamation, Faculty of Agriculture, Kyushu University

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Other Title
  • 浅海域における土砂拡散に関する研究 : 沈降性粒子の拡散係数について
  • センカイイキ ニ オケル ドシャ カクサン ニ カンスル ケンキュウ チンコウ

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Abstract

This paper discusses the turbulent diffusivities of settling particles in a stationary turbulent field. A solution to the particle diffusivities is derived by the use of the equations of particle motion, the Eulerian spatial correlations approximated by exponential function and Taylor's diffusion theory. The present theory is applied to the analysis of experimental results or Snyder & Lumley (1971) for a grid-generated turbulence and of Calabrese & Middleman (1979) for the turbulent core region of a fully developed vertical pipe flow. The following results are obtained: (1) When the Eulerian spatial correlations, turbulent intensity and particle parameters are given, it is possible to evaluate the particle diffusivities through the present theory. (2) The theoretical results are in good agreements with the experimental results. (3) In isotropic turbulence, the particle diffusivities in the vertical direction are larger than those in the horizontal directions.

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