Physics – Geophysics
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3406405b&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 6, CiteID L06405
Physics
Geophysics
19
Biogeosciences: Ecosystems, Structure And Dynamics (4815), Global Change: Earth System Modeling (1225), Global Change: Geomorphology And Weathering (0790, 1824, 1825, 1826, 1886), Nonlinear Geophysics: Self-Organization
Scientific paper
This letter presents a self-organising cellular automaton model capable of simulating the evolution of vegetated dunes with multiple types of plant response in the environment. It can successfully replicate hairpin, or long-walled, parabolic dunes with trailing ridges as well as nebkha dunes with distinctive deposition tails. Quantification of simulated landscapes with eco-geomorphic state variables and subsequent cluster analysis and PCA yields a phase diagram of different types of coastal dunes developing from blow-outs as a function of vegetation vitality. This diagram indicates the potential sensitivity of dormant dune fields to reactivation under declining vegetation vitality, e.g. due to climatic changes. Nebkha simulations with different grid resolutions demonstrate that the interaction between the (abiotic) geomorphic processes and the biological vegetation component (life) introduces a characteristic length scale on the resultant landforms that breaks the typical self-similar scaling of (un-vegetated) bare-sand dunes.
Baas Andreas C. W.
Nield J. M.
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