Аннотация
Vegetation greatly affects the formation and dynamics of dune fields in
coastal areas. In the present work, we use dune modeling in order to
investigate the genesis and early development stages of coastal dune
fields in the presence of vegetation. The model, which consists of a set
of coupled equations for the turbulent wind field over the landscape,
the saltation flux and the growth of vegetation cover on the surface, is
applied to calculate the evolution of a sand patch placed upwind of a
vegetated terrain and submitted to unidirectional wind and constant sand
influx. Different dune morphologies are obtained, depending on the
characteristic rate of vegetation growth relative to wind strength:
barchans, transverse dunes with trailing ridges, parabolic dunes and
vegetated, alongshore sand barriers or foredunes. The existence of a
vegetation-free backshore is found to be important for the nucleation
timescale of coastal dune generations. The role of the sand influx and
of the maximum vegetation cover density for the dune shape is also
discussed. (C) 2011 Elsevier B.V. All rights reserved.
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