  A simple model for the dynamics of dunes associated with vegetation is
proposed. Using the model, formation processes of transverse dunes, parabolic
dunes and elongated parabolic dunes according to two environmental factors:
i)the amount of sand at the source, ii)the wind force, are simulated. The
results have qualitative correspondence to the real counterpart, and the
simplicity of the algorithm and the consequent easiness of the handling of this
model provide us with wide applicability for the investigation of the complex
interplay between vegetation and dunes.
