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2 results

  • 16 - Planetary Dune Systems

  • from Part VI - Dune Systems in Time and Space
  • Nicholas Lancaster
  • Book:
    Geomorphology of Desert Dunes
    Published online:
    03 March 2023
    Print publication:
    23 March 2023, pp 281-288

  • Summary

    Discovery of dune systems on other planetary bodies (Mars, Venus, Saturn’s moon Titan, and Pluto) have demonstrated the universal nature of the processes of aeolian sediment transport and bedform development despite a wide range of atmospheric properties and sediment composition. Current and future spacecraft missions, especially by landers and rovers, will provide further insights into planetary dune systems.

  • 8 - Controls of Dune Orientation

  • from Part IV - Boundary Conditions for Dune Formation and Development
  • Nicholas Lancaster
  • Book:
    Geomorphology of Desert Dunes
    Published online:
    03 March 2023
    Print publication:
    23 March 2023, pp 163-174

  • Summary

    The orientation or trend of dunes with respect to wind direction has long been a focus of dune research, especially for dunes that form in multidirectional wind regimes. The concepts of the gross bedform-normal transport (GBN) and the bed instability and fingering modes provide analytical solutions for understanding how dunes are oriented to sand-transporting winds and indicate the importance of sand supply for dune morphology in multidirectional wind regimes. They help to explain complex dune patterns and the existence of superimposed bedforms on megadunes.