砂丘骨格模型による3次元砂丘の動力学(流体数理(3),一般講演)

概要

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To theoretically analyze the stability of the shape and migration process of transverse dunes and barchans, we propose a skeleton model of three-dimensional (3D) dunes described with coupled dynamics of 2D cross sections (2D-CS). The model simply describes the essential dynamics of 3D dunes as a system of coupled ordinary differential equations. The numerical results indicate that i) The increase in the amount of available sand and the inter-2D-CS flow enhances the stability of the shape of transverse dune. ii) The decrease in the amount of available sand and the increase in the intra-2D-CS flow destabilizes its shape to enforce the deformation to a barchan. Moreover, the transition point between transverse dune and barchan is obtained by the linear stability analysis of two 2D-CSs system.
日本流体力学会の論文
2010-09-09