Barchan swarm dynamics from a Two-Flank Agent-Based Model
Abstract. We perform simulations of barchan swarms using the Two-Flank Agent-Based model investigating the effects of changing the angular separation between primary and secondary modes of wind, the density at which new dunes are injected, and the parameter qshift which controls the rate at which sediment is reorganised to restore symmetry in an asymmetric dune. Unlike previous agent-based models, we are able to produce longitudinally homogeneous size distributions and, for sparse swarms, steady longitudinal number density. We are able to constrain qshift by comparing the range of values for which longitudinally stability is observed with the range of values for which the width of asymmetry distributions is consistent with real-world swarms. Furthermore, we demonstrate dune size, asymmetry, dune density, spatial alignment, and collision dynamics are all strongly influenced by the angular separation of bimodal winds.
Model code and software
DTRobson/TwoFlankABModel: TwoFlankBarchanABMv2 https://doi.org/10.5281/zenodo.10252816
Barchan Swarm Simulations Using the Two-Flank Agent-Based Model https://doi.org/10.5281/zenodo.10252764
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