Pattern Formation of River Landscape

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  • Saeki Ayumi
    Department of Earth System Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • Okamura Makoto
    Fundamental Mechanics, Research Institute for Applied Mechanics, Kyushu University

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Other Title
  • 河川による地形のパターン形成
  • カセン ニ ヨル チケイ ノ パターン ケイセイ

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Abstract

Landscape evolution involves many complex processes related to the fluid motion, granular materials, vegetation and so on. Furthermore, its dynamics covers a wide range of length and time scales. Therefore, almost all models tend to rely on empirical formulas. We now propose a more principled model using shallow water equations combined with mass conservation of sediment. In our simulations, we show that a sheet flow forms the stripe pattern called a gully, not the channel network, and that a channel without banks builds the banks on both sides.

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