Dual stratification of a sand pile formed by trapped kink

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  • Shimokawa Michiko
    Department of Earth System Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • Ohta Shonosuke
    Department of Environmental Fluid Science and Technology, Faculty of Engineering Sciences, Kyushu University

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Other Title
  • トラップドキンクによって形成される砂山の二重縞構造
  • トラップド キンク ニ ヨッテ ケイセイサレル スナヤマ ノ ニジュウ シマコウゾウ

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Abstract

We report on the experimental studies about a new dual stratification pattern and a trapped kink of a sand pile. When we pour a mixture of Large Rough grains (LRG) and Small Smooth grains (SSG) into a quasi-two dimensional Hele-Shaw cell, a stratification pattern of alternate LRG and SSG is formed spontaneously. In a formation of the stratification pattern, a congestion wave (kink) is observed. Ordinary, the kink is generated at the bottom of a sand pile and then the kink goes toward a top of the sand pile. In our experiment of a large sand pile, we found a new stratification pattern with two wavelengths. A wavelength is short in an upper region of the sand pile, while the other is long in the lower region. When the dual stratification is formed, the kink is generated not only at the bottom (ordinary kink) but also on the way of the sand pile slope (trapped kink). Both two kinks make the short wavelength of the upper region different from the ordinary stratification pattern. Therefore in our experiment of the large sand pile, the dual stratification is formed.

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