Particle size and sorting characteristics of sand in transport on the stoss slope of a small reversing dune

摘要: Studies of the particle size and sorting characteristics sand on stoss slope a 6-m high reversing dune show that in transport is generally finer better sorted than surface at same position slope. The becomes coarser more poorly as wind speed rates mass increase toward crest. These patterns reflect changes competence wind, which capable transporting larger grains wider range grain sizes its increases space time. Our field observations suggest are highly dependent antecedent conditions not an invariant property dune, widely assumed. wide surface, well change through time, also has important implications for modeling sediment dunes. Transport thresholds may vary by much 30% study dune.