Title of article :
Particle size and sorting characteristics of sand in transport on the stoss slope of a small reversing dune
Author/Authors :
Lancaster، نويسنده , , N and Nickling، نويسنده , , W.G. and McKenna Neuman، نويسنده , , C، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2002
Pages :
10
From page :
233
To page :
242
Abstract :
Studies of the particle size and sorting characteristics of sand on the stoss slope of a 6-m high reversing dune show that the sand in transport is generally finer and better sorted than surface sand at the same position on the slope. The sand in transport becomes coarser and more poorly sorted as wind speed and rates of mass transport increase toward the dune crest. These patterns reflect changes in the competence of the wind, which is capable of transporting larger grains and a wider range of grain sizes as its speed increases in space and time. Our field observations suggest that the particle size and sorting characteristics of surface sand are highly dependent on antecedent wind conditions and are not an invariant property of the dune, as is widely assumed. The wide range of particle sizes on the surface, as well as its change through time, also has important implications for modeling sediment transport on dunes. Transport thresholds may vary by as much as 30% on the stoss slope of the study dune.
Keywords :
aeolian processes , Sand particle size and sorting
Journal title :
Geomorphology
Serial Year :
2002
Journal title :
Geomorphology
Record number :
2357677
Link To Document :
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