N. Endo et al., GRAIN-SIZE DISTRIBUTIONS OF SEDIMENT CARRIED BY SINGLE TRANSPORTATIONMODES IN AN EXPERIMENTAL MICRODELTA SYSTEM, Sedimentary geology, 102(3-4), 1996, pp. 297-304
Grain-size distributions of three sands in single transport-mode exper
iments after transport downstream from the brink of an experimental mi
crodelta, are neither gaussian nor log-hyperbolic. Instead, the sands
transported by avalanching and by suspension downstream of the microde
lta derive many of their grain-size attributes from those of the sand
fed into the flume at its upstream end. Relationships between the grai
n-size distributions of individual transport modes and the texture of
the 'original sand' are best demonstrated by normalizing the data to t
he grain size of the 'original sand'. The experimental data suggest th
at the suspension process does not prefer a peculiar size among the gr
ains which can be suspended; i.e., grains present in the suspended loa
d are represented in the same proportion as in the 'original sand'. Av
alanching and saltating sands, however, show modified size distributio
ns, even over short distances.