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2 results

  • 2 - Dune Morphology

  • from Part II - Dune Morphology and Sediments
  • Nicholas Lancaster
  • Book:
    Geomorphology of Desert Dunes
    Published online:
    03 March 2023
    Print publication:
    23 March 2023, pp 15-48

  • Summary

    Desert dunes occur in a variety of morphologic types, each of which displays a range of sizes (height, width, and spacing). This chapter discusses how they may be classified, describes the morphology of the major dune types, and briefly discusses the conditions of sand supply and wind regime in which they occur.

  • 6 - Dune Dynamics

  • from Part III - Dune Processes and Dynamics
  • Nicholas Lancaster
  • Book:
    Geomorphology of Desert Dunes
    Published online:
    03 March 2023
    Print publication:
    23 March 2023, pp 122-150

  • Summary

    Changes in the rate and direction of sand transport in space and time give rise to patterns of erosion and deposition on dunes on a range of timescales that range from individual transport events, through seasonal changes in wind direction, to decadal and longer periods of dune growth, migration, and extension. Flow acceleration results in erosion of windward or stoss slopes. Flow separation in the lee gives rise to avalanching and deposition of sand, leading to dune migration. These processes are manifested in different ways on dunes of differing types, indicating a series of interactions between dune topography and processes.